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September 14th, 2009 06:00
Client session backup speed is slowing when more sessions are running
Hi All,
We are running Solaris 9 with NW 7.4.4 and experiencing what seems to be a problem but may well just be a "feature."
Client Parallelism is at 64 / drive target sessions at 12 .
We have one nic on the backup server set at 1000Mb/Full
We have 4 Fibre LTO3 drives on a PX720 Tape library.
The problem seems to be that when the number client sessions increase due the speed of each client seems to slow down as if it has a limited amount of bandwith to play with. Each client would normally run at 10Mb/s so if 5 clients were started then each one of these from the NMC sessions window seems to run alot slower perhaps at around 5Mb/s and would get even slower if more sessions were started.
On Friday our backups got slightly delayed and as a result alot of backups were running at less than 2Mb/s with a couple running at 10Mb/s then those running at 2 would seem to move up on the "priority" list and speed up eventually.
At this point I did run a bigasm test on one of our clients and it was running @ less the 3Mb/s.
I ran the test again when there was only 2 clients running and it went through between 15-25Mb/s.
Im not sure if im missing something obvious but this does seem strange unless there is a bottle neck which I suspect may be due to our single 1Gb nic but this is seen even with a few clients running.
any feedbackup appreciated..
Abid
We are running Solaris 9 with NW 7.4.4 and experiencing what seems to be a problem but may well just be a "feature."
Client Parallelism is at 64 / drive target sessions at 12 .
We have one nic on the backup server set at 1000Mb/Full
We have 4 Fibre LTO3 drives on a PX720 Tape library.
The problem seems to be that when the number client sessions increase due the speed of each client seems to slow down as if it has a limited amount of bandwith to play with. Each client would normally run at 10Mb/s so if 5 clients were started then each one of these from the NMC sessions window seems to run alot slower perhaps at around 5Mb/s and would get even slower if more sessions were started.
On Friday our backups got slightly delayed and as a result alot of backups were running at less than 2Mb/s with a couple running at 10Mb/s then those running at 2 would seem to move up on the "priority" list and speed up eventually.
At this point I did run a bigasm test on one of our clients and it was running @ less the 3Mb/s.
I ran the test again when there was only 2 clients running and it went through between 15-25Mb/s.
Im not sure if im missing something obvious but this does seem strange unless there is a bottle neck which I suspect may be due to our single 1Gb nic but this is seen even with a few clients running.
any feedbackup appreciated..
Abid
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ble1
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September 14th, 2009 08:00
DavidHampson
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September 15th, 2009 02:00
shaha2
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September 15th, 2009 03:00
ble1
4 Operator
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14.3K Posts
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September 15th, 2009 04:00
If you have Windows boxes make sure to turn off checksum offloading at driver level (if running gigabit cards). Also, auto negotiation may kill your performance.