RE: Disk storage - iSeries/Windows/UNIX -- MIDRANGE-L

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On Tue, 22 Mar 2005, Graap, Ken wrote:

The more I think about this why would it even matter what the block size is
for an iSeries controlled disk?

The "virtual" disk space or REAL disk allocated to a UNIX partition would be
formatted and controlled by the OS running in that parturition (AIX or
Linux).

I guess this all depends on whether or not linux or AIX has direct access to the hardware or if they are "hosted" by OS/400. If hosted, they get all the disk info (size, blocksize, striping, etc.) from OS/400 and not from the disk itself. In which case making the filesystems should probably use whatever OS/400 presents to it. If they have direct access to the hardware, then use the blocksizes that the hardware best supports. If you don't use RAID, then any blocksize is probably ok. But most RAID controllers read and write in a certain blocksize and setting your filesystem to use the same blocksize will result in the best performance.

James Rich

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