From: Kumar amit mehta <gmate.amit@gmail.com>
To: Zdenek Kabelac <zkabelac@redhat.com>
Cc: linux-lvm@redhat.com
Subject: Re: [linux-lvm] lvcreate --thin gives "unknown segment type" error
Date: Mon, 22 Jul 2013 06:57:42 -0400 [thread overview]
Message-ID: <20130722105712.GA1570@gmail.com> (raw)
In-Reply-To: <51ED2268.7030702@redhat.com>
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.
!!amit
next prev parent reply other threads:[~2013-07-22 10:57 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-22 5:15 [linux-lvm] lvcreate --thin gives "unknown segment type" error Kumar amit mehta
2013-07-22 12:15 ` Zdenek Kabelac
2013-07-22 10:57 ` Kumar amit mehta [this message]
2013-07-22 11:23 ` Kumar amit mehta
2013-07-22 20:18 ` Zdenek Kabelac
2013-07-23 0:52 ` Kumar amit mehta
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