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March 15th, 2010 14:00
Matching block size with CLARiiON.
Our Oracle database writes in the default 8 KB size. I typically set my physical partition size to a multiple of this when creating a volume in AIX. As is now, 64 MB.
The file system writes in 512 KB chunks - I always take the default.
Now, on the CLARiiON, I'm going to hit the CACHE first and then the CLARiiON writes to disk.
Is there an optimal that I can set physical partition size to on the volume? Has anyone else had to work with this on an AIX system and would share their experiences?
Thank you,
Erick
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March 16th, 2010 01:00
The best practice recommends to use the default if you have a mixed environment with for example Windows, VMware and other systems. If only 1 particular IO size is used, like your AIX on 8kB blocks, you can set the cache block size to 8kB as well. If your Exchange mailserver uses 4kB blocks and 4kB is the only (or majority) blocksize that will be used, set it to 4kB. For backup apps in general 16kB could win a few minutes in performance during the nightly backups (I actually tested this, but found the gain way too low to actually start using my script to set the cache size to 16kB during the night and back to 8kB during office hours).