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:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Pretorius, Louw <louw AT sun.ac DOT za>
Sent: Thursday, November 09, 2006 10:59 AM
To: ADSM-L AT VM.MARIST DOT EDU
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
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