[storage-discuss] COMSTAR & block devices...

[Sumit Gupta]

>The heart of what I've discovered is that COMSTAR picks a block size based on the device behind it, and appears to *always* >issue IOs using that block size, no matter what the size of the requests coming in across the wire.  If the block device is >zvol, it uses the zvol record size, which makes sense.  If the block device behind it is a physical disk, or SVM volume, it >picks 512 bytes as the block size.

Do you mean the I/O to the COMSTAR's backend ? Or the blocksize of the device exposed to the SAN ?

Sumit
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