4

I'm having some issues expanding a RAID 5 array on a Synology DS413. The drive has gone from 3 x 3TB WD Green drives to 4 x 3TB. I started an expansion operation and it's been stuck at about 60% and extremely slow speeds for a week (about 350Kb/s when I check /proc/mdstat). I've tried increasing min/max speed limits and stripe_cache_size but it didn't change the actual speed.

The drive is near unusable while the expansion is running, transferring files out maxes out at 400Kb/s. I think the issue is related to bad sectors on Disk 1, when I try and run a SMART test on the drive it gets stuck at 90%.

So because I can't get data out of the disk and the RAID expansion will take over a month, I'm wondering if there's a way to stop the expansion? If I force reboot the disk by disconnecting power, will it corrupt the drives? Are there any other options that people know of?

gparyani
  • 1,881
Tom Maitland
  • 141

1 Answers1

2

Stopping a simple single disk partition resize is definitely not safe, IMHO stopping a RAID expansion could only be worst.

So, in my opinion: no, stopping a RAID expansion is not safe! (Unless someone at Synology say otherwise)
I don't really know if there is a way to stop it.

If you really need to stop the Raid expansion, try to make a full backup on another Nas/server, no matter if it take 1 month.

If you stop the RAID expansion, consider a total HDD/RAID corruption as one of the possible outcome, and be prepared for it.

You may try to ask also on Synology forum http://forum.synology.com/enu/

About my experience on the matter, I must say than I've never tried to stop a Raid expansion on any kind of server/nas/controller. I've just installed a bunch of simple Raid array in the past, and I'm a happy owner of a Synology DS213j.

Max
  • 1,099