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ReadyNAS 4220 Locking up RAID 10 and ISCSI
Hi We got a 4220 as a big storage box with decent perf to go with an HP 3par in our 3 node Windows server cluster. It is running over ISCSI. We bought a Netgear M7100-24X 10GB switch to go with it....
We are running 6.2.4, I see here: http://kb.netgear.com/app/answers/detail/a_id/29938 that 6.4.0 is released, is that a final release now? Should I try that to address any BTRFS and ISCSI issues that are fixed according to the changelog?
6.4 is now released.
Cool, thanks. I have installed it this morning and provisioned a new 8TB iscsi lun on my freshly build RAID 10 volume. It has got a few VM's on it. Now we wait...
If you're running VMs, set sync writes to disabled, make sure it is a thick LUN, no snapshots, no bit rot protection, and be on 6.4.0. This should increase the performance of your VM as well as keep the file system less-able to become fragmented. Being fragmented is a huge cause for lock-ups on copy-on-write file systems.
Also set up a defrag and balance schedule to keep your volume clear from fragmentation. Have it run defrag then balance in that order during a time of least use.
Hope this helps.
Hi, thanks for the reply. We had thick luns, sync writes off, copy on write off and no snapshots. Maybe we needed to make sure it was all set that way before putting VM's on instead of changing settings after it was already in use. I only learned about copy on write and sync writes after we had some VM's running on it.
So far we have been up for a day which is better than the first RAID 10 effort. If it makes it through the weekend, it will equal the longest run we had without a crash. Fingers crossed the kernel changes in 6.4.0 are the silver bullet that makes this NAS stable. In RAID 10 with the disks we have in it, performance is sparkling and it has loads of space. If it can be as stable as our old faithful ReadyNAS 2100, I would be stoked. I have scheduled a defrag and balance to run on a schedule now.
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