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second autoraid 12H controller card

james gould
Frequent Advisor

second autoraid 12H controller card

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

A. Clay Stephenson
Acclaimed Contributor

Re: second autoraid 12H controller card

Hi James:

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

See this thread:

If it ain't broke, I can fix that.
Occasional Advisor

Re: second autoraid 12H controller card

Autoraid controllers do this automatically
Why is abbreviation such a long word?
Honored Contributor

Re: second autoraid 12H controller card

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
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.

It works for me (tm)