AIX SDD & MPIO Comparison (Pros Cons)

[applejuice]

Greetings. some of the tech people in my company are considering switching from SDD to MPIO for multipathing. I'm not sure if its a good idea, so I was doing a bit research on the web and ran into some user's experiences (not a lot) such as SDD and MPIO cannot coexist, native MPIO is not as flexible as SDD the was it handles load balancing (inferior algorithm?), MPIO does not support concurrent code loads and so forth.

I need more technical/high-level details on this matter. So do you think we can discuss this issue futher as to the pros and cons of both these technology and get a better understanding where we are at and where we want to get.

 

[p5wizard]

My understanding is that MPIO together with the SDDPCM path control module is equivalent to plain SDD, with regard to load balancing and path failover. Also concurrent DS/ESS LIC upgrades should be survivable with either SDD or MPIO/SDDPCM. But I'll look into it further.

MPIO with the native "other FC" PCM is not as flexible.


HTH,

p5wizard

 

[RMGBELGIUM]

Mpio has one disadvantage : performance reporting ...
with sdd you have the essmap command to retrieve stats from your ranks,... with mpio there's nothing


rgds,

R.