Re: [Veritas-bu] NBU 6.5.6 client on FreeBSD 7.2 host

2010-09-10 14:42:03
Subject: Re: [Veritas-bu] NBU 6.5.6 client on FreeBSD 7.2 host
From: Nate Sanders <sandersn AT dmotorworks DOT com>
To: "Martin, Jonathan" <JMARTI05 AT intersil DOT com>
Date: Fri, 10 Sep 2010 13:41:51 -0500
Yes we are well aware of the limitations of NDMP and small files, thus
the reason we're looking at trying NFS w/ snapshots. Our NetApp 6040 is
peaking around 40-50MB/s but what the issue is right now is that we're
getting such low performance from this FBSD box via NFS.

I turned on multiplexing to 4, and we're still seeing only 3-4MB/s.

On 09/10/2010 01:03 PM, Martin, Jonathan wrote:
> I've tested NDMP on 6 differetnt arrays and it has never moved millions
> of small files well. We maxed out backup performance on our NetApp FAS
> 2xxx with 2 streams at approx 20MB/sec total.  We're hoping to test
> SMTape, which purportedly does a bit level dump of the entire array.  I
> haven't had a chance to test this yet, but according to NetApp it will
> get us our weekly full and drive LTO3. We'll then need to put some sort
> of forever incremental or snapshot backup in-between the SMTape dumps.
> -Jonathan
> -----Original Message-----
> From: veritas-bu-bounces AT mailman.eng.auburn DOT edu
> [mailto:veritas-bu-bounces AT mailman.eng.auburn DOT edu] On Behalf Of Nate
> Sanders
> Sent: Friday, September 10, 2010 12:22 PM
> To: veritas-bu AT mailman.eng.auburn DOT edu
> Subject: [Veritas-bu] NBU 6.5.6 client on FreeBSD 7.2 host
> Now that we made it to 6.5.6 we're able to start testing NFS performance
> from our NetApp VS NDMP. For the longest time we've done the backup of
> some 1 billion small image files off the NetApp via NDMP. This job
> usually took 1-3 weeks to complete a full sweep via NDMP.
> Since we have support for FBSD we thought we would try doing NFS via
> that client as Linux NFS is not as powerful as the BSD/Solaris variety.
> Well on our initial test of a small volume from the NetApp, we're seeing
> 2-4MB/s performance. Confirmed via bptm log. This is going straight to
> LTO4 tape, which usually backs up around 150MB/s. Logs show that the
> previous NDMP jobs from the NetApp we're doing around 40MB/s direct to
> two dedicated NDMP LTO4 drives.
> Supposedly multiplexing for NDMP will come to NBU 7.x shortly and we
> will test again with that in the future. Right now I am not multiplexing
> this NFS job but while looking in bptm I don't see the usual "waited for
> buffer" errors that would tell me that I _should_ increase it. Is it
> still likely multiplexing would increase the overall performance here?
> Is this a known issue with FBSD clients? Is there something else I
> should be looking at?

Nate Sanders            Digital Motorworks
System Administrator      (512) 692 - 1038

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