RE: raid5, media scans and stripe-wise resync

I have a cron job that tests each disk once per day.  This really helps.
But I have still had md find a bad sector.  But the risk of having 2 disks
with bad sectors is very low if you test each night.

Guy

-----Original Message-----
From: linux-raid-owner@xxxxxxxxxxxxxxx
[mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Konstantin Olchanski
Sent: Monday, October 25, 2004 6:02 PM
To: Guy
Cc: 'David Mansfield'; 'Jure Pe_ar'; linux-raid@xxxxxxxxxxxxxxx
Subject: Re: raid5, media scans and stripe-wise resync

On Mon, Oct 25, 2004 at 04:29:09PM -0400, anybody wrote:
> 1 disk has a bad sector and another disk fails, game over.

On a single-disk, 1 bad sector kills just the one unlucky file.
On a degraded RAID0 or RAID5, 1 bad sector kills the filesystem.
On a healthy RAID0 or RAID5, 2 bad sectors on different disks kill the
filesystem.

Does this make sense?
RAID is less fault tolerant than a single disk?

-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada
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