Concerning strip-size. What are the considerations for that? Any reason
not to chose the largest? Seems that at sizes up to 1MB, the larger the
For direct I/O (which is what the RAID controller would be doing to
it's disks, seems a larger write would be better).
Would I be naïve to assume that if a RAID controller only needed to
update 1 block, it wouldn't need to update the entire strip?
Would there be a benefit in running a smaller strip size?
I know when I can control the hard disks, I can enable their write caches,
so having them do physical writes the keep their write buffers saturated
would optimize write performance, at least, but if it's a BIOS or hardware
controlled RAID, I don't know if I'd have the option to turn the disk's
write buffer on or off. So that likely wouldn't matter much.
Ideally, I think, it be optimal if a RAID controller (hardware or software)
really knew the the layout of the data on disk -- as in sectors/track.
Then it really might be able to interleave tracks among disk units (unless
all the tracks can be written contiguously w/no delay, then I'd guess there'd
be no benefit...oh well..
But how does one decide a strip size for RAID disks?
What criteria does one use?