Hello Fellow XFS'ers,
I need you help. I have read and have experienced how
writes are slow to a software RAID5 array. I found
in the FAQ that to regain lost performance, I could
either setup a RAID1 array across a RAID5 array OR
set up a logging filesystem on a (preferably) existing
RAID1 array. I prefer the latter but I am running
into
problems with the best way to build this.
I am running two arrays of 11 100GB SCSI drives in
RAID5 on a Gigabyte motherboard (8idxh) w/a 1.8GHz P4
and 1.5GB of memory. I have a RAID1 consisting of two
Maxtor 60Gb EIDE 100 drives with space available for
extra filesystems. The O/S is Redhat 7.2. It has
been
loaded with the SGI Installer version 1.02.
I need to know
1) What kind of partition to create on the RAID1
drives.
2) What size should I make the logginf FS
considering
the size of the data area?
3) How do I determine the block size necessary for
the data XFS portion if a external log may
be involved?
4) Is it ok to use a single RAID1 array to be the
target of two XFS external logs?
5) Since the size of each array is 1 TB. Is there
any other performance criteria I should take
notice of?
Thank you very much. I really appreciate any input.
Darius Stout
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