We use RAID 1 on servers that are not file servers, RAID 4 or 5 on file-servers
(depending on how much need for redundancy we have on a particular filer) and
back up the RAID4/5 partitions to tape daily. (with the RAID 1's backed up to
the RAID 4/5's before those are backed-up to tape.) Tapes are taken off-site
daily. (with backup/restore procedures tested monthly. etc.. )
We're in a data centre that isn't likely to have blackouts. (It can run on
batteries for 6 hours, and has diesel generators with 48-hours worth of fuel
on-site, as well as an emergency supply-chain for the diesel.)
I've not seen problems as described below on 3Ware cards... I believe the
configuration for each RAID is is backed-up on each disk in the RAID set. I've
never had a problem with those. (I have seen a problem with another brand of
SATA RAID controller, when in RAID 1 mode, putting a blank replacement in a
bank after a drive failed caused the controller to rebuild the BLANK drive onto
the GOOD drive.. erasing all the data.. thank goodness for data recovery.. we
had to get the data back of the drive that had gone bad, and managed to
retrieve it all!)
XFS filesystems no all of the above, just for reference.
A. Khattri wrote:
On Sat, 24 May 2008, Michelangelo wrote:
Besides, RAID 5 is not always a good choice: I got 2 adaptec and 3ware
cards
that got them bioses/nvram messed up thanks to power spikes during the
big
italian blackout back in 2003. And yes, they were behind online APC ups
We use RAID 1 but generally our servers are located in a data center. We
survived the big New York blackout a few years back plus several other
power problems in the datacenter. Our 3Ware and Adaptec RAID cards were
unaffected by any of these outages.
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