I'm still using NB 5.1, but I assume these settings are still valid in
6. Have you tried creating/adjusting the parameters (adjust for Windows
paths):
../netbackup/db/config/SIZE_DATA_BUFFERS_DISK
../netbackup/db/config/NUMBER_DATA_BUFFERS_DISK
If I recall, the staging process still requires netbackup to buffer the
data in memory just like a normal client backup. It's not just a simple
device to device copy operation.
DC-
>-----Original Message-----
>From: veritas-bu-bounces at mailman.eng.auburn.edu [mailto:veritas-bu-
>bounces at mailman.eng.auburn.edu] On Behalf Of Paul Keating
>Sent: Friday, September 15, 2006 10:16 AM
>To: veritas-bu at mailman.eng.auburn.edu
>Subject: Re: [Veritas-bu] LTO3 performance
>
>
>> -----Original Message-----
>> From: ewilts at ewilts.org [mailto:ewilts at comcast.net]
>
>>
>> I apologize for top-posting, but this web client really sucketh...
>
>Bah, I'm a top-posting vigilante, even though I come from a usenet
>background.
>;o)
>
>> You'll note in my posting that I am having performance
>> problems *destaging*. These files are typically large. As I
>> said, I've set the fragment size to unlimited.
>
>That why I mentioned it when Simon asked "What sort of files are backed
>up? Large or a lot of small files?"
>
>> I obviously don't have a network problem since I'm going
>> directly from a local SAN-attached disk to a SAN-attached
>> tape drive. I can dd from the DSSU at 140-170MB/sec which is
>> about what I'd expect on a 2Gbps FC port.
>
>DD to where? Have you tried DD to a local (non-SAN) device, like a
local
>filesystem that is either local to the box, or at least direct
connected
>FC, but not connected via the same HBA?
>Have you tried tar/cpio from DSSU direct to a tape? Are your DSSU and
>tape drive connected via the same HBA? Different HBA? Different port on
>same HBA?
>
>Is disk connected to a HBA in a 66MHz slot, and tape connect to a HBA
in
>a 33MHz slot?
>
>Obviously, a tar direct to tape will give you a good idea of the path
>throughput without involving Netbackup.
>
>
>Paul
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