Synology jumbo frames best practice

2GbE. But as a best practice I was adviced that jumbo frame traffic be kept on separate vlan. Your virtual network must also be configured to support jumbo frames, this includes virtual switches. The Synology DS1812+ feels really solid when you unpack it. This usually refers to jumbo frames on Ethernet media. Therefore, Dell EMC recommends spreading Flash drives across all available buses, if possible, to ensure the best IOPS and service times. This ultimately decreases the load on your switch allowing it to work for efficiently. Windows: Open “Settings” → go to “Network & Internet” → click “Change your adapter options” → right click on the Thunderbolt 3 Ethernet adapter and click “Properties” → click “Configure…” → go to the “Advanced” tab → select “Jumbo Frame” and set the value to “9KB MTU”. The standard frame size is 1500; while there is no "standard" Jumbo size, it's usually about 9000 so it can handle an 8k data block (magic size - what a coincidence!) plus the overhead. I was pinging with -l 8000 -f which means send jumbo packets and don't The Gigabit switch is dumb so there is no LACP/Dynamic Link Aggregation though Jumbo frames are set up on both ends, all NICs. The maximum size of frames is called the Maximum Transmission Unit (MTU). And Yes, you should have an isolated storage network from your normal business network traffic. 7606 max mtu is 9216 & GSR is 9180. Why would I be even able to ping the the management interface with that size--especially if jumbo frames are not enabled. It varies in between 66 and 80 but mostly stays on the higher side. 5″ hard drive design, comes with Synology Disk Station Manager 2. 2 Use 10 Gb I/O module • The NAS data is presented to clients by the Data Movers. 11TB of space total. . When a network device gets a frame that is larger than its MTU, the data is either fragmented into smaller frames, or dropped. To test the jumbo frame feature, we need to enable it on your network adapter via the steps below: 1. If I switch to the regular packet size everything goes back to normal. Synology provide two different methods of 1. Eventually I discovered that the host's internal TAP netwok devices also need to be set to 9000. do not use them, you will most likely experience a loss in performance. I run a similar setup - with 2 10GbE links on the DS1821+, using NFSv4. the switch itself (LAN) will enable to support jumbo. If Jumbo Frames are enabled and your other client machines, routers, switches etc. Right-click the adapter for which you want to enable jumbo frames and select Properties. 5in disks, which are available in higher capacities at Key Point #2: Switches that don't support jumbo frames will drop jumbo frames. That is why i tried to find best practise (if any) how to config this. 1. Notwithstanding this fact, Synology’s products, including top-end ones like the DS509+ I am going to talk about in this review, compete successfully with their opponents. A document claims that Jumbo frames can only be used on Full Duplex Ethernet connections. level 1. Jumbo frames allow you to send larger data packets between your computer and your NAS. thanks, --mazlan. You need to make sure your switches support Jumbo Frames but anything recent/in an enterprise should. Enabling jumbo frames changes the MTU from 1514 bytes to something larger. So I’ve dome some scratching on that itch and not got very many satisfactory answers. ZyXEL XS1920 10 GbE Smart Managed Switch. If you would like to browse more quickly, you can tick the Transmit low-resolution images instead of the original images checkbox under the Main Menu > Media If it is only connected to a single server, make a direct connection without a switch. Enabling jumbo frames on a physical switch varies by manufacturer so you’ll need to consult their documentation to change that. I. Switch to SMB3 and enable Jumbo frames (also on your switch and pc and only if you are connected via cable). So its of little use normally. are some of the guidelines or restrictions: All the ports in a port-channel must have the same MTU. Ensure that your NIC or LOM supports Jumbo Frames. The default MSS value of any TCP profile is 1460. The following. Sometimes the network is very very slow or doesn’t work at all. Some are The reason i want to disable jumbo frames, is because if i have it enable, my media player, when playing files from the NAS that have a high bitrate, it starts to stuttering and loose frames. 