We are setting up a M80 with 6GB RAM and 65+ GB hard drive, the
issue here is initially we need to load history information on the I2
propietary DB (indexed files)which might grow upto 2.1 GB.
A F80 with less memory is kicking a M80's butt, still runs just about
under 7 hours, so loading and reloading is not the issue neither are
indexed files size (about 1.5 to 2.1 GB),after 5 hours of guessing I
finally asked about disk layout and on the M80 they have a raid 5
array (SSA) and raid0 on the F80, so it is a good reason, since
processor speed is not that superior on the M80, however the customer
gives a sh... about it and wants it to run it as fast as the F80, I
suggested replacing the raid5 for raid0 config and setup a performance
baseline, they are reluctant about it, since it will be running with
raid5 in production, also suggested using raid10 or mirroring but
anyway I would like to explore the posibility to improve raid5 perf.
I found a couple of hits suggesting to increase the number of
queue_depth and max_coalesce, I changed those two values but it had a
negative impact on the performance
any ideas appreciated.
the raid5 is built out of 7 18GB SSA disks using the 6230 SSA
adapter, fast-write cache is enabled but I belive write op's are
washing that out.
ps. an apology for spelling errors.