[stgt] Write-cache in tgtd during a target-host crash
fujita.tomonori at lab.ntt.co.jp
Fri Apr 23 03:26:22 CEST 2010
On Wed, 21 Apr 2010 19:51:49 +1000
ronnie sahlberg <ronniesahlberg at gmail.com> wrote:
> It would also be very useful to tell tgtd to use either or both of
> O_SYNC/O_DIRECT for all i/o depending on the semantics of the
> filesystem used to hos the lun files.
tgt opens a file with just O_LARGEFILE. If you enable the writeback
cache (on the target or initiator), tgt issues write and
sync_file_range system calls.
WCE bit can be changed at runtime, so I'm not sure using O_SYNC for
the writeback cache.
About O_DIRECT, what's the advantage of using O_DIRECT?
Note that you configure tgt to use AIO, tgts uses
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