From: chickenmarkus@freenet.de
To: kvm@vger.kernel.org
Subject: Fwd: Discard is not working
Date: Fri, 07 Feb 2014 16:51:44 +0100 [thread overview]
Message-ID: <52F50110.1010909@freenet.de> (raw)
In-Reply-To: <52F2C104.4040503@freenet.de>
Hello,
I did not get response to my private mail address. So I'm subscribed now.
Bye Markus
-------- Original-Nachricht --------
Betreff: Discard is not working
Datum: Wed, 05 Feb 2014 23:53:56 +0100
Von: chickenmarkus@freenet.de
An: kvm@vger.kernel.org
Hello,
after reading the "invitation" for some one-off questions without subscribing excuse my disturbing, please.
At first my setup of host:
* in general Debian Wheezy
* Kernel: 3.11-0.bpo.2-amd64 (http://packages.debian.org/wheezy-backports/linux-image-3.11-0.bpo.2-amd64)
* LVM 2.02.98 (http://packages.debian.org/jessie/lvm2)
* thin-provisioning-tools 0.2.8-1 (http://packages.debian.org/jessie/thin-provisioning-tools)
* Qemu-KVM: 1.7.0 (http://packages.debian.org/jessie/qemu-kvm)
The new kernel and dirty things from Jessie are for working thin volumes with discard on my ssd. Everything's fine up to this point.
Afterwards I start a guest (also Debian Wheezy) over the following command (over libvirt) as root (for test only):
kvm [...] -drive file=/dev/ssd0/sarabi,if=none,id=drive-scsi0-0-0-0,format=raw,discard=unmap -device scsi-hd,bus=scsi0.0,channel=0,scsi-id=0,lun=0,drive=drive-scsi0-0-0-0,id=scsi0-0-0-0,bootindex=2 [...]
Neither lsblk -D nor the try of fstrim ends positive. Both say that discard is not supported.
I read that guests need at least kernel 3.4 to support discard (and virtio-scsi). But the same backports kernel 3.11 did not changed anything.
Did I understand something wrong? Is the command wrong? Are any requirements not met?
Bye Markus
next prev parent reply other threads:[~2014-02-07 15:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-05 22:53 Discard is not working chickenmarkus
2014-02-07 15:51 ` chickenmarkus [this message]
[not found] ` <52F422C2.9020509@redhat.com>
2014-02-07 16:36 ` Fwd: " Michael Tokarev
2014-02-07 20:19 ` chickenmarkus
2014-02-07 21:07 ` Paolo Bonzini
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