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From: Eric Sandeen <sandeen@sandeen.net>
To: Richard Bade <hitrich@gmail.com>, xfs@oss.sgi.com
Subject: Re: XFS and nobarriers on Intel SSD
Date: Thu, 3 Sep 2015 08:43:16 -0500	[thread overview]
Message-ID: <55E84E74.9050404@sandeen.net> (raw)
In-Reply-To: <55E84C40.8020602@sandeen.net>

On 9/3/15 8:33 AM, Eric Sandeen wrote:
> On 9/2/15 9:24 PM, Richard Bade wrote:

...

>> The reason I am asking about this is that we are seeing some
>> significant I/O delays on the disks causing a “SCSI Task Abort” from
>> the OS. This seems to be triggered by the drive receiving a
>> “Synchronize cache command”. My current thinking is that setting no
>> barriers will stop the drive receiving a sync command and therefore
>> stop the I/O delay associated with it.
> 
> Interesting, I thought that usually devices with battery-backed cache
> will just ignore synchronize cache commands.

Or more precisely, the device should advertise itself in such a way that
the commands wouldn't be sent, even if nobarrier wasn't specified...

-Eric

> But if not, then sure, maybe that's the issue.
> 
> -Eric

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      reply	other threads:[~2015-09-03 13:43 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-03  2:24 XFS and nobarriers on Intel SSD Richard Bade
2015-09-03 13:33 ` Eric Sandeen
2015-09-03 13:43   ` Eric Sandeen [this message]

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