05-27-2007 06:13 PM. In this case MTU (Maximum Transmission Unit) is 1500 bytes. the Synology Storage array to prevent single switch failure that can cause an outage to the virtual infrastructure. The new DS411j accepts 3. A place to answer all your Synology questions. While this does a good job of balancing application network traffic between network clients and servers, while host to storage communication tends to be measured in Kilobytes. Before proceeding with any iSCSI configuration, it would be prudent to ensure you have connectivity between your hosts and your storage box. Ask a question or start a discussion now. ATIH 2016 I have experimented with Jumbo frames (9000 bytes) I've enabled it on my new Cicso L2 switch aswell on the L3 Switch in the other room where my "NAS" (Windows 10 PC with SMB shares) is located. So they can be mixed w/o an issue. Cat5000> (enable) show port jumbo Jumbo frames enabled on port(s) 6/1-2,7/1-8. Set NAS and server both to jumbo frames to make large transfers a bit faster. So if you ESX v4 servers aren't configured for Jumbo Frames it won't change anything. This post describes the impact of Jumbo Frames (MTU) on the overall average of write, rewrite, read and reread performance (MBps): 28,1MBps @ MTU1500. Once I setup the Macs with jumbo frames I cannot connect to 1819+ at all. 3 Hot spares Note that dynamic pools do not require dedicated hot spares. 5, these NICs are supported: Intel (82546, 82571) Broadcom (5708, 5706, 5709, 57710, 57711) Netxen (NXB-10GXxR, NXB-10GCX4) Table 1 shows the benchmarked throughput results for jumbo frames with single and multiple RXQs in RHOSP 16. While discussing best practices and actual implementation of those practices, we came up with a question: The assumption is that ESX communicates with the VMDK on the SAN over the iSCSI connection, utilizing jumbo frames to maximize through put and performance. I've spend the day trying to understand why I couldn't get two Debian Linux guests, running as guests, to speak to each other when all the network devices were configured with 9000 mtu jumbo frames. Changing the MTU of a port-channel interface changes the MTU of all. This cuts down on the SMB overhead especially for 10 gbe networks! Thi Jumbo frames let ESXi hosts send larger frames out onto the physical network. To enable Jumbo Frames, first ensure that the switch ports have the MTU set to 9000 and every network hop between those hosts and the Cohesity cluster also have the MTU set to 9000. Port channeling: Channeling ports need to have the same jumbo frame setting on each port. e. The individual virtual NIC must have jumbo frames enabled. It features snap-in 2. I have the 1819+ with a 10Gigabit card a Mikrotik CRS305-1G-4S+IN switch and two iMac Pros with 10Gbps ethernet connection. For experimental support of Jumbo Frames in ESX 3. If you would like to browse more quickly, you can tick the Transmit low-resolution images instead of the original images checkbox under the Main Menu > Media Also make sure the switch that connects your servers to the NAS also supports jumbo frames. I also Jumbo frames. For Jumbo Frame Support. The best Jumbo frame size will depend on your file transfer protocol (SMB, NFS, FTP, etc) and network settings in the PC and NAS. Jumbo frames let ESXi hosts send larger frames out onto the physical network. “Green, Quiet and Reliable” – this is the slogan for the new Synology Disk Station DS409slim that is designed to provide users with a budget-friendly solution for easy file sharing and backup. First, check each router, switch, and any other network specific device on your network. 3 standard. Since I have a trunk running to another switch I had to change the port channel setting MTU too. Request a Product Feature To request a new product feature or to provide feedback on a StarWind product, please email to our support at support@starwind. DSM7 - OpenVSwitch and Jumbo Frames. Most of our testing on SmallNetBuilder is done using 4k jumbo frames because that's what works best with our computers and their 32 bit PCI NICs. After enabling jumbo frames it’s important to test connectivity between all devices. An end-to-end configuration of jumbo frames is required to take advantage of this technology. The reason for the performance increase, in this case, seems to be this: The use of Jumbo Frames simply requires less work for the server. I stood up my VM and then I got an alert. And then I learned! Adjusting the Jumbo Frames size might affect Media Server's DLNA service. 07-29-2009 01:52 AM. Synology DS1815+ -- DSM 5. To summarize this general best practice guide, you should NOT enable jumbo frame feature as a general home user. I have looked there and everywhere also on the settings of the router, and I cannot find a way to enable jumbo TomPBuffalo, the reason we use Jumbo frames is to send larger packets thus reducing the amount of packets sent to the switches. iSCSI SAN advice /best practice for a newbie -Synology / Win2k12. This frame Jumbo Frames is an advanced networking option that should only be enabled if the network architecture has been configured to work them specifically. Note: To make sure the email notifications are delivered correctly through the SMTP server, a valid DNS server IP should be entered. Sometimes data and connections work perfectly. Jumbo Frames introduces the ability for an Ethernet frame to exceed its IEEE 802 specified Maximum Transfer Unit of 1500 bytes up to a maximum of 9000 bytes. There were no changes to jumbo frame support in Windows Server 2012 R2. 