I checked the configruration of the 2 GB NICs which are directly to connected
to each SP on the AX100i and they are set to:
Autoneg: on
Speed: 1000 Mb/s
Duplex: full
Not sure where to look in the Linux config to tweak this issue.
regards,
Librado
>>> o.hermansen AT TDCADSL DOT DK 17/May/2006 1:03 pm >>>
I do not know the exact source of your problem, but i could expect it had
something to do with network, maybe the old fixed/auto problem.
I have a DELL/EMC AX100, the SAN version with 12 * 300 GB drives, and my
backupserver is a DELL PE1600SC (cheap with fast bus), running Win2K SP4,
Networker 7.12, and I often see transferrates og 20, 25 or even 30 MB/sec in
peaks. But a sustained transfer rate of 20 MB/sec when writing to the AX100
is normal.
As I recall the AX100i is the ISCSI version of the storage array, so I guess
that yoy might hav network problems as a Linux/PE2850 combination should
outperform my setup.
By the way, I use AIT3 drives and get the same speed as your LTO drives, so
maybe it is somewherte in your Linux configuration the problem is ?
Ole Hermansen
Data Center Manager
Group IT
Hempel A/S
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On
Behalf Of Librado Pamintuan
Sent: 17. maj 2006 17:11
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: [Networker] Disk backup
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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