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scylla_raid_setup: increase chunk size

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The current chunk size of 256 gives a 50% probability of a 128k read or
write getting split into two accesses.  This reduces efficiency and
increases latency.

Change the chunk size to 1MB, with a 12% probability of cross-member
access.

Message-Id: <1476269082-2473-1-git-send-email-avi@scylladb.com>
This commit is contained in:
Avi Kivity
2016-10-12 13:44:41 +03:00
parent 80e3d8286c
commit a837da06ef
1 changed files with 1 additions and 1 deletions
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2
dist/common/scripts/scylla_raid_setup vendored
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@@ -60,7 +60,7 @@ if [ "$NAME" = "Ubuntu" ]; then
else
yum -y install mdadm xfsprogs
fi
mdadm --create --verbose --force --run $RAID --level=0 -c256 --raid-devices=$NR_DISK $DISKS
mdadm --create --verbose --force --run $RAID --level=0 -c1024 --raid-devices=$NR_DISK $DISKS
blockdev --setra 65536 $RAID
mkfs.xfs $RAID -f
echo "DEVICE $DISKS" > /etc/mdadm.conf