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nodump
2011 Oct 09
1
Btrfs High IO-Wait
...s
avgrq-sz avgqu-sz await r_await w_await svctm %util
sda 0.00 0.00 0.00 10.00 0.00 128.00
25.60 0.03 3.40 0.00 3.40 3.40 3.40
sdb 0.00 27.80 0.00 48.20 0.00 318.40
13.21 0.43 8.84 0.00 8.84 1.99 9.60
iodump shows similar results, where sdb is the data disk, sda7 the
journal and sda5 the root.
btrfs
root@s-brick-003:~# echo 1 > /proc/sys/vm/block_dump
root@s-brick-003:~# while true; do sleep 1; dmesg -c; done | perl
/usr/local/bin/iodump
^C# Caught SIGINT.
TASK PID TOTAL...