Re: Tuning ext3 for large disk arrays

[Peter Chubb <peterc@gelato.unsw.edu.au>]

>>>>> "Badari" == Badari Pulavarty <pbadari@us.ibm.com> writes:

Badari> What kernel are you running ?  Does the kernel has ext3
Badari> "reservation" support enabled ? 
2.6.11, and yes, although it's not set in the mount options.


Badari> Do you see performance problem
Badari> with "read" tests also ? 

Yes.

Badari> And also, does the write test writes
Badari> to multiple files in the same directory ? Or multiple threads
Badari> writing to same file ?

It's standard iozone --- mutliple processes writing to multiple files in
the same directory.

All the mount options are the defaults.

A sample test is:

mdadm -Ss
mdadm -C /dev/md0 -l 0 -c 1024 -n 2 -R  /dev/sdc /dev/sdk 
mke2fs -j  /dev/md0 
mount /dev/md0 /shift/oplapro97/data01
cd /shift/oplapro97/data01
iozone -MCew -t1 -f IOZONE -s32g -r256k -i0 -i1 > ~/tests/unsw_ext3/iozone_2_disk_1stream_ext3
rm -rf /shift/oplapro97/data01/*
iozone -MCew -t2 -f IOZONE -s32g -r256k -i0 -i1 > ~/tests/unsw_ext3/iozone_2_disk_2stream_ext3


-- 
Dr Peter Chubb  http://www.gelato.unsw.edu.au  peterc AT gelato.unsw.edu.au
The technical we do immediately,  the political takes *forever*
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