You should see at least native rates on you backups.
I would do s sysstat -s -c 100 1 and see what CPU and network speeds are.
For AIT-2 I get 6-12 MB/s
For LTO it was Closer to 15 MB/s
This was three way backup with Sun 420R or Windows 2002 (DL580/DL580 G2)
How many filers are backing up at once?
You may need multiple GE networks to take advantage of the speed.
Also Contention on the volumes that house qtree could also slow you down.
-----Original Message-----
From: owner-toasters(a)mathworks.com [mailto:owner-toasters@mathworks.com] On
Behalf Of Geoff Hardin
Sent: Tuesday, May 18, 2004 5:53 PM
To: toasters
Subject: NDMP backup speeds
Toasters,
What is the general consensus for NDMP backup speeds? I have four older
F760Cs that are getting about 5-6 MB/s to local tape drives. The problem is
that I also have another nine filers (1 F630, 1 F720, 1 F740, 6 F760C) that
are
backing up via 3-way NDMP and we are lucky to see 4-5 MB/s; most are in the
1-2
MB/s range. And don't even get me started on the
Solaris/SunOS/Linux/HP-UX/DEC
clients that backup through the drives attached to the filers (0.1 - 2
MB/s).
We were looking at upgrading the tape drives and such, but we have done
a
few test dumps from filer to filer, filer to LTO-2, and filer to LTO-2
attached
to a Sun, and the numbers didn't improve much (definitely not enough to
justify
buying a new tape library / tape technology).
Just a little background:
We are using DLT7000 tape drives, which should have a maximum through
put of
about 10 MB/s (2:1 compression), contained in a Quantum P3000 library. We
have
all our filers on two separate networks; one for general data sharing and a
private one for our backups. The private network is all GbE (fibre) using
the
Alteon GbE cards (Gigabit Ethernet Controller II).
We are doing qtree dumps, and while some of the filers have only four
qtrees
per volume, others have over 40. Each qtree is generally capped at 200 GB
max,
and for those filers that have lots of qtrees, we still try to limit each
saveset to around 200 GB.
So, I guess what I'm really asking is 1) "What kind of speeds are you
seeing?" and 2) "Am I doing something wrong?"
Many thanks,
Geoff Hardin
geoff.hardin(a)dalsemi.com
Difficulty is the excuse history never accepts.