Advertisement
Hi,<\/p>\n
just looking for some pointers with network performance on a guest VM (server 2019), the guest VM is hosted on Server 2019 server on hyper-V, i have a virtual swicth setup that points to our storage device (HP MSA2050 on 10.10.100.0 range), i have connected this adapter to the guest VM and picks up the drives fine and allows me to add and setup in DFS (it’s going to be a file server), but what i am finding is that the file transfer speeds are pretty poor , takes about 5mins to transfer a 30MB file , read is fine and works as it should, but the write speeds are bad …<\/p>\n
i have add a cpl of test LUNS to the actual VM host to test using the same adaptor that i have create the v-switch with and everything runs fine , 5GB transfer is coming in at 1050Mbs write and 2508Mbs read…<\/p>\n
have i configured the V-switch wrongly or am i missing some config somewhere… any help would be great<\/p>\n
thanks<\/p>\n
paddi<\/p>","upvoteCount":11,"answerCount":14,"datePublished":"2020-01-28T11:53:18.000Z","author":{"@type":"Person","name":"paddirooney","url":"https://community.spiceworks.com/u/paddirooney"},"acceptedAnswer":{"@type":"Answer","text":"
Personally I always avoid LUN’s inside VM’s as it can get messy. I’d always go for a Vdisk of the right size hosted on a datastore even if that datastore is over iSCSI. At least that way I know that all the iSCSI LUN’s are from the host and I don’t have any hidden away inside VM’s.<\/p>","upvoteCount":4,"datePublished":"2020-01-28T12:18:18.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/4","author":{"@type":"Person","name":"Gary-D-Williams","url":"https://community.spiceworks.com/u/Gary-D-Williams"}},"suggestedAnswer":[{"@type":"Answer","text":"
Hi,<\/p>\n
just looking for some pointers with network performance on a guest VM (server 2019), the guest VM is hosted on Server 2019 server on hyper-V, i have a virtual swicth setup that points to our storage device (HP MSA2050 on 10.10.100.0 range), i have connected this adapter to the guest VM and picks up the drives fine and allows me to add and setup in DFS (it’s going to be a file server), but what i am finding is that the file transfer speeds are pretty poor , takes about 5mins to transfer a 30MB file , read is fine and works as it should, but the write speeds are bad …<\/p>\n
i have add a cpl of test LUNS to the actual VM host to test using the same adaptor that i have create the v-switch with and everything runs fine , 5GB transfer is coming in at 1050Mbs write and 2508Mbs read…<\/p>\n
have i configured the V-switch wrongly or am i missing some config somewhere… any help would be great<\/p>\n
thanks<\/p>\n
paddi<\/p>","upvoteCount":11,"datePublished":"2020-01-28T11:53:18.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/1","author":{"@type":"Person","name":"paddirooney","url":"https://community.spiceworks.com/u/paddirooney"}},{"@type":"Answer","text":"
Do you have a dedicated iSCSI network?<\/p>\n
Why does the VM need to see the LUN? Why not put a VDisk in that LUN with the data?<\/p>","upvoteCount":1,"datePublished":"2020-01-28T11:59:46.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/2","author":{"@type":"Person","name":"Gary-D-Williams","url":"https://community.spiceworks.com/u/Gary-D-Williams"}},{"@type":"Answer","text":"
hi Gary,<\/p>\n
yeah we have the storage (ISCSI) sitting on seperate Range and switch…<\/p>\n
plan is to use the guest VM as our new File/Print Server, so connecting to the Storage using ISCSI seemed like the best solution…<\/p>\n
to be honest i never thought of Vdisk’s ??<\/p>\n
paddi<\/p>","upvoteCount":0,"datePublished":"2020-01-28T12:15:24.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/3","author":{"@type":"Person","name":"paddirooney","url":"https://community.spiceworks.com/u/paddirooney"}},{"@type":"Answer","text":"
now that you mention it that sounds so much better and manageable, we need a cpl of disk around 4TB is this ok on the Vdisks, i’ve never used them so forgive my ignorance … i could then use that other network port in a team ,<\/p>","upvoteCount":0,"datePublished":"2020-01-28T12:22:55.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/5","author":{"@type":"Person","name":"paddirooney","url":"https://community.spiceworks.com/u/paddirooney"}},{"@type":"Answer","text":"
@paddirooney<\/a> I would go with what @garydwilliams<\/a> , keep it simple by presenting you storage as datastores rather than across iSCSI to each VM, make trobulbeshooting far easier.<\/p>","upvoteCount":1,"datePublished":"2020-01-28T12:30:49.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/6","author":{"@type":"Person","name":"scottbrindley","url":"https://community.spiceworks.com/u/scottbrindley"}},{"@type":"Answer","text":" yeah i think thats what i will be doing , i don’t know why i hadn’t actually thought of that at the time, it seems like the simple way to do it lol<\/p>\n oh well you live and learn , that’s whats great about spiceworks , you get real world solutions<\/p>\n thanks again<\/p>","upvoteCount":0,"datePublished":"2020-01-28T12:33:51.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/7","author":{"@type":"Person","name":"paddirooney","url":"https://community.spiceworks.com/u/paddirooney"}},{"@type":"Answer","text":" quick question on the Vdisks, when connecting it up in hyper-V, will it be present as a new disk , i that i will need to fomrat the disk inside the guest VM ?<\/p>","upvoteCount":0,"datePublished":"2020-01-28T12:38:59.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/8","author":{"@type":"Person","name":"paddirooney","url":"https://community.spiceworks.com/u/paddirooney"}},{"@type":"Answer","text":" If you use failover clustering, you have to present it as a LUN to the VM, otherwise the ISCSI storage will disconnect whenever the VM moves due to failover.<\/p>\n Using the ISCSI as a VHD storage vs LUN also affects file level backups.<\/p>\n In my case, I have both of these, AND the file storage LUN on the ISCSI appliance is so large that the data cant be migrated inside a VHD. There’s no room to create a VHD big enough.<\/p>","upvoteCount":1,"datePublished":"2020-01-28T16:50:44.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/9","author":{"@type":"Person","name":"CrashFF","url":"https://community.spiceworks.com/u/CrashFF"}},{"@type":"Answer","text":" Crash, Failover clustering is part of the plan and would be looking to implement that at some point …<\/p>\n i currently have them presented to the guest VM as ISCSI LUNS , but the write speeds are terrible , read is fine …<\/p>\n i did test them us VHDX files and the write speeds did improve to around 580Mbs , not as fast as ISCSI connection to the actual host server mind you<\/p>\n any ideas ???<\/p>","upvoteCount":0,"datePublished":"2020-01-29T06:28:04.000Z","url":"https://community.spiceworks.com/t/poor-guest-vm-speeds-when-writing-to-iscsi-storage/748583/10","author":{"@type":"Person","name":"paddirooney","url":"https://community.spiceworks.com/u/paddirooney"}},{"@type":"Answer","text":"