From: Gary Chambers (gwc@ll.mit.edu)
Date: Fri Jan 16 2004 - 11:25:25 EST
All...
I've read Glenn Fawcett's _Solaris Volume Manager Performance Best
Practices_ to better plan and implement our cluster storage. Most of it
is pretty straight-forward, but I still have a couple of
performance-related questions.
To begin, we're using two eight-bay SCSI-IDE (Arena RackForce II) RAID
boxes (setup as RAID5 devices with a hot-spare since this is a
read-MOSTLY environment). Total usable disk space on each box is 447GB.
In SVM, I created within the metaset a device for each box as a
submirror, and attached them to d100. I now plan to begin creating file
systems as soft partitions. My questions are about fragmentation when
it becomes necessary to grow any of these filesystems.
I examined the output of 'metastat -s <diskset> -p' on a couple of test
filesystems, and noticed that the grown file system is appended to the
free space of the underlying device using an offset and blockcount,
which, in my mind is the only way it could be implemented.
1) How carefully should I plan my initial filesystem sizing?
2) Do you think fragmentation could cause a performance problem?
Just to be clear, I will be realistic in initially sizing these
partitions. My concern is that, over time, as we will almost inevitably
grow some of the file systems, fragmentation will noticeably degrade
performance. Am I being too pedantic about this? Thank you, and I will
certainly summarize.
Gary Chambers
// -------------------------------------
// MIT Lincoln Laboratory / 781-981-0957
// Lexington, Massachusetts
// Nothing fancy and nothing Microsoft
// -------------------------------------
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