lkml.org 
[lkml]   [2005]   [Jan]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] scsi/sata write barrier support
On Thu, Jan 27 2005, Jeff Garzik wrote:
> Doug Maxey wrote:
> >On Thu, 27 Jan 2005 13:02:48 +0100, Jens Axboe wrote:
> >
> >>Hi,
> >>
> >>For the longest time, only the old PATA drivers supported barrier writes
> >>with journalled file systems. This patch adds support for the same type
> >>of cache flushing barriers that PATA uses for SCSI, to be utilized with
> >>libata.
> >
> >
> >What, if any mechanism supports changing the underlying write cache?
> >
> >That is, assuming this is common across PATA and SCSI drives, and it is
> >possible to turn the cache off on the IDE drives, would switching the
> >cache underneath require completing the inflight IO?
>
> [ignoring your question, but it made me think...]
>
>
> I am thinking the barrier support should know if the write cache is
> disabled (some datacenters do this), and avoid flushing if so?

Ehm it does, read the code :)

--
Jens Axboe

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:09    [from the cache]
©2003-2011 Jasper Spaans