On Mon, 21 Aug 2006 at 5:28pm, Cyrille Bollu wrote
For the record my BOT system is made of:
1) 1 Dell Poweredge 2850 with 1 1.4TB RAID5 array made of 6 U320 SCSI
HD
What RAID controller? Have you benchmarked the array itself with
something like bonnie++ or tiobench?
2) 1 Dell Powervault 110 LTO3 tape drive
3) Redhat ES 3.3
4) Amanda (amanda-2.4.4p1-0.3E)
Is your tape drive on its own controller?
5) Use the holding disk feature.
As you suspected, you don't want to do that in this case.
6) Recompile Amanda and raise the tape record size
You *do* want to do this. When I first got my LTO3 library, I did some
performance tests with tar and varying blocksizes. I found that bigger
generally was better. 'tar -b 64' (which equals amanda's default 32KiB
blocksize) got me 41MiB/s, but 'tar -b 4096' got me 60MiB/s. So I now use
a 2MiB blocksize.
7) increase the server's TCP/IP MTU?
This will have no effect. All traffic is local, so it'll be going over lo
and not any eth device.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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