arcserve backup speed < 25 mbs 2

[Guest_imported]

our backup speed is much less than 25MB / min ie 1 mb /min
we have correct network performance and config > 400 mb / min and know all about duplex and auto negotiation setting
The netware server hoggs CPU time once astart is run
any tips please

 

[ARCserveGuru]

If your backing up netware, then try using "lock mode if deny write fails".

guru

 

[dunck]

"lock mode if deny write fails" has already been selected, we need to dig further.

 

[dunck]

Have applied SP Qo05996 and Qo06781. Backing up a suitable directory on the tape server now gets us to 25 MB/min. The tape spec says 60 MB/min. Is the Arcserve 7 software that bad???. We can do a disk-disk copy at around 500 MB/min across the network.

 

[BillHicks]

You dont mention what software or kit you're using but I had a problem solved for me that may assist you. I've installed NT Arcserve2000 and 4 NT Arcserve 2000 Clients connected via ethernet and found the fastest throughput we could get from the clients is 1MB/Min which is completely unusable. It seems one of the defaults on install for 2000 clients sets the throughput incorrectly.

The key was
HKEY_LOCAL_MACHINE\SOFTWARE\COMPUTERASSOCIATES\ARCSERVEIT\CLIENTAGENT\PARAMETERS\SetWSSendBuff <Change from 1 to 4096>

Our throughput went from 1MB/Min to 350MB/Min.

If your using Netware, look for something similar in the configs. Good luck!

 

[dunck]

Having spent another couple of days searching and tweaking!!

The following proceedure will help to identify problems and improve performance.

1. Run a short backup (50-100 MB)Note the MB/min.
2. Repeat but enter the following on the server console command line - &quot;TAPESVR DISABLE WRITES&quot; as soon as the backup has started. (use RCONSOLE ). Note the MB/min.

If 2 > than 1 then the SCSI system need to be looked at.
If 2 = 1 then the Arcserve software performance may need to be improved by tuning.

eg for our system:-
1. 25 MB/min
2. 66.6 MB/min

Arcserve can provide the data but not getting to the tape quick enough.

I did also look at tuning briefly

add &quot;BUFFER=20&quot;
to the TAPESVR.CFG file AFTER the line following NLM1

Example

[NLM]
NLM1 = STANDARD GROUP-ARCSERVE BOARD-BOARD0 SCSIID-1
BUFFER=20

This gave 133.2 MB/min for test 2 - not an insignificant improvement. Increasing further reduces the speed. See TID 10023910 for more info.

Hope this helps some of you Arcserve users out there!!

Our system:- Novell 5.0 SP6a
WinNT4 using Novell 4.8 client


Now why doesn't my SCSI system go too well???