Quinton Jansen wrote:
What speeds are others getting when using an LTO-3 drive?
If I'm reading the numbers correctly, 2GB in 13 minutes (10GB/hour) is way too
slow (should be around 200G/hour).
I've got a brand new Quantum Superloader-3, LTO3 attached to a dedicated SCSI
bus on a HP DL/380, running bacula 1.38.5, compiled from source.
************************************************************
tapeinfo -f /dev/sg0
************************************************************
tapeinfo -f /dev/sg65
Product Type: Tape Drive
Vendor ID: 'HP '
Product ID: 'Ultrium 3-SCSI '
Revision: 'G24W'
Attached Changer: No
SerialNumber: 'HU10538AML'
MinBlock:1
MaxBlock:16777215
SCSI ID: 1
SCSI LUN: 0
Ready: yes
BufferedMode: yes
Medium Type: Not Loaded
Density Code: 0x44
BlockSize: 0
DataCompEnabled: yes
DataCompCapable: yes
DataDeCompEnabled: yes
CompType: 0x1
DeCompType: 0x1
Block Position: 8593513
Simple test (single tape) selected.
Wrote Volume label for volume "TestVolume1".
Wrote Start of Session label.
16:44:34 Begin writing Bacula records to tape ...
Wrote blk_block=5000, dev_blk_num=4999 VolBytes=322,495,472 rate=2733.0 KB/s
Wrote blk_block=10000, dev_blk_num=9999 VolBytes=645,055,424 rate=2744.9 KB/s
Wrote blk_block=15000, dev_blk_num=14999 VolBytes=967,615,368 rate=2748.9 KB/s
Wrote blk_block=20000, dev_blk_num=4499 VolBytes=1,290,175,312 rate=2733.4
KB/s
Wrote blk_block=25000, dev_blk_num=9499 VolBytes=1,612,735,264 rate=2733.4
KB/s
We've got a HP DL/585, looks like same drive, dedicated SCSI-attached.
The lowest rate I saw on our simple btape fill was 58MB/sec. As for real
backup rates, various hosts give different speeds. With all four hosts
running 1.38.3 compiled from source, our most recent full backups gave
speeds of 34.6 (largest volume), 3.5, 14.4, and 5.3MB/s. The best I've
seen is in the 40s. None of this is using concurrent jobs or any
tweaking of settings, so hopefully this will improve a little once a bit
of effort is invested.
Cheers,
Greg.
--
- ---- -----
Gregory Orange Phone: +61 8 9387 7955
Systems Administator Fax: +61 8 9387 6686
MetOcean Engineers Pty Ltd http://www.metoceanengineers.com
System Administrators Guild of Australia http://www.sage-au.org.au
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