Okay so that multiplex test was user error. Didn't have "max streams per
drive" setup right. At 4 streams we saw 40MB/s, at 8 streams we see
50MB/s. But... we have a new problem. Within 1-2 minutes the I/O starts
dropping. At 3:00 minutes into an 8 stream job, we're down to 38MB/s.
Earlier when testing at 4 streams, we were 10 minutes in and I/O had
slowly dropped from 40MB/s down to 12MB/s.

What in the world is going on?

On 09/10/2010 01:41 PM, Nate Sanders wrote:
> 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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