Hi,

Problem:  Migrate/Copy jobs from disk pool (DiskBackup)
to tape (DiskCopy) only get overall speed of 10-20MB/s.

full backup job size varies from 10-50GB.

Pool setup is simple, just one pool for full an incremental backups
to disk (automatic recycle works good)

Pool {
  Name = DiskBackup
  Pool Type = Backup
  Recycle = yes
  RecyclePool = DiskBackup
  AutoPrune = yes
  Volume Retention = 15 days
  Volume Use Duration = 6 days
  Maximum Volume Bytes = 4G
  Label Format = Backup-
  Next Pool = DiskCopy
}

DiskCopy pool goes to LTO4 tape device.
DiskBackup goes to SATA external raid (6T ext3).

concurrency for DiskBackup jobs is 15,  jobs are spread
over DiskBackup Valumes (maybe thats the main problem)

i can read write/continuous on both devices at about 70MB/s
(SATA is not fast)

i tried spooling to local SAS raid, but overall speed is lower
than direct writing to tape.
despooling from SAS raid to Tape runs at Tape maximum spped.



I need some Performance tuning tips, maybe:

Limit jobs per Volume in DiskBackup pools?
Split DiskBackup into DiskFull and DiskIncr pools?

Pool {
  Name = DiskFull
  Pool Type = Backup
  Recycle = yes
  RecyclePool = DiskFull
  AutoPrune = yes
  Volume Retention = 15 days
  Volume Use Duration = 6 days
  Maximum Volume Jobs = 1
  Maximum Volume Bytes = 10G
  Label Format = Full-
  Next Pool = DiskCopy
}


Thx
Ulrich
-- 
Ulrich Leodolter <ulrich.leodolter AT obvsg DOT at>


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