On Aug 29, 2013, at 9:24 PM, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > On Aug 29, 2013, at 9:19 PM, Eric Sandeen <sandeen@xxxxxxxxxxx> wrote: >> >> Argh sorry, how did I type THAT? >> >> # blockdev --getiomin --getioopt /dev/mapper/vg1-data > > conventional LV: > [root@f19s ~]# blockdev --getiomin --getioopt /dev/mapper/vg1-data > 512 > 0 > > thinp LV: > > [root@f19s ~]# blockdev --getiomin --getioopt /dev/mapper/vg1-data > 512 > 262144 It's tied to the chunk size of the thinp. If I create a 4MB chunk size, ioopt goes up to match it. The default is 256KB, which reflects the values above. [root@f19s ~]# lvcreate -L 400G --type thin-pool -c 4M --thinpool thinp vg1 device-mapper: remove ioctl on failed: Device or resource busy Logical volume "thinp" created [root@f19s ~]# lvcreate -V 100G -T vg1/thinp --name data Logical volume "data" created [root@f19s ~]# blockdev --getiomin --getioopt /dev/mapper/vg1-data 512 4194304 Chris Murphy _______________________________________________ xfs mailing list xfs@xxxxxxxxxxx http://oss.sgi.com/mailman/listinfo/xfs
