----- Original Message -----
From: "David Lethe" <david@xxxxxxxxxxxx>
To: "Cry" <cry_regarder@xxxxxxxxx>; <linux-raid@xxxxxxxxxxxxxxx>
Sent: Tuesday, May 20, 2008 7:18 PM
Subject: RE: Re: Two Drive Failure on RAID-5
-----Original Message-----
From: linux-raid-owner@xxxxxxxxxxxxxxx
[mailto:linux-raid-owner@xxxxxxxxxxxxxxx] On Behalf Of Cry
Sent: Tuesday, May 20, 2008 10:32 AM
To: linux-raid@xxxxxxxxxxxxxxx
Subject: Re: Two Drive Failure on RAID-5
David Greaves <david <at> dgreaves.com> writes:
Yep. Don't panic and don't do anything else yet if you're not
confident about
what you're doing.
I'll follow up with more info in a short while.
Info you can provide:
kernel version
mdadm version
cat /proc/mdstat
mdadm --examine /dev/sd[abcdef]1 (or whatever your array components
are)
relevant smartctl info on the bad drive(s)
dmesg info about the drive failures
Assuming genuine hardware failure:
Do you have any spare drives that you can use to replace the
components?
David
Thanks for the info. I was able to do a --force --assemble on the array
and I
copied off my most critical data. At the moment, I don't have enough
drives to
take all the data on the array, so I'm going to be at a bit of a
standstill
until new hardware arrives.
Since the copy of that data (about 500Gig of about 2TB) went so well, I
decided
to try to sync up the spare again and it died at the same point and the
raid
system pulled down the array. I'm trying to decide if I should follow
your
suggestion in sister post to copy the failed drive onto my spare or if I
should
just format the spare and try to recover another 500 gig of data of the
array.
Is there a mdadm or other command to tell the raid system to stay up in
the face
of errors? Can the array be assembled in a way that doesn't change the
array in
any way (completely read-only)?
I've got the older failed drive also (about 15 hours older). Can that
be
leveraged also?
The server isn't networked right now, but I'll try to get the above
requested
logs tonight.
By the way, I'm thinking about buying five of these:
Seagate Barracuda 7200.11 1TB ST31000340AS SATA-II 32MB Cache
and one of these:
Supermicro SUPERMICRO CSE-M35T-1 Hot-Swapable SATA HDD Enclosure
http://www.supermicro.com/products/accessories/mobilerack/CSE-M35T-1.cfm
and building a raid-6 array. I'll convert the surviving drives into a
backup
for the primary array. Any feedback on the above? Is there a
suggestion on an
inexpensive controller to give more SATA ports that is very software
raid
compatible?
Any suggestions for optimal configuration (ext3) and tuning for the new
array?
My load consists of serving a photo gallery via apache and gallery2 as
well as a
local media (audio/video) server so files sizes tend to be large.
Thanks,
Joel
===============
Joel:
Respectfully .. are you nuts???
Don't buy the 7200.11 disks. You bought a bunch of desktop class
drives, and they crapped out on you, and you are about to make the same
mistake again. Get the server class disk that is designed to run 24x7
duty cycle, which in your case would be the 'cuda ES.2
Sorry about the soapbox, but it never ceases to amaze me how people try
to save by buying disk drives architected with lowest possible cost in
mind, and don't investigate the higher-quality disks that are designed
for extended reliability and data integrity.
David
David and Joel,
Let me remember you to the power supply!
This is really important too!
The 24x7 cycle systems need a good quality PS and cables, connectors for
hdd.
One poor (Y) cable, or connector can make easy 1-2 or more failed drives at
a same time!
The SMART can monitor the actual state, but can not monitor the bad
connection and/or noise on the voltage.
Cheers,
Janos
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