1 multi-pathing, I can benchmark 2. We have some storage equipment that our server teams have set for jumbo frames in storage. · 6y. This frame Adjusting the Jumbo Frames size might affect Media Server's DLNA service. (MTU of 9000 bytes) Note: The entire network infrastructure must also support jumbo frames. If you are experiencing difficulties with DLNA service, please try changing the Jumbo Frames size back to default. Adjusting the Jumbo Frames size might affect Media Server's DLNA service. 1. The Manual states to enable Jumbo Frames got to: Network Center / Internet and there should be a drop down to enable it under the primary connection section. 5, these NICs are supported: Intel (82546, 82571) Broadcom (5708, 5706, 5709, 57710, 57711) Netxen (NXB-10GXxR, NXB-10GCX4) In basic terms, a jumbo frame is any frame larger than a standard Ethernet frame. In Windows Server 2016 there is a new offload: MTU Enable Jumbo Frames (MTU) of switch and check that it is enabled on all network interfaces that are presented to StarWind. This space is to be primarily used for file storage. A tell-tale sign of jumbo frame issues is intermittent problems. I have all my interfaces have their MTU set to 9000. Jumbo frames is a NIC and network feature that allows an application to send frames that are much larger than the default 1500 bytes. Jumbo frames can transfer large files more efficiently than it is possible with the standard IP MTU size of 1500 bytes. 5” drives the other for 3. 3. VMware supports jumbo frames with the following NICs: Intel (82546, 82571), Broadcom (5708, 5706, 5709), Netxen (NXB-10GXxR, NXB-10GCX4), and Neterion (Xframe, Xframe II, Xframe E). But, the Jumbo Frame Conclusions. you can disable JF on the vSwitch and even if the VMK ports are configured for JF, it won't be negotiated. Synology DiskStation DS411j review. If you would like to browse more quickly, you can tick the Transmit low-resolution images instead of the original images checkbox under the Main Menu > Media Make sure you have (minimally) SMB2 enabled and make sure you have Jumbo Frames (large MTU) setup. I've got it set up using the SHR (Synology Hybrid Raid) feature, netting us about 8. 92% of the time was spent in allocating Jumbo-sized frames through e1000_alloc_jumbo_rx_buffers in the MBU 9000 test, versus 21% of the time required in the MTU 1500 test for e1000_alloc_rx_buffers. Ethernet MTU stands for Maximum Transmission Unit, the largest data payload in an Ethernet frame. For end to end support, each device in the network needs to support Jumbo frames including the NIC and Ethernet switches. VMM guests and jumbo frames. The switch will only add a point of possible failure. This post if for getting best SMB (Windows share) thruput without screwing other protocols. A Jumbo Frame is any TCP/IP packet that exceeds the base size of 1514 bytes. Here are the speeds I got with 6 x 12TB WD Reds in RAID 5 with no Synology makes a range of four-disk network attached storage enclosures, but many can only take 2. All devices connected through iSCSI need to support 9k jumbo frames. • For high-performance workloads, it is recommended to use 10 Gb I/O modules and jumbo frames. Jer_Cough. theoldwizard1 wrote: I am looking for "best practices" for network setup. Although this feature can deliver additional throughput by increasing the size of the payload in each frame from a default MTU of 1,500 to an MTU of 9,000, great care and consideration must be used if you decide to implement it. Their main value is that they can dramatically improve network performance by raising effective bandwidth. Connected I just checked and both our Synology devices have Jumbo Frames disabled by default, and even when you enable it, it defaults to an MTU of 2000. An Ethernet packet larger than 1500 bytes is called a jumbo frame. When setting the jumbo frame, the frame of the device in the network must be less than or equal to the frame of the computer, otherwise it will cause a serious degradation of performance. Make sure that it supports Jumbo Frames. 2-5565 Update 1 Jumbo Frame: 9000 . The MTU size is increased to 9216 bytes when the jumbo frame Following are the consideration and configuring Jumbo frames can be. Fragmentation, which can occur in routers, as I'll discuss below, is a Layer 3 function. All devices sitting in the I/O path must be able to implement jumbo frames for this to I just checked and both our Synology devices have Jumbo Frames disabled by default, and even when you enable it, it defaults to an MTU of 2000. Nexus 93180YC and Jumbo Frames. Glw support. 