On 04/12/2017 07:22 PM, Eric Sandeen wrote:
On 4/12/17 11:20 AM, Christoph Hellwig wrote:
On Wed, Apr 12, 2017 at 07:15:40PM +0300, Avi Kivity wrote:
This preserves the ability to do O_DIRECT reads at 512 byte granularity,
yes?
No.
We make use of that (it's probably less important on NVMe; still why
waste bandwidth needlessly).
In that case it would be the wrong thing for you.
And it would be really interesting to see if the 512-byte DIOs you
issue under ext4 might trigger the same problem in the firmware.
We only issue 512-byte reads, writes are always 4096-byte aligned (and
usually 128k).
The disk that crashed was my /home; it did see some database loads, but
not much.
(This is all pure speculation, but that's all we've got) ;)
-Eric
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