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From: | Avi Kivity |
Subject: | Re: [Qemu-devel] [RFC] Disk integrity in QEMU |
Date: | Sun, 19 Oct 2008 21:31:56 +0200 |
User-agent: | Thunderbird 2.0.0.16 (X11/20080723) |
M. Warner Losh wrote:
In message: <address@hidden> Avi Kivity <address@hidden> writes:: >> Sounds like a bug. Shouldn't Linux disable the write cache unless the : >> user explicitly enables it, if NCQ is available? NCQ should provide : >> acceptable throughput even without the write cache. : >> : > : > How can it be a bug? : : If it puts my data at risk, it's a bug. I can understand it for IDE,: but not for SATA with NCQ. So wouldn't async mounts by default be a bug too?
No. Applications which are worried about data integrity use fsync() or backups to protect the user.
I'm not worried about losing a few minutes of openoffice.org work. I'm worried about mail systems, filesystem metadata, etc. which can easily lose a large amount of data which is hard to recover.
-- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.
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