topic fbackup tuning in Operating System - HP-UX

fbackup tuning

Martin Wells — Mon, 15 Mar 2004 09:53:49 GMT

We have several L-2000 servers running HPUX11i with quatum DLT4000 DLT drives. Does anyone know what the best fbackup parameters are for improving performance??

Thanks

Re: fbackup tuning

Steven E. Protter — Mon, 15 Mar 2004 10:01:17 GMT

I don't actually know you can do a whole lot with fbackup to improve performance.

The best bet is machine setup. HAve those tape drives as the only device on a scsi chain, not on the same chain as disks.

Thats the best idea I know of.

SEP

Re: fbackup tuning

Alzhy — Mon, 15 Mar 2004 10:06:20 GMT

If you are pushing 4-5 Megabytes/sec to the DLT drives - then be thankful. If approaching (or hitting 6-8) -- be even more thankful -- that means your HW compression is kicking in.

If you see these figures.. then there is virtually nothing more that you can do - except faster tape-drives (newer DLT's or LTO) AND faster hard-drives...

Re: fbackup tuning

Chris Wilshaw — Mon, 15 Mar 2004 10:07:16 GMT

You need to look at the -c option of fbackup

We use the following on (L1000's with DDS3 drive)

blocksperrecord 64
records 64
checkpointfreq 32
readerprocesses 6
maxretries 10
retrylimit 5000000
maxvoluses 100
filesperfsm 200

All the options are detailed on the fbackup man page.

Re: fbackup tuning

Darren Prior — Mon, 15 Mar 2004 10:40:02 GMT

Hi,

Please read the warning on the fbackup man page regarding tuning. Increasing the backup performance should be balanced against good recovery performance ;-)

regards,

Darren.