Hi,
On Windows
2000....
have 4 36GB 15,000
RPM SCSI hard drives for the main storage. Two channel disk controller,
put two drives on each channel. 64-bit PCI LSI/Mylex 352 controller.
For first
round - I configured these 4 drives as RAID 0+1 yielding 72GB of
usable space. Also formatted the partition with NTFS using a 8K block
size.
Log is on a
dedicated 7200 RPM IDE drive with no other purpose (also on a dedicated IDE
controller channel).
Observations:
Watching kernel.exe
with performance monitor, I/O performance on the main data array seems to be
about twice (2x) what a single 7200 RPM IDE drive on dedicated channel was doing
before. Given the 2x spin rate and 2x drives (raid 0), I expected a
little more improvement (3x to 4s instead of only 2x).
Any thoughts or
suggestions? Is NTFS @ 8K block size ideal for SAPDB, or am I overlooking
something?
Obviously I could
put the 4 drives all in a RAID 0 and get more performance... which is an option
as we have custom replication between our two SAPDB servers.... but I am
undecided if this gain is worth the potential downtime/recovery
time.
Thank you for any
input.
Stephen
Gutknecht
currently in
Long Beach, California USA
