second autoraid 12H controller card

[james gould]

How to configure the second controller card
to balance out the load and increase performance on an autoraid 12H?

[A. Clay Stephenson]

Hi James:

I've actually answered this question a number of times:

See this thread:
http://forums.itrc.hp.com/cm/QuestionAnswer/1,11866,0x5b6187dc4d7dd5118ff00090279cd0f9,00.html

Clay

[Error_1]

Autoraid controllers do this automatically

[Bill McNAMARA_1]

You need to configure lvm primary paths and alternate paths wisely through each controller.

For example access half your luns through controller X and the other half through controller Y.

strings /etc/lvmtab
and
ioscan -fnkCdisk
to find out which ones are going through which controller.

arraydsp -c
gives you information on the controller ids.

It is a good idea to make sure there are two busses to the autoraid or else that won't make much of a difference at all.

ie cXtX through controller X
cYtY through controller Y

cXtX and cXtY will give nothing special in terms of perf.


Your 12H would look like this for example

8/12 ----- controller X id 3

8/8 ----- controller Y id 4

8/8.4.0 lun 0 through Y
8/12.3.0 lun 0 through X

so access some luns through X and some through Y with lvm vg creation. When a controller/scsi card fails, the lvm alternate path can be used, once you configured it in lvm.


Thats the rule.

Bill