ZFS I have 3 usb disks all zfs

[azathoth]

and I keep same fiels on all 3
each a pool
because I afraid if I merge all teh disk in 1 pool
then a fault im screwed

what think?

 

[SirDice]

You can't "merge" two existing pools. You'd have to destroy both pools and build a new one.

 

[ekingston]

I have 2 USB disks with ZFS. I set them up in a mirror. If one fails, the other still has the data.

To better understand how it all works, I intentionally disconnected one of the drive while it was running. I still had access to the data. I was able to re-integrate the disk and "resilver" after the fact.

My disks are a pair of WD MyPassport 2TB USB3 disks. They had about 400GB of data on them when I ran the test. Resilver took a while (something under 2 hours).

One important think I noticed, there is not any sort of obvious notification that the disk was missing. Just some log messages and the usual notification of the disk disappearing in /var/log/messages. I need to add more robust notification so I get notified if one of the disks has a problem.

 

[SirDice]

One important think I noticed, there is not any sort of obvious notification that the disk was missing.

Recent versions of FreeBSD have gotten zfsd(8) for this exact purpose. It will automatically enable hot-spares and do some fault resolving. I would expect it to complain loudly if any of the existing pools become degraded. It doesn't seem to have been backported to 10.x though, but 11.1 should have it.

 

[ekingston]

Recent versions of FreeBSD have gotten zfsd(8) for this exact purpose. It doesn't seem to have been backported to 10.x though, but 11.1 should have it.

Oh good. I haven't started my upgrade to 11, still on 10.3. I meant to do it in the spring but I got busy with other things. Now I'm planning to do so a month or so after 11.1 gets released.