2009/1/3 Frederique Rijsdijk <frederi...@isafeelin.org>:
> Hi freebsd-questions,
> For personal use (photo/video storage), I'm looking into creating a huge
> single ZFS (raidz) volume that will replace my current collection of
> drives used as storage. I'm thinking 4*1TB drives in RAID5(z).
> My question is regarding the flavour of drivers that one can choose
> from: Desktop class drives, or the so called RAID/Enterprise class drives.
> The difference between the two being the way such a drive handles the
> bad-sector/block handling and remapping. I understand that Desktop class
> drives do all this internally, and this is a process that can take up to
>> 60s (even minutes on some), and during this process the drive is
> unavailable to the controller. The RAID edition drives all appoach this
> differently and alot faster, typically before 8 seconds.
> How does ZFS handle this? Should I be looking for the RAID class drives
> or can Desktop class drives be used here?
> My worry is of course that such a drive (destkop class) will be marked
> defective and thrown out of the raid volume if a remapping of bad
> sectors occurs and the drive will be unresponsive to the controller/ZFS
> for > 8 seconds.
> Some drives can be configured in this area, but not all, and there's
> quite a price difference in the two, the desktop class being up to 50%
> cheaper in some cases..
> Anybody that can shed some light on this?
> Thanks,
> -- Frederique


Before i knew the difference between the two, i got myself a bunch of
"desktop" HDD. From what I've experience, freebsd just drops the
drive. (Currently running in a gmirror config). I'm not sure about
ZFS, but i would assume it would do the same. All you need to the do
reattach the drive and it will sync back up again.

I didn't know the reason why it dropped off, but when i checked the
SMART, it showed 1 bad sector reallocation.

If it happens to a disk with UFS, it crashes and restarts the machine,
UFS doesn't like disappearing drives.

David N
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