From: Alexandre DERUMIER <aderumier@odiso.com>
To: ronnie sahlberg <ronniesahlberg@gmail.com>
Cc: kvm@vger.kernel.org
Subject: Re: block device type supporting trim or scsi unmap ?
Date: Thu, 10 May 2012 22:42:02 +0200 (CEST) [thread overview]
Message-ID: <d28ee1be-3c13-4bca-885d-5ff6699b5940@mailpro> (raw)
In-Reply-To: <CAN05THQD7hvqqe1uXaR3387H_MqHpOhg-miGNyhDJnQQ0zrgFw@mail.gmail.com>
>>Guess it depends on how recent kernel your guest runs.
>>If you present it as a SCSI disk to the guest, then I have
>>successfully had Linux Mint 12 guests do UNMAP when accessing /dev/sd*
>>from within the guest.
Ok, thanks for the info, i'll try it !
----- Mail original -----
De: "ronnie sahlberg" <ronniesahlberg@gmail.com>
À: "Alexandre DERUMIER" <aderumier@odiso.com>
Cc: kvm@vger.kernel.org
Envoyé: Jeudi 10 Mai 2012 14:36:38
Objet: Re: block device type supporting trim or scsi unmap ?
On Thu, May 10, 2012 at 10:28 PM, Alexandre DERUMIER
<aderumier@odiso.com> wrote:
>>>iscsi supports it too but it requires that your iscsi target supports
>>>these opcodes, and that the filesystem/storage behind it supports it
>>>too.
>>>TGTD with EXT4 and a suitable storage device should do the trick.
>
> I'm using a iscsi solaris target, with scsi UNMAP support.
> Drives also support scsi unmap in raid (ocz talos hdd).
> I'm using direct lun access from host to guest.
>
>
> But my question was, which block device inside guests have trim or scsi unmap implemention ?
>
>
Guess it depends on how recent kernel your guest runs.
If you present it as a SCSI disk to the guest, then I have
successfully had Linux Mint 12 guests do UNMAP when accessing /dev/sd*
from within the guest.
If you present the device as a SCSI disk to the guest, you use a
recent 3.x linux kernel for the guest and EXT4 as the filesystem
I guess it should work.
Dont know about status for IDE emulation.
regards
ronnie sahlberg
--
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Alexandre D erumier
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prev parent reply other threads:[~2012-05-10 20:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <4d1098b7-0c3e-4253-9381-be021467b76e@mailpro>
2012-05-10 10:19 ` block device type supporting trim or scsi unmap ? Alexandre DERUMIER
2012-05-10 10:27 ` ronnie sahlberg
2012-05-10 12:28 ` Alexandre DERUMIER
2012-05-10 12:36 ` ronnie sahlberg
2012-05-10 20:42 ` Alexandre DERUMIER [this message]
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