block device type supporting trim or scsi unmap ?

block device type supporting trim or scsi unmap ?

[Alexandre DERUMIER]

Hi,
I'm looking to implement a san storage with ssd drive.

which block device type support trim or scsi unmap ?

I think ide support it (but performance...)

scsi ?
virtio ?
virtio-scsi ?


Regards,

Alexandre Derumier

Re: block device type supporting trim or scsi unmap ?

[ronnie sahlberg]

On Thu, May 10, 2012 at 8:19 PM, Alexandre DERUMIER <aderumier@odiso.com> wrote:
> Hi,
> I'm looking to implement a san storage with ssd drive.
>
> which block device type support trim or scsi unmap ?
>
> I think ide support it (but performance...)
>
> scsi ?
> virtio ?
> virtio-scsi ?

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.


>
>
> Regards,
>
> Alexandre Derumier
>
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> the body of a message to majordomo@vger.kernel.org
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Re: block device type supporting trim or scsi unmap ?

[Alexandre DERUMIER]

>>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 ?



----- Mail original ----- 

De: "ronnie sahlberg" <ronniesahlberg@gmail.com> 
À: "Alexandre DERUMIER" <aderumier@odiso.com> 
Cc: kvm@vger.kernel.org 
Envoyé: Jeudi 10 Mai 2012 12:27:05 
Objet: Re: block device type supporting trim or scsi unmap ? 

On Thu, May 10, 2012 at 8:19 PM, Alexandre DERUMIER <aderumier@odiso.com> wrote: 
> Hi, 
> I'm looking to implement a san storage with ssd drive. 
> 
> which block device type support trim or scsi unmap ? 
> 
> I think ide support it (but performance...) 
> 
> scsi ? 
> virtio ? 
> virtio-scsi ? 

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. 


> 
> 
> Regards, 
> 
> Alexandre Derumier 
> 
> -- 
> To unsubscribe from this list: send the line "unsubscribe kvm" in 
> the body of a message to majordomo@vger.kernel.org 
> More majordomo info at http://vger.kernel.org/majordomo-info.html 



-- 

-- 




	Alexandre D erumier 
Ingénieur Système 
Fixe : 03 20 68 88 90 
Fax : 03 20 68 90 81 
45 Bvd du Général Leclerc 59100 Roubaix - France 
12 rue Marivaux 75002 Paris - France 
	

Re: block device type supporting trim or scsi unmap ?

[ronnie sahlberg]

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

Re: block device type supporting trim or scsi unmap ?

[Alexandre DERUMIER]

>>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 



-- 

-- 




	Alexandre D erumier 
Ingénieur Système 
Fixe : 03 20 68 88 90 
Fax : 03 20 68 90 81 
45 Bvd du Général Leclerc 59100 Roubaix - France 
12 rue Marivaux 75002 Paris - France