From: Dominik Csapak Date: Wed, 25 May 2016 13:40:26 +0000 (+0200) Subject: add paragraph for IO Thread option X-Git-Url: https://git.proxmox.com/?p=pve-docs.git;a=commitdiff_plain;h=c564fc5275010dba92b74052cc7342bdbe0c2a0d add paragraph for IO Thread option Signed-off-by: Dominik Csapak --- diff --git a/qm.adoc b/qm.adoc index ab6d5bd..f6c968a 100644 --- a/qm.adoc +++ b/qm.adoc @@ -162,6 +162,12 @@ when the filesystem of a VM marks blocks as unused after removing files, the emulated SCSI controller will relay this information to the storage, which will then shrink the disk image accordingly. +The option *IO Thread* can only be enabled when using a disk with the *Virtio* controller, +or with the *SCSI* controller, when the emulated controller type is *VIRTIO*. +With this enabled, Qemu uses one thread per disk, instead of one thread for all, +so it should increase performance when using multiple disks. +Note that backups do not currently work with *IO Thread* enabled. + Managing Virtual Machines with 'qm' ------------------------------------