On Friday 17 October 2008 15:49:54 Xin LI wrote:
> JoaoBR wrote:
> > Hi
> >
> > constantly I find data corruption on ZFS volums, ever from rrdtool, this
> > corrupt data happens on SATA disks, never seem on SCSI
> >
> > scrub is not able to repair, when comes to touch this files machines
> > reboots, deleting and restorin also is not possíble, seems I need to
> > delete the files, umount, scrub and mount again to clear it
> >
> > # zpool status -v os
> > pool: os
> > state: ONLINE
> > status: One or more devices has experienced an error resulting in data
> > corruption. Applications may be affected.
> > action: Restore the file in question if possible. Otherwise restore the
> > entire pool from backup.
> > see: http://www.sun.com/msg/ZFS-8000-8A
> > scrub: none requested
> > config:
> >
> > NAME STATE READ WRITE CKSUM
> > os ONLINE 0 0 0
> > ad4s1d ONLINE 0 0 0
> >
> > errors: Permanent errors have been detected in the following files:
> >
> > /usr/local/www/data-dist/monitor/wip_diskio.rrd
> > /usr/local/www/data-dist/monitor/200.152.90.12mon.rrd
> >
> > some idea?

>
> For ZFS: I think you need to remove these file. ZFS scrub does not
> recover file if you don't have redundant, e.g. copies=2 or raid-z, etc.
>


ok I see, I discovered this but should the machine crash when scrub reach the
damaged file?


> For the data corruption itself: I think this is highly critical issue
> if you are sure that the hardware is good. What controller and disk are
> you using?


disks are most seagate or maxtor sata-2 250G new, max 6 month old
the Sata controller are mostly Nvidia as MCP51, MCP61, CK804

thank's
--

João







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