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Maintenance needed before horizontal expansion of Flex-raid-1
I plan to upgrade my disks in NAD RND314 where I have two disk in FlexRAID-1 and one disk as JBOD. Run the latest firmeware. My idea is to just for safety right now incrase one 4TB to 8TB disk i...
janpeter1 wrote:
Sound good. Just a last question, I guess. Since I have one slot (out of 4) free I thought I could mount it there first and perhaps make some check, before I use it to replace one of the RAID-disks. Is that a reasonable idea? Perhaps make disk test of this new disk?
Personally I always test my disks in a Windows PC using vendor tools (Lifeguard for Western Digital; Seatools for Seagate). I run the long non-destructive test, and follow that up with a full erase / write zeros test. I have had some disks that pass one of those tests, but not the other - and I have sometimes found failures with just-purchased disks.
The NAS will do the short SMART self-test before it adds the disk to your volume. If you can't test the disk in a PC, then you could insert the disk the 4th slot, create a volume on it, and then run a disk test on that volume. Then destroy the volume, format the disk, and remove it. After that, hot-swap with the disk you want to replace. (Note that if you were running XRAID you couldn't do this).
FWIW, I suggest you reconsider your use of FlexRAID. You can make a full backup, and switch to XRAID (reconfiguring the NAS and restoring the data from backup). You'd have the same amount of storage as you have now - just on one volume. Expansion in the future would be a bit simpler.
It is better to hot swap. That way, the NAS does not have to figure out what's going on when it boots with a degraded volume. You will see in the log that it saw the removal and insertion. NAS are built for that.
I have followd the detailed instruction by StephenB on page 13. So far everything goes as expected. I am now re-syncing and down 8 % in 6 hours. The original disk is 4 TB and it had about 3.3 TB data. This will take about 3 days. I just wonder if it is a good idea to just let it go on in a stretch - or good to shut down and restart next day, or so. Looking at performance heat looks ok 51 C for the new 8TB and 48C fo the old 4 TB and 41C for the almost in-active disk 3 that is also 4 TB.
Is it good to let the system rest a few hours - or is the sync then needed to start from scratch - more or less?
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