the value of a journal filesystem?

[Robert Watson]

On Fri, 4 Feb 2005, Steve Kargl wrote:

> I'm not sure if this is a ext2fs, ext3fs, or reiserfs, but the 2nd
> paragraph is somewhat ominious.  The notice does statement whether the
> damaged filesystems are on other disks or on disks in other machines
> (ie. nfs mounted). 

Journalling, as with Soft Updates, relies on generally correct operation
of the media (i.e., changes are written or not, etc), and is intended to
protect only against "fail stop" failure modes.  Handling media failure is
generally a task for RAID arrays, which are intended to mask corruption by
coercing corruption to "fail stop" on the media.  So the interesting
question here would be: did their RAID not protect them?  Or did they not
have RAID?

Robert N M Watson


> 
> -- 
> steve
> 
> ----- Forwarded message from do-not-reply at ecoscentric.com -----
> 
> From: do-not-reply at ecoscentric.com
> X-Accept-Language: en-gb, en, en-us
> To: sourceware users <do-not-reply at ecoscentric.com>
> Subject: Outage of gcc.gnu.org / sourceware.org / sources.redhat.com
> Date: Fri,  4 Feb 2005 05:16:07 +0000 (GMT)
> X-Spam-Checker-Version: SpamAssassin 3.0.1 (2004-10-22) on 
> 	troutmask.apl.washington.edu
> X-Spam-Level: 
> X-Spam-Status: No, score=-0.4 required=3.0 tests=BAYES_05,NO_REAL_NAME 
> 	autolearn=no version=3.0.1
> 
> sourceware.org, also known as sources.redhat.com, also known as 
> gcc.gnu.org, also known as ecos.sourceware.org is down at the moment due to 
> a failed disk.
> 
> Unfortunately the failure caused significant filesystem corruption, even 
> though that shouldn't have happened. As a result, sourceware will be down 
> for some time longer. The sourceware overseers and Red Hat sysadmins are 
> working hard to bring it back up. The disk has been replaced and the 
> filesystems are about to be restored from backups, although we are still 
> trying to see if there's any way to recover the filesystem data.
> 
> We will send another notice when it comes back, so sit tight and watch this 
> space. If there are any questions, e-mail <angela+sw at wonderslug.com>
> 
> Yours,
> 
> The sourceware overseers
> 
> ----- End forwarded message -----
> 
> -- 
> Steve
> _______________________________________________
> freebsd-chat at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-chat
> To unsubscribe, send any mail to "freebsd-chat-unsubscribe at freebsd.org"
>