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Re: [Networker] Disk Backup Advice
2006-12-12 08:25:39
If you are using RAID-3 make sure you have only a single stream reading
from the device - otherwise you will kill the performance.
For a reason no-one can find documented, we have multiple 2Tb Clariion
devices which we found to be RAID-3 5400rpm ATA disks (setup before our
time). Single stream performance is great and we can get it up to
around 90Mb/s on benchmarks, but they are configured with two AFT
devices each so when the staging kicks off we get about 30Mb/s total
performance from each RAID device. Our poor LTO-2s are sitting there
performing at half speed all day.... Because of that we end up with a
stage that takes 18 hours in a 12 hour window.
If you have it in your budget, I would suggest looking at VTLs - the
Netapps ones are quite nice. They are a lot more flexible and can
transparently handle the staging to tape for you.
cheers,
Adrian
Siobhán Ellis wrote:
So, you are going to backup systems across the network to a network mounted
disk farm. Therein lies a problem!
Then you are going to clone (not stage?) to tape by pulling the data across
the network again?
My basic question is, why are you going to backup to disk?
As for your device, make sure it has some form of RAID, and it should be
RAID3 at a minimum (Good for large block IO's)
Siobhan Ellis
IDATA Integrity Pty Ltd
Sydney
On 12/12/06 9:55 AM, "Tony Skalski" <ajs AT STOLAF DOT EDU> wrote:
Greetings,
We are taking the plunge into disk backup and are looking for advice on
some initial setup options. We have a single Networker 7.2.1 server on RH9 (to
be updated to the latest 7.2.x before proceeding).
We backup approx 40 Linux, NetWare, Mac and Windows boxes, a few MS-SQL
servers,
and an Oracle DB, however the latter is just a file backup of the backup
performed by Oracle's tools. All told, about 6TB in a monthly cycle of one
full
and incrementals. We currently use three tape pools: full, incremental, and DB
(for the databases), however, we are open to changing this if another
arrangement is preferable. Our plan is to backup to disk at night and then
script the cloning process during the day.
We will be backing up to one or more NFS-mounted file systems on another box
with a lot of disk (12 x 750GB SATA). I am looking for recommendations on
partitioning: what filesystem to use, how many partitions to create, whether
or
not the partitions should correspond with media pools, with the goals of
performance and spreading the load over the 12 disks as evenly as practical.
Thanks!
ajs
Siobhán
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