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From: | Konstantin Krotov |
Subject: | Re: [Qemu-devel] virtio-blk and virtio-scsi performance comparison |
Date: | Tue, 21 Apr 2015 12:53:32 +0300 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Icedove/31.6.0 |
16.04.2015 14:57, Paolo Bonzini пишет:
On 16/04/2015 13:17, Konstantin Krotov wrote:In my production system i'm interested to use io=thread, becouse i export MD raid1 devices to guest's and i need to read from the MD device performs balanced between raid1 legs (it's true only if io=thread).Can you detail the problem more? That could be a kernel bug. Paolo
I connect to the host system, two storage systems as block devices. Both block devices combine md-raid1. md-device use as disk for virtual machine. If i use io=native, read perform only from one of two raid1 legs. I'd like to distribute the load reading between two raid1 legs, but md-raid1 implementation it does only if set io=thread.
-- WBR Konstantin V. Krotov
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