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.
On Tue, May 18, 2004 at 04:53:07PM -0500, Geoff Hardin wrote:
So, I guess what I'm really asking is 1) "What kind of speeds are you seeing?" and 2) "Am I doing something wrong?"
We're running AIT-2 and AIT-3 drives for our backups. Our F820 which has 2 AIT-2 drives direct attached gets 5-7MB/s on the tape drives. Our 3-way NDMP backups get 4-6MB/s. We have separate networks too but ours are 100Mbit (not GigE like yours).
We have an AIT-3 drive attached to a Solaris host running 3-way NDMP backups and on that one we see 5-7MBs. We should be seeing better perfomance on this one, but we have other configuration issues to sort out (all of our AIT-3 drives are getting effectively AIT-2 performance even when direct attach).
DLT drives are notorious for shoe-shining, 1-2MB/s would be expected if you're not streaming the drives.
I am getting 10MB/sec from a FAS250 back to a SUN V480 with netvault (all 1000BaseT) to local disk (staging). Then 50MB/sec off the disk to LTO II drives.
That is backing up off the mirror targets, not the original filers so they are pretty idle. But I can run the backups during the day off 3 filers at a time so so far I am happy.
Early days for this configuration though.
On Tue, May 18, 2004 at 04:53:07PM -0500, Geoff Hardin wrote:
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).
Regards, pdg
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Geoff wrote: "
Toasters, What is the general consensus for NDMP backup speeds? .....
So, I guess what I'm really asking is 1) "What kind of speeds are you seeing?" and 2) "Am I doing something wrong?"
"
We have F820, with three DLT8000 and two are direct attach to Filer. I see the most of my NDMP back up is 12MB/s. The average is for both running at the same time is about 8-10 MB/s. We do not have money to test out with NDMP over the network instead. Meaning redo out back up solutions. This is cost us on tapes and time, so we are happy with what we have for now.
Hope that help.
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Geoff Hardin -
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Peter D. Gray