Re: File-backed VMs under RAIDframe RAID-1

[Thor Lancelot Simon <tls%panix.com@localhost>]

On Tue, Mar 02, 2010 at 11:27:30AM -0600, Dustin Marquess wrote:
> All,
> 
> I have a question regarding using RAIDframe RAID-1 & Xen.
> 
> Months ago on one setup a Linux VM that was P2V'd from a vendor
> install (CentOS) got completely corrupt.  I scratched it off as a
> vendor problem.
> 
> Today my Oracle DBA was complaining that Oracle died with 600 errors.
> I logged on to the Xen dom0 and noticed that RAIDframe had kicked a
> drive out:
> 
> Feb 24 03:37:23 fxnpvm02 /netbsd: wd0a: error reading fsbn 394348511
> of 394348511-394348607 (wd0 bn 394348574; cn 391218 tn 13 sn 11),
> retrying
> Feb 24 03:37:23 fxnpvm02 /netbsd: wd0: (uncorrectable data error)

On a read error, RAIDframe *should* be returning you the data from the
other member of the RAID set, for a RAID-1 set.  But if there's any chance
the drive returned zeroes or bad data before it started actually returning
error... ugh.

Thor