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[Networker] Disk backup
2006-05-17 11:17:35
Good morning to all,
We recently acquired an DELL/EMC AX100i storage array with 12x 500GB SATA
drives with 2 SPs (storage processors). Each SPs are directly connected to my
Linux server using GB NICs.
First or initial config is 2x 1.3 TB virtual disks on RAID 5, the backup
throughput is only 10 to 15 MB/s. In the hope of improving the backup speed, I
re-created the virtual disks, this time I sacrificed capacity by using RAID
1/0. Able to create 2x 1.3TB virtual disks using all the 12 disks.
The backup throughput improves a bit if I'm just using/writing on one of the
virtual disk, but if I use them concurrently, the throughput slows down to 10
to 15 MB/s again.
Don't now why, but somehow LTO-2 tape drives throughput (15 to 20 MB/s) is a
lot faster than disks and also when I'm cloning the savesets on the disk to
tapes, the throughput is on average of 5 MB/s to 10 MB/s only. The data is
already on local disk and throughput should be a lot faster, but this is not
case in here.
Environment: Dell PowerEdge 2850 server with 2x 3.8 GHz processor and 4GB RAM
O/S: Red Hat Linux ES 3 kernel 2.4.21-32.0.1.ELsmp
Networker server: v7.2.2
Any advise, suggestions or explanation is greatly appreciated.
Librado Pamintuan
Technical Support Analyst II
Information Systems Dep.
Operations Group
City of Regina
Phone: (306) 777-7573
General Fax: (306) 777-6804
eFax: (306) 546-6002
eMail: lpamintuan AT regina DOT ca
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