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[Qemu-devel] [Bug 1338957] Re: RFE: add an event to report block devices
From: |
Thomas Huth |
Subject: |
[Qemu-devel] [Bug 1338957] Re: RFE: add an event to report block devices watermark |
Date: |
Sat, 28 Oct 2017 13:04:51 -0000 |
Upstream here:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=e2462113b2003085ad16f15e1
** Changed in: qemu
Status: New => Fix Released
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https://bugs.launchpad.net/bugs/1338957
Title:
RFE: add an event to report block devices watermark
Status in QEMU:
Fix Released
Bug description:
Add an event to report if a block device usage exceeds a threshold.
The threshold should be configurable with a monitor command. The event
should report the affected block device. Additional useful information
could be the offset of the highest sector , like in the query-
blockstats output.
Rationale for the RFE
Managing applications, like oVirt (http://www.ovirt.org), make extensive use
of thin-provisioned disk images.
In order to let the guest run flawlessly and be not unnecessarily paused,
oVirt sets a watermark and automatically resized the image once the watermark
is reached or exceeded.
In order to detect the mark crossing, the managing application has no choice
than aggressively polling the QEMU monitor
using the query-blockstats command. This lead to unnecessary system load, and
is made even worse under scale: scenarios
with hunderds of VM are becoming not unusual.
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