Hello,
I have bacula running on both recent Sun v20z / AMD64 and SunFire280R / SPARC.
I recently discovered a different Bacula behaviour on the two platforms, with same OS, same Bacula version and same SCSI tape devices.
- On v20z machines, the throughput of backups is generally around 4000-8000KB/s.
- On 280R machines, the throughput of backups is much slower: around 2000KB/s on self backup (same SD/Director machine as the FD), 6000KB/s when backing up other Solaris FD machines, 100-400KB/s when backing up other Windows FD Machines!
The low throughput happening when backing up the windows machines, causes the nightly jobs to finish too late (around 11AM) when these machines have a lot of GB of data.
So I checked for differences between the v20z and the 280R configurations, and discovered this strange thing:
- if I run "tapeinfo -f /dev/rmt/0" on a v20z, the first line shows "Product Type: Tape Drive".
- if I run "tapeinfo -f /dev/rmt/0" on a 280R, the first line shows "Product Type: Disk Drive".
How comes that the 280R returns such a wrong information?
May the slow throughput be a consequence of this wrong setting?
If not, what can be causing this slow throughput?
Thanks,
Gabriele.
I have bacula running on both recent Sun v20z / AMD64 and SunFire280R / SPARC.
I recently discovered a different Bacula behaviour on the two platforms, with same OS, same Bacula version and same SCSI tape devices.
- On v20z machines, the throughput of backups is generally around 4000-8000KB/s.
- On 280R machines, the throughput of backups is much slower: around 2000KB/s on self backup (same SD/Director machine as the FD), 6000KB/s when backing up other Solaris FD machines, 100-400KB/s when backing up other Windows FD Machines!
The low throughput happening when backing up the windows machines, causes the nightly jobs to finish too late (around 11AM) when these machines have a lot of GB of data.
So I checked for differences between the v20z and the 280R configurations, and discovered this strange thing:
- if I run "tapeinfo -f /dev/rmt/0" on a v20z, the first line shows "Product Type: Tape Drive".
- if I run "tapeinfo -f /dev/rmt/0" on a 280R, the first line shows "Product Type: Disk Drive".
How comes that the 280R returns such a wrong information?
May the slow throughput be a consequence of this wrong setting?
If not, what can be causing this slow throughput?
Thanks,
Gabriele.
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Gabriele Bulfon - Sonicle S.r.l. Tel +39 028246016 Int. 30 - Fax +39 028243880 Via Felice Cavallotti 16 - 20089, Rozzano - Milano - ITALY http://www.sonicle.com |
