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@dalsemi.com
Difficulty is the excuse history never accepts.
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@dalsemi.com
Difficulty is the excuse history never accepts.