On Apr 5, 2007, at 9:48 AM, Fazil Saiyed wrote:
Hello,
Could you explain a bit the selective backup method you are
employing, to
my knowlede, NDMP backups are block level with capability to
restore at
file level ( db file in your case), i am not aware of any modules that
lets you backup or restore to file level with NDMP backups withen a
dB.
I am using the client resource options "type=image, hist=y, update=n"
in the client resource.
The backup level is controlled by the client's group, and it is set
to full.
You mentioned the GB links, so if you are using over the network
method,
NDMP funtionality of block level backup does not change, however,
you may
want to attach the drive directly to NDMP mirapoint server to use FC
speeds, usually, in most cases attaining native tape drive speed, this
will help your backups a lot, if i saw your logs correctly, it took
you
over 25 hrs to backup just close to 600 GB,in my experiance with
good NAS
performance ( NDMP-V4) in my case that much data can be backed up with
LTO2 in close to 6 hrs ( Netapp FAS3050c) in ndmp method.
Attaching the tape drives to our Mirapoint servers would be
prohibitively expensive. According to the Mirapoint engineers with
whom I have consulted, doing so would only give us a modest boost in
throughput.
With the options (type=image, hist=n, update=n), I typically get
around 13 hours, but these are email servers and they are almost
always heavily loaded by users who access their email via the box's
webmail software, IMAP, or POP.
So unless the mirapoint is performing poorly, you should attain heiger
speeds.
One would think, except that I have never seen more than 11MB/s going
to our tape drives, even from a lightly loaded server that we use
only for R&D purposes.
Adding storage node is a good idea in your case where lot of your
backups
are over the network to the MS, the reason you did not see
improvments is
probably because the server had different bottlenecks, i,e Network
or your
clients and not the server itself.
Try using some testing with native ndmp dump to the tapes, bigasm,
or MT
to verify your tape setup.
Unfortunately, doing testing other than NetWorker server-initiated
NDMP backups is my only option. Other than the variables I mentioned
previously, I have no control over how the backups work from the
Mirapoint side because it is a heavily closed system.
As far as server size, buy something that is reasonably fast with
room to
grow if bottlenecks appear.
Thanks
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