Have you tried running IOMETER on the hosts? Draw out your data flow and look
at parameters.
________________________________
From: Legato NetWorker discussion on behalf of Librado Pamintuan
Sent: Wed 5/17/2006 9:47 AM
To: NETWORKER AT LISTSERV.TEMPLE DOT EDU
Subject: Re: [Networker] Disk backup
What's the size/capacity of your virtual disk? I'm thinking of creating just 1
big/huge 2TB virtual disk so that I can eliminate any possible conflict in
using 2 virtual disk which might be causing the performance issue.
>>> shawn.cox AT PCCA DOT COM 17/May/2006 9:28 am >>>
Welcome to SATA.
I have a Dell NAS device 745N that has the same problem. I have a 4 drive
RAID 5 Virtual Disk that only gets about 9MB/sec transfer in and out. I've
rebuilt it many times. After multiple calls to Tech support they acquiesce
that it is normal. Appalling IMO, as I get better throughput to other
drives across the LAN.
Only thing I can figure is that SATA is about very cheap, very large
capacity and nothing about performance.
I still don't believe it as SATA's theoretical specs put it above 100MB/sec.
I just can't seem to locate where the bottleneck is in my situation. Will
watch this thread and hopefully someone has an answer.
--Shawn
--------------------------------------------------
Server and Storage Administrator
Plains Cotton Cooperative Association
Lubbock, Texas
(806)763-8011
--------------------------------------------------
-----Original Message-----
From: Legato NetWorker discussion [mailto:NETWORKER AT LISTSERV.TEMPLE DOT EDU]
On
Behalf Of Librado Pamintuan
Sent: Wednesday, May 17, 2006 10:11 AM
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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