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Re: [Qemu-devel] [RFC] Disk integrity in QEMU
From: |
Avi Kivity |
Subject: |
Re: [Qemu-devel] [RFC] Disk integrity in QEMU |
Date: |
Fri, 10 Oct 2008 15:20:43 +0200 |
User-agent: |
Thunderbird 2.0.0.16 (X11/20080723) |
Paul Brook wrote:
>>> Absoutely agree that the default should be safe. I don't have enough
>>> knowledge to say whether O_DIRECT/O_DSYNC is best - which also implies
>>> we should choose the best setting by default, because we can't expect
>>> users to know the tradeoffs either.
>>>
>> The fact that there are different use models for qemu implies that the
>> default must be chosen at some higher level than qemu code itself. It
>> might be done using /etc/qemu or ~/.qemu, or at the management
>> interface, but there is no best setting for qemu itself.
>>
>
> This suggests that the most appropriate defaults are for the users that are
> least likely to be using a management tool. I'd guess that the server
> partitioning folks are most likely to be using a management tool, so qemu
> defaults should be setup for casual/development use. I don't have hard data
> to back this up though.
>
I agree (as my own uses are of the development kind). That rules out
O_DIRECT as the qemu-level default. However I'm not sure writeback is a
good default, it's too risky (though I've never been bitten; and I've
had my share of host crashes).
--
Do not meddle in the internals of kernels, for they are subtle and quick to
panic.
- Re: [Qemu-devel] [RFC] Disk integrity in QEMU, (continued)
- Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Anthony Liguori, 2008/10/10
- Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Paul Brook, 2008/10/10
- Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Avi Kivity, 2008/10/10
- Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Jens Axboe, 2008/10/17
- Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Avi Kivity, 2008/10/19
- Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Aurelien Jarno, 2008/10/10
Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Avi Kivity, 2008/10/10
Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Anthony Liguori, 2008/10/10
Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Mark Wagner, 2008/10/11
Re: [Qemu-devel] [RFC] Disk integrity in QEMU, Anthony Liguori, 2008/10/12
Re: [Qemu-devel] [RFC] Disk integrity in QEMU, nuitari-qemu, 2008/10/12