Ed,
Are you already using Volume Backup for Celerra (VBB)?
You configure VBB by setting the backup type as nsrndmp_save -Type vbb
in the client Backup command field or set the environment variable vbb=y
in the Application Information field.
Rob
-----Original Message-----
From: EMC NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU] On
Behalf Of eudonj
Sent: Wednesday, June 16, 2010 11:03 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Best Method to backup 3.8T Home Folder with
Networker?
> 3.8TB in 30hrs is the equivalent of 17MB/sec ?? Can someone verify
this number? If my math is correct, this is very slow for an NDMP drive,
and I am assuming that the drive is connected to the Celerra. i.e, the
data is not going through the LAN before being written to the NDMP
drives.
>
> Assume that we are using NDMP configured drives that are connected
directly to the filer, I have seen LTO-3 drives can write
(conservatively) 120MB/sec. Again if my math is correct, then backing up
3.8TB should take approx 8.8 hours.
>
> If you can also backup 4 streams in parallel (Celerra allows for max
of 4 pax threads that allows for 4 backup streams), and assuming that
each stream backs up equal amount of data, then this should reduce the
backup time to approx 2.2 hours. In theory.
>
> So... is there 4 drives connected directly to your NS40, (scsi or
fiber)?
>
> You mention that you do daily INC backups. Incremental backups are not
allowed with NDMP backups. You are only allowed to specify full or
differential type. If you specify incremental, then the filer will use
level=full, because the filer does not know what is incremental.
>
> Make sure you have Snapsure enabled on your Celerra, otherwise this
can cause your backups to fail.
>
> You generate multiple streams by spreading the data across multiple
partition. Not sure why you would not want to take advantage of this,
especially since you are trying to reduce the backup time.
>
>
> Well, if you are limited to just one stream, then make sure that The
NS40 is writing directly to a locally connected drive to the Celerra. If
possible, replace the lto-3 with a faster drive lto-4, 5, 6... I know
they are more expensive, but so is the time needed to backup.
>
> Finally, see if EMC can do a health check on the NS40 to make sure it
is performing optimally.
In my last meeting with our EMC crew we was lead to believe that given
the size and number of files that the backups would be this slow
normally, doesn't seem right to me, but they are the experts, right. EMC
did run some health checks on the backup end but I will ask about the
480.
As far as the crashing part that is a comment from my team who has been
here for years(I'm the new guy) I havent verified that.
Everything is going Fiber from NS480 to tape drives. I am in the process
of re organizing the groups so that the home folders get 3 hours of
pretty much deticated use of the library, have a couple of small jobs
run concurrently but they normally take about 15mins. I have 7 drives
all fiber attached LTO3.
I am thinking about getting away from the NDMP for this folder so that I
can use wildcards and use 26 saveset, that is what I did my other
networker domain. \home\a* ....
I would love to split the folders up but we now have 3 silos of Admins -
design, operations and backup. Me being in the backup group fall on deaf
ears when trying to get the other two to understand that even though it
makes the helpdesk life easier to use 1 folder, it makes backing it up a
real nightmare.
Thanks for all the input so far,
Ed Johnson
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