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Very poor performance on iSCSI
Starting situation: Windows 2012R2 with MPIO with 2 gigabit adapters. RN316 with 6.9.3, 6 Drives full.
When a backup starts from the other NAS (same model) to this one (both DR or rsync) the iSCSI ...
I don't know if it would help you in your situation but we found that after we upgraded to 6.9.3 OS we had very slow save speeds. Strict sync had been disabled in the 638 OS but is enabled by default in the 6.9 OS. When we disabled the strict sync that problem was resolved. We are not using iscsi so I don't know if this is your issue but It is an easy setting to change and might be helpful. Here is the link to my post about the issue that references others who researched the problem originally. https://community.netgear.com/t5/ReadyNAS-in-Business/Slow-saves-for-Revit-2018-after-OS-upgrade-from-6-8-1-to-6-9-2/m-p/1557861#M8003
Thanks for your reply, but I'm not using SMB and tested sync writes on and off ono iSCSI too with no success.
Today I'm trying to run a backup and I get horrible performance and not constant. In the graph below up is IOPS and down Network.
It goes up, then drops and then slowly gets better, but nothing acceptable.
We'll dump Netgear stuff asap...
What about CoW, bit-rot protection and snapshots? Have those always been disabled on this LUN?
Is the LUN thin/thick?You can find the relevant info in the first post.
BTW, no CoW and compression, thick LUN.
Edit: and no snaps
Right now I killed the long running backup, it will terminate in a month at this rate. I tried to offline the LUN from Windows disk manager and it is hung since 30 min.
This is pretty reproducible, when some sustained iSCSI activity is ongoing all other iSCSI tasks also on other LUNs & portals just hang crashing the apps on them.
I did the same things on the other identical device but with 6.9.0 and is is the same. On this unit also MPIO never catches up, only one link is used despite both being configured.
I repeat this again, the same servers on other vendor's devices on the same gear pump full gigabit speed and several times balanced MPIO reaches 1,5/1,7 gbit.
Please send in your logs (see the Sending Logs link in my sig).
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