I'm in the process of installing a DS20 (2CPU 2GB) server that will
be running DEC Unix 4.0E. This system has 7 x 9.1GB storageworks
drives in total with 4 drives on channel 1 and 3 drives on channel 2
of a KZPAC controller.
I'm trying to decide which is the best RAID configuration for optimal
system performance. Initially I was planning to create a RAID-1 set
(utilizing 2 drives) for my system disk thinking that a dedicated
mirror set would provide quickest access for high priority system
tasks such as swapping and paging etc. I was then going to put the
remaining 5 drives in a RAID-5 set to be used for user data and apps.
Having second thoughts on this approach, I'm now wondering if I
could achieve better overall performance if I configure all my disks
into a single RAID-5 array and then create partitions for "/",
"/usr", swap, "/tmp", "/usr1/data", and "/usr1/apps" within this
logical drive. This way I gain the performance benefits of RAID-5
striping across all 7 disks but will still incur some overhead in
maintaining the parity stripes. Would this second scenario be a
approach for overall performance??
This system is being used a time-sharing host for about 100 users to
run our business appilcation software which involves both online
transactions and batch processing on a fairly small database.
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Received on Wed Oct 20 1999 - 19:36:04 NZDT