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1 robstah commented Permalink

How do you measure the amount of memory used by the various adapters in the VIO server. <div>&nbsp;</div> SVMON and PS commands don't show really any memory in use by the various devices, in fact they suggest that no memory is in use at all. <div>&nbsp;</div> Above you suggest that with the 8Gb FC adapters you should increase memory to 4GB (which we did), but not why. How do you track how much memory the FC adapater is using??

2 robstah commented Permalink

In other words, when I compute out the computational memory on any and all of my VIO servers ( I have many of them) they all come back with the same amount, about 1.5GB. <div>&nbsp;</div> I derive computation memory by running vmstat -v, taking the total number of pages, subtract the free pages, and then subtract the numclient \ numperm %. That should tell you all of the pages that are in use by real processes, and not filecache. <div>&nbsp;</div> But it looks like this calculation doesn't take into account overhead space needed by adapters etc. <div>&nbsp;</div> We have been having issues with our VIO servers running out of memory, and support is struggling with how to compute the amount of memory really needed for a VIO. What numbers should I consume to properly adjust the sizing. <br /> Above you gave us a good starting point, but now we need the next step. <div>&nbsp;</div>

3 BenjaminBudts commented Permalink

Great stuff, will surely think about this next time I install a VIOS. You also use the principle of "keep it simple and stupid"... VIO server can confuse many unix adepts ;-). It is the darkest side I've been to in *nix land so far.

4 Eugen commented Permalink

The caveat respect to the 8Gbps SAN is also true when configured as NPIV? I thought in that case all traffic is routed directly to the Adapter of the LPAR. Or is it nevertheless necessary (e.g. for the overhead of that routing)? <br /> Thanks...

5 nagger commented Permalink

Eugen <br /> The LPAR Adapter is virtual - you have to buffer the SAN packets as they arrive or drop them. This is not really an overhead.