Mark Grant wrote:
Yeah, this is my main concern with moving from my cheap Linux server with no
redundancy to ZFS RAID on OpenSolaris; I don't really want to have to pay twice
as much to buy the 'enterprise' disks which appear to be exactly the same
drives with a flag set in the firmware to limit read retries, but I also don't
want to lose all my data because a sector fails and the drive hangs for a
minute trying to relocate it, causing the file system to fall over.
I haven't found a definitive answer as to whether this will kill a ZFS RAID
like it kills traditional hardware RAID or whether ZFS will recover after the
drive stops attempting to relocate the sector. At least with a single drive
setup the OS will eventually get an error response and the other files on the
disk will be readable when I copy them over to a new drive.
I don't think ZFS does any timing out.
It's up to the drivers underneath to timeout and send an error back to
ZFS - only they know what's reasonable for a given disk type and bus
type. So I guess this may depend which drivers you are using.
I don't know what the timeouts are, but I have observed them to be long
in some cases when things do go wrong and timeouts and retries are
triggered.
--
Andrew
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