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How do I force a resync?
How do I force a resync?
It looks like I have one drive going/gone bad. The system put itself in degraded/read-only mode. Fair enough. (I was able to get a backup, but it seems that none of the TimeMachine backups are preserved.)
I inserted a new drive and after 20 hours the system was unhappy and back online. All good.
Then several hours later the offending disk had more errors. I took it out.
But the system is still in degraded/read-only mode.
I see elsewhere advice that I should have put the new drive in the old slot. But I didn't do that.
What do I do now?
How do I get the system back in working order? I've got plenty of disk space. I tried a scrub, and that wasn't enough to resync things.
How do I force a resync? Is that what I want to do?
- Malcolm
4 Replies
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Unfortunately, I believe what you are trying to do is not a re-sync, it's a shrink -- which the ReadyNAS does not support. When you add an additional drive with XRAID enabled, the volume normally will expand to one more drive. I believe yours did, even though one drive was failing. You are lucky that process didn't cause you to lose the volume completely. Now that the drive has totally failed, you are shy one drive for the new volume size to be redundant. I posted a very complex process using SSH and the Linux command line whereby a volume can be shrunk. Given you didn't know to replace the failed drive instead of add another, I'm going to assume that's beyond your level of comfort. That gives you two options: Replace the bad drive and re-sync with the new, larger volume; or backup, factory default, and restore. But given the current fragile nature of your volume, a current backup is a good idea even if you just plan to replace the bad drive. It's actually a good idea always.
OK, I was assuming the NAS was smarter than it was. (In retrospect, how was it to know that I was removing the failing drive permanently.) And that it mattered which physical slot it went into.
I'm ok with ssh, as I've been hacking Unix for many decades. I didn't find these directions online.
But it might be easier, as you point out, to just put a new drive in the failed (now empty) slot. Does it have to be the same model and size, or can it get bigger?
Thank you!
-- Malcolm
MalcolmSlaney wrote:
But it might be easier, as you point out, to just put a new drive in the failed (now empty) slot. Does it have to be the same model and size, or can it get bigger?
It can be bigger, with some constraints. When expanding the disk, it needs to match the size of another (larger) drive in the array, or it needs to be bigger than the largest drive.
But if it is bigger than the largest drive, then you won't see any capacity increase until you upgrade another drive to the same size. The capacity rule is "sum the disks and subtract the largest".
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