I have a new LTO-4 library and LTO-3 tapes. I have changed the buffers
around and I am using a 1MB block size. The best I have been able to
get on a single client backup is 89MB/sec on a ~300GB backup to a LTO-3
tape.
I found that most of my clients max out at 25MB/sec. If backup 6
clients at a time/per tape drive I found that I had the smallest window
so far.
This would be from my catalog last night:
FileSet: "Catalog" 2007-12-15 22:10:00
Pool: "Daily" (From Job resource)
Storage: "Autochanger" (From Job resource)
Scheduled time: 19-Dec-2007 22:10:00
Start time: 20-Dec-2007 07:53:46
End time: 20-Dec-2007 08:40:59
Elapsed time: 47 mins 13 secs
Priority: 25
FD Files Written: 133
SD Files Written: 133
FD Bytes Written: 204,435,403,603 (204.4 GB)
SD Bytes Written: 204,435,421,328 (204.4 GB)
Rate: 72162.2 KB/s
Software Compression: None
VSS: no
Encryption: no
Volume name(s): AB8689L3|AP4125L3
Volume Session Id: 513
Volume Session Time: 1197472761
Last Volume Bytes: 441,911,430,144 (441.9 GB)
I should have my 1st batch of LTO-4 tapes in a couple of weeks. (I am
waiting on Custom labeled tapes).
-Jason
On Thu, 2007-12-20 at 18:05 +0100, Ralf Gross wrote:
> Michael Galloway schrieb:
> > out of curiosity, i'm wondering what other folks are getting for backup
> > rates
> > to LTO4. i seem to be getting these sorts of rates:
> >
> > local disk backups (3ware raid6 9650SE sata disks/xfs filesystem):
> > Elapsed time: 8 hours 22 mins
> > Priority: 10
> > FD Files Written: 432,602
> > SD Files Written: 432,602
> > FD Bytes Written: 1,038,925,243,806 (1.038 TB)
> > SD Bytes Written: 1,038,995,304,809 (1.038 TB)
> > Rate: 34492.9 KB/s
> >
> > linux client, (3ware sata raid 5, ext3):
> > Elapsed time: 1 day 37 mins 15 secs
> > Priority: 10
> > FD Files Written: 1,214,678
> > SD Files Written: 1,214,678
> > FD Bytes Written: 2,159,368,051,425 (2.159 TB)
> > SD Bytes Written: 2,159,551,222,342 (2.159 TB)
> > Rate: 24362.5 KB/s
> >
> > netapp client via nfs mount to bacula server:
> > Elapsed time: 18 hours 1 min 56 secs
> > Priority: 10
> > FD Files Written: 863,458
> > SD Files Written: 863,458
> > FD Bytes Written: 1,825,660,355,131 (1.825 TB)
> > SD Bytes Written: 1,825,879,267,061 (1.825 TB)
> > Rate: 28123.4 KB/s
> >
> > clients are all on local lan via gigE connections.
>
> For full backups I get 70-75MB/s write speed to LTO-4 tape. Spooling
> seems to make not much difference here. The overall backup speed
> (whole job) drops with spooling enabled, because it's asynchron for
> single jobs (spooling -> despooling -> spooling...). Therefor I don't
> use spooling for large jobs that run >20 hours.
>
> Are the above values with spooling or is this the 'Transfer rate' to
> tape?
>
> Ralf
>
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