On Tue, 2008-07-15 at 10:42 -0400, Justin Piszcz wrote:
> What were the commands used when creating the XFS filesystem
> (sunit,swidth)?
>
> Justin.
I noticed that on the hardware card I had to use nobarrier to get decent
file metadata performance (create,del etc). I have noticed also recently
on an 32gb Mtron SSD that with barriers enabled with XFS on the SSD
metadata performance was an order of magnitude slower.
The below is a snippit from the hardware RAID testing config. The XFS
creation and mounting args are identical for software RAID.
#!/bin/bash
RAIDLEVEL=6
CHUNK_SZ_KB=256
PARITY_DRIVE_COUNT=2
NON_PARITY_DRIVE_COUNT=4
DEVICE=/dev/disk/by-id/scsi-SAdaptec_1024ktmpraid6
...
run_bonnie() {
fsdev=$1
mountopts=$2
N=256
mount -o "$mountopts" $DEVICE /mnt/tmpraid
chown ben /mnt/tmpraid
sync
sleep 1
sudo -u ben /usr/sbin/bonnie++ -q -m $fsdev -n $N -d \
/mnt/tmpraid >>/T/adaptec-raid
${RAIDLEVEL}-${CHUNK_SZ_KB}kb-chunks-bonnie.csv
umount /mnt/tmpraid
}
...
fsdev=hardxfsdefaultnb
mkfs.xfs -f -l lazy-count=1 \
$DEVICE
run_bonnie $fsdev "nobarrier"
fsdev=hardxfsalign
mkfs.xfs -f -s size=4096 \
-d sunit=$(($CHUNK_SZ_KB*2)),swidth=$(($CHUNK_SZ_KB*2*
$NON_PARITY_DRIVE_COUNT)) \
-l lazy-count=1 \
$DEVICE
run_bonnie $fsdev "nobarrier"
fsdev=hardxfsdlalign
mkfs.xfs -f -s size=4096 \
-d sunit=$(($CHUNK_SZ_KB*2)),swidth=$(($CHUNK_SZ_KB*2*
$NON_PARITY_DRIVE_COUNT)) \
-l lazy-count=1,sunit=$((CHUNK_SZ_KB*2)),size=128m \
$DEVICE
run_bonnie $fsdev "nobarrier"
# run iozone on it.
fsdev=hardxfsalign
mkfs.xfs -f -s size=4096 \
-d sunit=$(($CHUNK_SZ_KB*2)),swidth=$(($CHUNK_SZ_KB*2*
$NON_PARITY_DRIVE_COUNT)) \
-l lazy-count=1 \
$DEVICE
mount -o "nobarrier" $DEVICE /mnt/tmpraid
chown ben /mnt/tmpraid
sync
sleep 1
sudo -u ben iozone -a -g 4G -f /mnt/tmpraid/iozone_file \
>/T/adaptec-raid${RAIDLEVEL}-${CHUNK_SZ_KB}kb-chunks-iozone.txt
umount /mnt/tmpraid
>
> On Wed, 16 Jul 2008, Ben Martin wrote:
>
> > Hi,
> > Apologies if posting this here is inappropriate but a recent article
> > of mine compares the Linux Kernel RAID code to an $800 hardware RAID
> > card and might be of interest to list members:
> >
> > http://www.linux.com/feature/140734
> >
> >
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