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From: | Paolo Bonzini |
Subject: | Re: [Qemu-devel] Block job commands in QEMU 1.2 [v2, including support for replication] |
Date: | Thu, 31 May 2012 13:17:56 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120430 Thunderbird/12.0.1 |
Il 31/05/2012 13:08, Geert Jansen ha scritto: > 1) Target flushes are not guaranteed to happen at all. If the latency of > the target is higher than the maximum interval between writes to the > source, the bitmap will always be dirty when a write to the target > returns, and a target flush will never be issued. That's a very good point. > 2) The fact that drive-mirror waits for acknowledgments of writes to the > target means that there is at most one I/O outstanding and throughput is > bound by latency. That can be fixed, I'll add it on my ever-growing todo list. :) Paolo
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