Hi, you have not told the type of TSM-server you are using, but I guess it maybe is AIX since you already have purchased the disk system from IBM. If you use another OS, ignore the rest of this e-mail as other methods for spreading IO apply(methods I know little about).
However, for AIX you can easily randomize the load by using Physical Partition Striping: Share out your LUNs to the AIX box in following order. Host-LUN n, from Array Group 1 Host-LUN n+1, from Array Group 2 Host-LUN n+2, from Array Group 3 Host LUN n+3, from Array Group 4 and start all over with Host-LUN n+4, from Array Group 1 Host-LUN n+5, from Array Group 2 ... etc. Then create your volume group with a certain Physical Partition Size(for example 1024MB). Create your Logical Volumes before creating your filesystems. Make it span the physical volumes in the VG (Range of physical volumes=Maximum in SMIT). Make your filesystem on top of the logical volume you just created and you're there. A 4 G or larger file(stg volume) on your filesystem will now spread across LUNs on all of your disk arrays. The above method will randomize IO when having multiple processes for read and write. It will therefore increase the chance of having an evenly spread but hot spots may occur anyway. If you detect hot spots that persist over a longer period, you can online migrate logical volumes away from the affected physical volume using "migratepv". Best regards Hans C. Riksheim -----Original Message----- From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On Behalf Of Pretorius, Louw <[EMAIL PROTECTED]> Sent: Thursday, November 09, 2006 10:59 AM To: [email protected] Subject: Spreading load across SAN Arrays Importance: High Hi, We have configured our DS4100 with 4 arrays of 4+1(RAID5) with large blocksizes etc in accordance with BestPractise. My question is: How do I spread the Stg volumes across the volumes so TSM will spread the load ? Regards Louw Pretorius _______________________________ Informasie Tegnologie Stellenbosch Universiteit There are only 10 kinds of people in the world: Those who understand binary and those who don't <html><body><br /><br /><br /><font face="Arial" size="1"><hr>This email originates from Steria AS, Biskop Gunnerus' gate 14a, N-0051 OSLO, http://www.steria.no. This email and any attachments may contain confidential/intellectual property/copyright information and is only for the use of the addressee(s). You are prohibited from copying, forwarding, disclosing, saving or otherwise using it in any way if you are not the addressee(s) or responsible for delivery. If you receive this email by mistake, please advise the sender and cancel it immediately. Steria may monitor the content of emails within its network to ensure compliance with its policies and procedures. Any email is susceptible to alteration and its integrity cannot be assured. Steria shall not be liable if the message is altered, modified, falsified, or even edited.</font></body></html>
