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add paragraph for IO Thread option

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Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
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Dominik Csapak 2016-05-25 15:40:26 +02:00 committed by Dietmar Maurer
parent 2ec49380d4
commit c564fc5275
1 changed files with 6 additions and 0 deletions
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qm.adoc
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@ -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'
------------------------------------