Alerts not triggered by removing a drive.

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killervette

Dabbler
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Sep 7, 2011
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I dont know if this is a bug or not, im very new to freenas. I have a ZFS Raidz1 with 3 drives. I physically disconnect a sata cable to remove the drive. The freenas webpage does not show any alerts. Viewing the drives in the area shows a drive as "unknown". The terminal screen on the server shows that it lost the ata device.

Is this normal? The array shows as healthy. It took a reboot to show the alert
 

jgreco

Resident Grinch
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May 29, 2011
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I can confirm that this seems to be a problem. I pulled one drive out of a mirror. zpool status shows the state as ONLINE for the pool, but has a status note about an unrecoverable error. Oddly, the pulled drive shows as "ONLINE" as well, which is quite the amazing feat of wireless communications.
 

killervette

Dabbler
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This bug really keeps me from switching my current setup to freenas. Without some sort of notification of a dead drive, I cant trust it. I dont want to have to restart the server every couple days just to see if my drive is bad. any eta on this?
 

jgreco

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It appears that the situation is eventually detected, possibly by a scrub, but I agree that this is undesirable. There was some more discussion of it on the bug tracker, I don't have the ticket number handy.
 
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gcooper

Guest
It appears that the situation is eventually detected, possibly by a scrub, but I agree that this is undesirable. There was some more discussion of it on the bug tracker, I don't have the ticket number handy.

I think this is what you were looking for: http://support.freenas.org/ticket/1066 . Either a zfs scrub or enough drive timeouts will cause the phantom drive to drop out of the zpool, but it could take a few days, depending on the machine usage.

Please note that not all chipsets support hotswap (in particular I know that older chipsets, pre-ICH7, couldn't do it).

What messages are you seeing on the console?

Also, I just had an epiphany on how this can be solved (not really elegantly, but it will do). I was reminded of a "hack" that someone at my old employer used to detect failed disks. I thought it was unnecessary, but now I understand why it was put in place.
 
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