154. Form HPE Manual msa 2040 best practices Jumbo frames: A normal Ethernet frame can contain 1500 bytes whereas a jumbo frame can contain a maximum of 9000 bytes for larger data transfers. The network must support jumbo frames end-to-end that includes physical network adapters, physical switches, and storage devices. Step 2: Netgear – Create LAG, set VLAN and Jumbo Frames on the LAG. Synology DS1621+ – Jumbo frames enabled on NET5 interface. best practice for create volume moonwalker0921. The standard is 1500 bytes. 9 Dell EMC PowerMax and VMAX All Flash: eNAS Best Practices | H15188. Some switches have limited buffer sizes and can only support Flow Control or Jumbo Frames, but not both at the same time. Jumbo frames. The key to using jumbo frames is to make sure all the “hoops” can pass the largest ball (frame) you intend to use. I then direct-connected the NAS to my Macbook Pro and got faster speeds with jumbo frames. This larger frame size reduces the overhead on both your servers and iSCSI targets. So yes, please use Jumbo frames. When we need jumbo frames across a layer-3 interface (Router), in this case, the USG, we need to enable a higher MTU size than 1500 on the specific interfaces. I'd Like to enable Jumbo Frame on the 4 port switch on the RT2400AC router. The MSA reserves some of this frame size; the current maximum frame size is 1400 for a normal frame and 8900 for a jumbo frame. Note that the MTU is not the frame size, an Ethernet frame has L2 header (SMAC (LACP and Jumbo frames support) As you can see, we use a pretty strong test system with an ultra-fast PCIe SSD from which all the tests are executed to make sure there is no bottleneck on our side, since the RevoDrive 350 480 GB can achieve up to 1800 MB/s read and 1700 MB/s write speeds (sequential). Yes, you are correct. Click Change adapter settings. It’s not useful at all for traffic crossing the Internet and most regular LAN traffic doesn’t benefit much from it either. It’s most commonly used for iSCSI connections, but can also help a bit with SMB 3 and Live Migration traffic. This article also does not cover changing non-Windows virtual machines. To allow an ESX host to send larger frames out onto the physical network, the network must support Jumbo Frames end to end. If Jumbo Frames are used, you must set the correct MTU size end-to-end, including the ESX server VMkernel ports for iSCSI traffic, any physical switch ports to which the VMkernel NICs are connected, and the Synology iSCSI interfaces. In other words; I would advise to test the actual impact of Jumbo Frames on performance. Since there is no possibility in the UI we need to do this via the CLI. Open control panel and go to Network and Sharing Center. Also try those values + 50. But because we (LACP and Jumbo frames support) As you can see, we use a pretty strong test system with an ultra-fast PCIe SSD from which all the tests are executed to make sure there is no bottleneck on our side, since the RevoDrive 350 480 GB can achieve up to 1800 MB/s read and 1700 MB/s write speeds (sequential). The configuration on our switchesis done via the system setting 'system jumbo mtu 9216 '. The appliance receives data as jumbo frames and sends it as jumbo frames. Hi! Come and join us at Synology Community. Pings seem to work. Jumbo frames were created to better handle the flow of iSCSI SAN If you’ve forgotten to enable jumbo frames/9k MTU on your client device you’re sending the ping from you’ll see: PING xxx. 27,6MBps @ MTU4088. 25,5MBps @ MTU9014. when I implemented Jumbo frames, i had to implement MTU changes at both the VLAN level as well as port level. Physical switch – Jumbo frames enabled globally. Jumbo frames were proposed by Alteon in 1998 and later Alteon was acquired by Nortel Networks who produced the first devices to support Jumbo frames. Try MTU size of 4216, 5535 and 8312. You get a UK power lead, two bags of screws (one set for 2. Let me know if you have any other questions and I will help you with Best Practices. CLI procedures To allow an ESX host to send larger frames out onto the physical network, the network must support Jumbo Frames end to end. Here are the speeds I got with 6 x 12TB WD Reds in RAID 5 with no If you try to disable the jumbo frame feature on a trunk port, the port still passes jumbo frames until you turn off trunking. The gains are trivially small and the risk of performance problems is high. However, support for jumbo frame sizes varies among software, NIC, and switch vendors. Hello, I'm using a Shuttle pc with an Amd dualcore Athlon ( 4450E ) and 2 GB DDR 2 memory The internal drive is a 64 GB SSD Everything here is On a Gigabit network, My router i a Asus RT-AC68U On my shuttle is have a external HDD box with 2 drives in JBOD