On Mon, Jul 22, 2013 at 06:57:42AM -0400, Kumar amit mehta wrote:
> On Mon, Jul 22, 2013 at 02:15:36PM +0200, Zdenek Kabelac wrote:
> > configure --with-thin=internal
> >
> > (and you will likely miss '--enable-udev_sync'
> Thank you, it worked!
>
> However, It seems that "discards" behavior for thin pool is not
> supported on RHEL 6.4. Please confirm.
> # ./configure --with-thin=internal --enable-debug
>
> # make; make install
>
> # lvcreate --discards passdown -L 1G -T thinvg1/thinlv1
> Logical volume "thinlv1" created
>
> # lvs -o +devices|grep -i thinlv1
> thinlv1 thinvg1 twi-a-tz- 1.00g 0.00
> thinlv1_tdata(0)
>
> # dmesg
> device-mapper: thin: Data device (dm-3) discard unsupported: Disabling
> discard passdown.
>
> <snip>
> if (reason) {
> DMWARN("Data device (%s) %s: Disabling discard
> passdown.", bdevname(data_bdev, buf), reason);
> pt->adjusted_pf.discard_passdown = false;
> }
> <snip>
>
> Seems that we'll reach here if QUEUE_FLAG_DISCARD flag in the request
> queue is not set.
More information of my setup:
<snip from /etc/lvm/lvm.conf>
issue_discards = 1
<snip from /etc/lvm/lvm.conf>
I'm invoking these commands on a VM. I do not know, from where these
storage were mapped to my VM(were done my some storage admin). However
when i invoke sg_inq (from sg3_utils) to get some information, that fails
too :(
<snip>
# sg_inq /dev/vde
Both SCSI INQUIRY and fetching ATA information failed on /dev/vde
<snip>
!!amit
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