On Tue, Feb 10, 2009 at 11:24 AM, Steve Polyack <korvus AT comcast DOT net> 
wrote:
> (private) HKS wrote:
>>
>> I moved the catalog to a different server entirely, and the speeds
>> have not improved. What else can I dig into?
>>
>> -HKS
>>
>
> Test your raw network performance between your clients and your storage
> daemon.  Then test your network performance between clients and storage
> daemon involving your disks.  Ensure that you can reliably stream faster
> than the speeds you're seeing (1-1.5MB/sec).  Also, take a look into tuning
> PostgreSQL, although it doesn't seem like that is your problem.
>
> Steve Polyack


Thanks for the responses.

In answer to John's question, this is happening with all backup types
(Full, Incremental, Differential). I went through a lot of the
performance-related messages in the archives before emailing the list,
but didn't find much that was relevant. The most common problems
seemed to be crappy database performance (not my issue - the test case
I've been using is only hitting 30-40 files/230MB on its
Incrementals), using crappy hardware (not my issue as far as I can
see), and compression. A couple things I neglected to list in my first
message:
 - Turning off VSS has no effect on Windows backup speeds
 - My database has all three recommended indices, though I've not added any more


My server's network performance seems all right. Testing basic TCP
throughput with iperf, I'm showing an average of 880Mbps or so. FTP
downloads to this server hum along at about 85MB/s.

I remain baffled.

-HKS

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