10 messages in org.freebsd.freebsd-fsRe: Odd file system corruption in ZFS...| From | Sent On | Attachments |
|---|---|---|
| Andrew Reilly | Apr 24, 2012 7:29 am | |
| Peter Maloney | Apr 24, 2012 7:37 am | |
| Andrew Reilly | Apr 24, 2012 4:21 pm | |
| Bob Friesenhahn | Apr 25, 2012 6:58 am | |
| Peter Maloney | Apr 25, 2012 8:36 am | |
| Andrew Reilly | Apr 25, 2012 8:32 pm | |
| Andrew Reilly | Apr 25, 2012 8:44 pm | |
| Bob Friesenhahn | Apr 26, 2012 7:23 am | |
| Peter Jeremy | Apr 26, 2012 2:06 pm | |
| Andrew Reilly | Apr 28, 2012 5:05 am |
| Subject: | Re: Odd file system corruption in ZFS pool | |
|---|---|---|
| From: | Bob Friesenhahn (bfri...@simple.dallas.tx.us) | |
| Date: | Apr 26, 2012 7:23:56 am | |
| List: | org.freebsd.freebsd-fs | |
On Thu, 26 Apr 2012, Andrew Reilly wrote:
On Wed, Apr 25, 2012 at 08:58:41AM -0500, Bob Friesenhahn wrote:
With properly implemented hardware (i.e. drives which obey the cache flush request) it should not be possible to corrupt zfs due to power failure.
Does that comment apply to enerprise-class SATA drives? I was under the impression that all SATA drives lied about cache flush status. Hence the notion that I need to get myself a UPS.
A blanket statement like that (about SATA drives) would not be very accurate.
UPSs are quite valuable in that they help the system avoid marginal operating conditions.
If power is lost while a drive is currently writing, perhaps it will move the head to the wrong position and write to the wrong place on the disk, or perhaps the data it does write will be junk.
Bob
-- Bob Friesenhahn bfri...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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