On Aug 29, 2013, at 8:58 PM, Dave Chinner <david@xxxxxxxxxxxxx> wrote:
>
> Check the contents of
> /sys/block/<dev>/queue/{minimum,optimal}_io_size for the single
> device, the standard LV and the thinp device.
physical device:
[root@f19s ~]# cat /sys/block/sda/queue/minimum_io_size
512
[root@f19s ~]# cat /sys/block/sda/queue/optimal_io_size
0
conventional LV on that physical device:
[root@f19s ~]# cat /sys/block/dm-0/queue/minimum_io_size
512
[root@f19s ~]# cat /sys/block/dm-0/queue/optimal_io_size
0
thinp pool and LV:
lrwxrwxrwx. 1 root root 7 Aug 29 20:46 vg1-thinp -> ../dm-3
[root@f19s ~]# cat /sys/block/dm-3/queue/minimum_io_size
512
[root@f19s ~]# cat /sys/block/dm-3/queue/optimal_io_size
262144
[root@f19s ~]#
lrwxrwxrwx. 1 root root 7 Aug 29 20:47 vg1-data -> ../dm-4
[root@f19s ~]# cat /sys/block/dm-4/queue/minimum_io_size
512
[root@f19s ~]# cat /sys/block/dm-4/queue/optimal_io_size
262144
Chris Murphy
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