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Hey gang,

I have new EMC disk presented to my 4.3.3 ML 11 beast, each device is
visible to 2 HBAs for redundancy. Can someone point me in the right
direction to show how multipathing is handled within AIX/LVM? Right
now I see each Symm device as 2 disks:

/dev/rhdisk31 :EMC :SYMMETRIX :5670 :38000000 :8838720
/dev/rhdisk32 :EMC :SYMMETRIX :5670 :38001000 :8838720
/dev/rhdisk49 :EMC :SYMMETRIX :5670 :38002000 :8838720
/dev/rhdisk50 :EMC :SYMMETRIX :5670 :38003000 :8838720
<snip>
/dev/rhdisk159 :EMC :SYMMETRIX :5670 :38000000 :8838720
/dev/rhdisk160 :EMC :SYMMETRIX :5670 :38001000 :8838720
/dev/rhdisk161 :EMC :SYMMETRIX :5670 :38002000 :8838720
/dev/rhdisk162 :EMC :SYMMETRIX :5670 :38003000 :8838720

Doh.

Thanks in advance for any assistance. I've inherited a couple of AIX
boxes and my company is too cheap to increase headcount. *SIGH*
Daryl

Check out EMC Power Path software

"gprimerib" <hmprimerib@hotmail.com> wrote in message
news:1110221547.917459.309850@f14g2000cwb.googlegr oups.com...
> Hey gang,
>
> I have new EMC disk presented to my 4.3.3 ML 11 beast, each device is
> visible to 2 HBAs for redundancy. Can someone point me in the right
> direction to show how multipathing is handled within AIX/LVM? Right
> now I see each Symm device as 2 disks:
>
> /dev/rhdisk31 :EMC :SYMMETRIX :5670 :38000000 :8838720
> /dev/rhdisk32 :EMC :SYMMETRIX :5670 :38001000 :8838720
> /dev/rhdisk49 :EMC :SYMMETRIX :5670 :38002000 :8838720
> /dev/rhdisk50 :EMC :SYMMETRIX :5670 :38003000 :8838720
> <snip>
> /dev/rhdisk159 :EMC :SYMMETRIX :5670 :38000000 :8838720
> /dev/rhdisk160 :EMC :SYMMETRIX :5670 :38001000 :8838720
> /dev/rhdisk161 :EMC :SYMMETRIX :5670 :38002000 :8838720
> /dev/rhdisk162 :EMC :SYMMETRIX :5670 :38003000 :8838720
>
> Doh.
>
> Thanks in advance for any assistance. I've inherited a couple of AIX
> boxes and my company is too cheap to increase headcount. *SIGH*
> Daryl
>

Hi Doug,

Thanks for replying. Yeah, PP was my original thought. But the other
admin here (old HP-UX, & I'm the Solaris guy) thought that AIX had a
native method of handling multiple paths. Sounds like he was wrong.
I'll just configure it over a single path then.

Thanks for the reply.
Daryl

gprimerib wrote:
> Hi Doug,
>
> Thanks for replying. Yeah, PP was my original thought. But the
other
> admin here (old HP-UX, & I'm the Solaris guy) thought that AIX had a
> native method of handling multiple paths. Sounds like he was wrong.
> I'll just configure it over a single path then.
>
> Thanks for the reply.
> Daryl



No, Power Path will provide multi path I/O, and load balancing for you.
Forget about the hdisks you see. Power Path will combine the hdisks
into a single hdiskpower volume. It is the hdiskpower volume you will
present to AIX as a physical disk, to be put in a volume group. All
your management will be of hdiskpower volumes in LVM.

Doesn't IBM have a product similar to PowerPath? It's an add-on I
believe.

Regards
Daryl

If you are talking about SDD, that is for IBM storage not EMC.
If you want load balance and multipathing, you will need to fork out the big
bucks for power path.

"gprimerib" <hmprimerib@hotmail.com> wrote in message
news:1110224613.504598.193240@f14g2000cwb.googlegr oups.com...
> Doesn't IBM have a product similar to PowerPath? It's an add-on I
> believe.
>
> Regards
> Daryl
>

Man, I bet that's what my partner was thinking of:

dpo.ibmssd.rte.432 1.2.0.0 C IBM Subsystem Device
Driver

We're dumping the old ESS storage, hence the new EMC stuff I'm playing
with. I have powerpath on most of my Sun equipment so I'll just
request another license for this sucka.

Thanks.
Daryl

gprimerib wrote:

> Doesn't IBM have a product similar to PowerPath? It's an add-on I
> believe.

MPIO, but not with 4.3.3.

--
Michael Prix
Don't drink as root!