[dm-devel] ioband pebcak again, I'm sure.

[Clint Moore]

	Hopefully I'm doing something just as dumb this time as last time.

/dev/sdc and /dev/sdd are iscsi targets.

Cliff notes version is, after setting up ioband and adding a weight to  
two filesystems per the website docs, I can't mount them anywhere.  I  
tried this with a local device as well as iscsi targets.  Here's what  
I did to do this, perhaps I'm missing a step or something?


[root at gurn 302]# mount /dev/sdd1 /mnt
[root at gurn 302]# df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
...
/dev/sdd1              1031888    172316    807156  18% /mnt
[root at gurn 302]# umount /mnt
[root at gurn 302]# mount /dev/sdc1 /mnt
Filesystem           1K-blocks      Used Available Use% Mounted on
...
/dev/sdc1              1031888    172316    807156  18% /mnt
[root at gurn 302]# umount /mnt

So the filesystems mount ok otherwise...

[root at gurn 302]# blockdev --getsize /dev/sdc1
2096753
[root at gurn 302]# echo "0 2096753 ioband /dev/sdc1 1" | dmsetup create  
ioband2
[root at gurn 302]# blockdev --getsize /dev/sdd1
2096753
[root at gurn 302]# echo "0 2096753 ioband /dev/sdd1 1" | dmsetup create  
ioband1
[root at gurn 302]# dmsetup message ioband1 0 weight 40
[root at gurn 302]# dmsetup message ioband2 0 weight 10
[root at gurn 302]# dmsetup ls --target ioband
ioband2	(253, 1)
ioband1	(253, 0)
[root at gurn 302]#

[root at gurn 302]# mount /dev/sdc1 /mnt
mount: /dev/sdc1 already mounted or /mnt busy
[root at gurn 302]# mount /dev/sdd1 /mnt
mount: /dev/sdd1 already mounted or /mnt busy
[root at gurn 302]# umount /dev/sdd1
umount: /dev/sdd1: not mounted
[root at gurn 302]# mkdir /honk
[root at gurn 302]# mount /dev/sdd1 /honk
mount: /dev/sdd1 already mounted or /honk busy

Here's the fun part:

[root at gurn 302]# dmsetup remove ioband1
[root at gurn 302]# dmsetup remove ioband2
[root at gurn 302]# mount /dev/sdc1 /mnt
[root at gurn 302]# mount /dev/sdd1 /honk
[root at gurn 302]# df -k
Filesystem           1K-blocks      Used Available Use% Mounted on
...
/dev/sdc1              1031888    172560    806912  18% /mnt
/dev/sdd1              1031888    172316    807156  18% /honk
[root at gurn 302]#