a 2 TB and a 3 Tb drive. Even though Jumbo Frames is widely available in most NICs and data-center class managed switches it is not an IEEE approved standard. I believe there is a best practices PDF in the doc section of their support site. Nov 29, 2008. Remember, ALL devices involved in the connection need to support Jumbo Frames for it to work, otherwise the packets will get fragmented and performance degraded, which sounds like is happening to you. The process of setting up your network comes down to changing the MTU setting on every device to 9000 bytes, instead of the default 1500 bytes. xxx (xxx. A Citrix ADC appliance can use jumbo frames in the following deployment scenarios: Jumbo to Jumbo. We use Broadcom NetXtreme II BCM5708 and Intel 82571EB, so Jumbo Frames implementation is not going to be a problem. Non-Jumbo to Jumbo. This leads us to another key point: Key Point #3: For a jumbo packet to pass through a router, both the ingress and egress interfaces must support the larger packet size. Support for Jumbo Frames Ethernet frames that transport data are typically 1,500 Bytes in size. Typically the limit on jumbo frames is about 9000 bytes but may be smaller. Is this true from Synology perspective? Best practice on Jumbo frames Mijaki. For better or worse, as a standard practice we've been enabling jumbo frames in our data centers on our layer 2 links. What is jumbo frame? In computer networking, jumbo frames or jumbos are Ethernet frames with more than 1500 bytes of payload, the limit set by the IEEE 802. Also make sure the switch that connects your servers to the NAS also supports jumbo frames. 2 and offers excellent functionality. The default Maximum Transmission Unit (MTU) frame size is 1548 bytes for all Ethernet ports. 5”) two LAN cables (not snagless) and two funky hexagonal keys to lock the Seagate Barracuda 3TB drive caddies in place plus a manual and CD with software. Advertisement. File-read packets from Synology to Client Size: most are 9014 bytes (in both directions) IP Flags: Don't fragment If you try to disable the jumbo frame feature on a trunk port, the port still passes jumbo frames until you turn off trunking. I re-connected with the 1G port and switched the Jumbo Frames off and everything was back to normal. If a mixed jumbo/standard environment is required (which is probably the case for any SOHO network), then you need to start looking at VLANs, as they provide the proper segmentation required for such a configuration. If you want to enable Jumbo Frames, you can do it. 0 Helpful. All devices used to connect iSCSI devices need to support it. That 13 hour time diff is a btch and you're gonna get a lot of one-line questions asking for info you probably answered already. enabled on interfaces configured for port-channel protocols. The easiest way to test is using the ping command. In Windows Server 2016 there is a new offload: MTU Jumbo Frames are negotiated on a per session basis. In addition to scaled RX queues, other optimization considerations are mentioned in Learnings and Best-Known Practices. com and put “Request a Product Feature” as the subject. Nov 25, 2012. Best case, have them run on different hardware, but if you can't then separate VLANs are fine. Step 1: Synology – Create bond, set IP and Jumbo Frames on the bond . 5 3. Jumbo Frames (spec sheets): 9KB (their website says 15KB but it looks like a different device) Server. We're looking to expand out storage capabilites and have acquired a SYNOLOGY DS1812+ with 5 3TB hdds mounted. If round robin is implemented, we can force hops between paths every 8800 bytes Note that 16. Jumbo Frames are Ethernet frames with more than the standard 1500 bytes of Maximum Transmission Unit (MTU), allowing Ethernet transmission of large files to be more efficient. I think the problem is with jumbo frames, because if i connect the freenas to a 100Mbps port, i don't have this problem anymore. The routers in the middle are 7606, some GSR12008. File-read packets from Synology to Client Size: most are 9014 bytes (in both directions) IP Flags: Don't fragment I don't see a need or point to running jumbo on a home network -- most devices in a home setup don't support jumbo or dont support the same frame size, etc. It is strongly recommended to choose Flow Control. Physical interface (Layer 2 (L2) / (L3)) When the jumbo frame feature is enabled on a port, the port can switch large or jumbo frames. Line rate % and PPS performance comparison for jumbo frames Jumbo frames. xxx): 8184 data bytes ping: sendto: Message too long If you have enabled jumbo frames on your client but not the destination (or a switch in between) you’ll see: Jumbo Frames can be used to allow more data to be transferred with each Ethernet transaction and reduce the number of frames. If you try to turn on jumbo frames in DSM you completely