From: Jonathan Fosburgh (syjef@MAIL.MDANDERSON.ORG)
Date: Wed Dec 03 2003 - 16:04:16 EST
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On Wednesday 03 December 2003 11:37 am, Yi XIE wrote:
> Dear All,
>
> When I use Shark, I always use Vpath. But now I use AIX 5.2 which
> default use MPIO(but I can also use Vpath in AIX5.2). But I found that
> MPIO hasn't takeover function which belongs to Vpath. During the test,
> when I disconnect a fiber channel, the I/O cannot switch to another fiber
> channel. Does anyone know if this sympton is true? Thanks.
>
Well, first of all SDD and MPIO cannot coexist. Second, MPIO for 2105
requires a special version of 2105.rte (available from storage.ibm.com) that
cannot coexist with the 2105.rte for SDD. With those two points out of the
way, here are the issues as I am familiar with them. Native MPIO is not as
flexible as SDD, the way it handles load-balancing is strictly round-robin,
but I think that SDD defaults (on AIX) to a different algorithm. More
importantly, according to support, MPIO does not currently support concurrent
code loads on the Shark. That killed using MPIO for us. I was looking at it
for my new systems until I found out about that.
- --
Jonathan Fosburgh
AIX and Storage Administrator
UT MD Anderson Cancer Center
Houston, TX
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