>>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@xxxxxxxxx> À: "Alexandre DERUMIER" <aderumier@xxxxxxxxx> Cc: kvm@xxxxxxxxxxxxxxx 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@xxxxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