lose the connection to the NAS. Testing Network Connectivity. I tried running jumbo frames on my Synology years ago, but ran into bizarre and inconsistent networking problems. Synology’s NASes are based on platforms with ARM or PPC processors although it is the x86 architecture that delivers the highest performance today. MTU is the key to using Jumbo Frames. As for Jumbo Frames, I found in some circumstances they increased throughput 20-30%, but I know people who haven't seen any improvement, different horse for different courses. Here are the speeds I got with 6 x 12TB WD Reds in RAID 5 with no Form HPE Manual msa 2040 best practices Jumbo frames: A normal Ethernet frame can contain 1500 bytes whereas a jumbo frame can contain a maximum of 9000 bytes for larger data transfers. Answers are given from a home hack perspective, so take that into account for considering your "best practice" [*]How important is IPV6 and jumbo frames ? IPv6 in an internally environment is almost irrelevant at this point. Just not on an isolated vlan, but on dedicated hardware just for the storage network. (LACP and Jumbo frames support) As you can see, I use a potent test system with an ultra-fast PCIe SSD from which all the tests are executed, which ensures there is no bottleneck on my side since the RevoDrive 350 480 GB can achieve up to 1800 MB/s read and 1700 MB/s write speeds (sequential). Jumbo frames can be a bit of a challenge, though, as there are multiple sizes, interpretations, and technologies, making it difficult to fully understand and First impressions. I have looked there and everywhere also on the settings of the router, and I cannot find a way to enable jumbo I'm trying to setup jumbo frames but for some reason it doesn't work. Table 1. [1] Conventionally, jumbo frames can carry up to 9000 bytes of payload, but variations exist and some care must be taken using the term. HanziHefti. Jumbo frames almost always better than default of MTU of 1500. Best practice is not to do that. So jumbo frames are enabled for all ports. 5in hard disks. Now when testing I am getting up to 80MB/s. Of course in a SAN environment you want to use jumbo frames. Limitations in PC hardware and software, as well as network hardware, can result in higher drop rates at higher frame sizes, causing excessive retransmissions and leading to lower throughput. For supporting jumbo frames, you can either change the MSS value of the TCP profile nstcp_default_profile, or create a custom TCP profile and set its MSS accordingly, and then bind the custom TCP profile to the desired load balancing virtual servers and services. Create LAG, select members: Configure VLAN membership and PVID for the LAG as well: Step 3: Connect and enjoy 2Gbps network bandwidth Best practice guide about Jumbo Frames . 9 Dell EMC Unity: Best Practices Guide | H15093 Flash drives have the highest performance potential of any drive type. The max mtu are diferent. This feature optimizes server-to-server performance. Historically, Ethernet has a maximum frame size of 1500 bytes. The fast and well-equipped DS411j may be expensive, but it's the best four-disk NAS enclosure you can get. 2. 2. 4. A Jumbo frame is an Ethernet frame that can carry a TCP packet whose size is more than 1500 bytes. Oversized packets / FCS errors This issue has something to do with jumbo frames I suppose. Before enabling jumbo frames, check with your hardware vendor to ensure that your physical network adapter supports jumbo frames. I just got a new Synology DS1621 and thought I'd try the 'Virtual Machine Manager' (VMM). The standard size of Ethernet frame is 1518 bytes, but if VLAN tagging is used, then the frame size increases by 4 bytes and becomes 1522 bytes. However, when you do this, it only enables jumbo frames on the same layer-2 segment. I'm trying to setup jumbo frames ISCSI traffic on the VMkernel port and I noticed some weird behavior: I am able to vmkping the management interface while specifying up to 65507 in size with the -d option. My ping to my 10Gb ports on the NIC started dropping. Jumbo frames change the MTU size to 9000. Jumbo Frames Cisco Jumbo Frames Configuration Switch A & B Config t ! interface port-channel1 mtu 9216 ! copy run st Cohesity Jumbo Frames Configuration. File-read packets from Synology to Client Size: most are 9014 bytes (in both directions) IP Flags: Don't fragment Enabling jumbo frames specifically on the interfaces supporting the storage network might help improve the overall read/write performance of the Azure Stack HCI cluster. I’m making that distinction because other transports can have different MTU sizes. I found out last week that some of our layer 2 links (vPC links, access to distribution) have mismatched Jumbo Frames (spec sheets): 9KB (their website says 15KB but it looks like a different device) Server. xxx.