Hello Chris,
Thanks for responding.
The PE 124T is connected externally to a SCSI card in a Dell T610.
I have 6 x 1 TB SAS drives in a Raid 5 array.
I haven't considered the transfer rates between the disks and the
drive, but clearly it could be an issue.
There is nothing else accessing the disks during a migration.
Your suggestions are good, but I'd like some advice on how to test the
above to get the statistics I need to narrow down the problem, and how
to interpret the statistics returned.
If someone has already done such tests on their own setup, and can
share commands and/or output, that would be great.
Pointers to recommended reading would be welcome also.
Thanks,
Dermot.
On 25 February 2011 18:02, Chris Geegan <dragonstone1020 AT gmail DOT com>
wrote:
> The data transfer rate seems much slower than the tape device supports.
> Approximately 1/6. Have you considered the interface from Server to Tape
> device, data transfer rates of internal storage (SAS vs SATA), and current
> disk I/O?
> Just throwing some ideas out there.
>
> On Fri, Feb 25, 2011 at 10:20 AM, Dermot Beirne <dermot.beirne AT dpd DOT ie>
> wrote:
>>
>> Hi,
>> I am using Bacula 5.0.3 on Ubuntu 9.04
>>
>> The length of time taken to migrate from disk to tape is causing
>> problems with my backup window.
>>
>> The Monthly full backups I run takes up to 3 days.
>>
>> Here is the output of one client:
>>
>> Build OS: i686-pc-linux-gnu ubuntu 9.04
>> Prev Backup JobId: 12473
>> Prev Backup Job: Livetest.2011-02-06_22.00.00_56
>> New Backup JobId: 12487
>> Current JobId: 12486
>> Current Job: Monthly-Disk-Tape-Migrate.2011-02-07_05.00.02_09
>> Backup Level: Full
>> Client: interlink-pdc-fd
>> FileSet: "interlink-pdc Fileset" 2009-09-17 18:04:55
>> Read Pool: "Monthly-Disk-Pool" (From Job resource)
>> Read Storage: "MonthlyStorage" (From Pool resource)
>> Write Pool: "Monthly-Tape-Pool" (From Job Pool's NextPool
>> resource)
>> Write Storage: "Tape" (From Storage from Pool's NextPool
>> resource)
>> Catalog: "MyCatalog" (From Client resource)
>> Start time: 07-Feb-2011 08:24:21
>> End time: 07-Feb-2011 19:36:13
>> Elapsed time: 11 hours 11 mins 52 secs
>> Priority: 20
>> SD Files Written: 5,654,088
>> SD Bytes Written: 768,958,410,352 (768.9 GB)
>> Rate: 19075.2 KB/s
>> Volume name(s): 000072L4
>> Volume Session Id: 258
>> Volume Session Time: 1295882384
>> Last Volume Bytes: 769,726,218,240 (769.7 GB)
>> SD Errors: 0
>> SD termination status: OK
>> Termination: Migration OK
>>
>>
>>
>> There are around 26 disk volumes to migrate for this job. Each is 50Gb.
>>
>> My drive is a Dell PowerVault 124T LTO4
>>
>> Can anyone suggest how best to go about troubleshooting this performance.
>>
>> Thank you.
>> Dermot.
>>
>>
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>
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