I have two pSeries p650 connected to one SSA 7133-D40
Every p650 has two "ADVANCED SERIALRAID PLUS ADAPTER".
Both p650 are members of HACMP 4.5
Currently I have mirror drives created on AIX level.

My question : Is it possible to create RAID5 on "ADVANCED SERIALRAID
PLUS ADAPTER" and safely use this RAID5 inside Shared Volume Group in
HACMP4.5.

Is it true that I can create RAID5 only on one of my four "ADVANCED
SERIALRAID PLUS ADAPTER"'s and if this adapter fails other adapters
will not know about RAID5 created on failed adapter.
Or may be I can do something to let all my "ADVANCED SERIALRAID PLUS
ADAPTER"'s share information about RAID5 created on one of them.

Vasyl Lazarenko wrote:
> I have two pSeries p650 connected to one SSA 7133-D40
> Every p650 has two "ADVANCED SERIALRAID PLUS ADAPTER".
> Both p650 are members of HACMP 4.5
> Currently I have mirror drives created on AIX level.
>
> My question : Is it possible to create RAID5 on "ADVANCED SERIALRAID
> PLUS ADAPTER" and safely use this RAID5 inside Shared Volume Group in
> HACMP4.5.
>
> Is it true that I can create RAID5 only on one of my four "ADVANCED
> SERIALRAID PLUS ADAPTER"'s and if this adapter fails other adapters
> will not know about RAID5 created on failed adapter.
> Or may be I can do something to let all my "ADVANCED SERIALRAID PLUS
> ADAPTER"'s share information about RAID5 created on one of them.

The rules here are that if you have a RAID array defined on some disks
in an SSA loop (1) all the disks must be on the same loop and (b) you
can have a maximum of two adapters on the same loop. If you have two SSA
RAID adapters in the same loop, then the RAID cache is mirrored between
them automatically, so if one fails the other can takevoer without loss
of data.

"Simon Marchese" <sjm_news@yahoo.co.uk> wrote in message
news:cd8181$kmh$1@hercules.btinternet.com...

> The rules here are that if you have a RAID array defined on some disks
> in an SSA loop (1) all the disks must be on the same loop and (b) you
> can have a maximum of two adapters on the same loop. If you have two SSA
> RAID adapters in the same loop, then the RAID cache is mirrored between
> them automatically, so if one fails the other can takevoer without loss
> of data.

Simon, thanks for answer.

I have only one loop, two AIX systems, four adapters and HACPM 4.5 cluster.
Every system has two adapters.
So I can not use RAID array because I have four adapters (two system with
two adapters in every system)
I can only use AIX mirroring on AIX level.
But AIX level doesn't allow me to create RAID5 and I have shortage of space
in cluster.
I thougt I can brake two AIX level mirror and create RAID5 on SSA RAID
adapter level.

Is there any way I can do this without buying new hardware ?