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From: | Rik van Riel |
Subject: | Re: [Qemu-devel] [RFC] Disk integrity in QEMU |
Date: | Mon, 13 Oct 2008 13:58:54 -0400 |
User-agent: | Thunderbird 2.0.0.17 (X11/20080915) |
Anthony Liguori wrote:
When cache=on, read requests may not actually go to the disk. If a previous read request (by some application on the system) has read the same data, then it becomes a simple memcpy(). Also, the host IO scheduler may do read ahead which means that the data may be available from that.
This can be as much of a data integrity problem as asynchronous writes, if various qemu/kvm guests are accessing the same disk image with a cluster filesystem like GFS. -- All rights reversed.
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