On Thu, 2003-02-20 at 02:55, Daniel Brockhaus wrote: [snip] > One suggestion to speed up the reads was to issue several reads in > parallel. Silly me didn't think of that, I was completely focused on the > writes, which are more important for my application. Anyway. Using parallel > reads (from four processes), read performance scales almost with the number > of disks in the array. This goes for both, hardware and software RAID, with > software RAID being about 15% faster. > > Write performance on the other hand does not change at all when using > multiple processes - for obvious reasons: The kernel queues, sorts and > merges write requests anyway, so the number of processes doing the writes > does not matter. But I've noticed something peculiar: If I change my > benchmark to write 4K blocks at 4K boundaries, write performance increases > to almost 300%. This is quite logical, since the kernel can write a 'page What was your previous benchmark write size? And what parameters did you use when creating the RAID 0 array and filesystem? There may be opportunities for tuning there. Greg [snip]
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