From: Dave Chinner <david@fromorbit.com>
To: Wang Yugui <wangyugui@e16-tech.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: questions about hybird xfs wih ssd/hdd by realtime subvol
Date: Tue, 30 Aug 2022 08:10:47 +1000 [thread overview]
Message-ID: <20220829221047.GU3600936@dread.disaster.area> (raw)
In-Reply-To: <20220829102619.AE3B.409509F4@e16-tech.com>
On Mon, Aug 29, 2022 at 10:26:20AM +0800, Wang Yugui wrote:
> Hi,
>
> I saw some info about hybird xfs wih ssd/hdd by realtime subvol.
>
> Hybrid XFS—Using SSDs to Supercharge HDDs at Facebook
> https://www.usenix.org/conference/srecon19asia/presentation/shamasunder
....
> Is there any tool/kernel option/kernel patch to control the data to save
> into normal vol or realtime subvol firstly?
FB were running a modified kernel that selected the rt dev based on
the initial allocation size. Behaviour for them was predictable
because they also controlled the application that was storing the
data. See:
https://lore.kernel.org/linux-xfs/20171128215527.2510350-1-rwareing@fb.com/
-Dave.
--
Dave Chinner
david@fromorbit.com
prev parent reply other threads:[~2022-08-29 22:10 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cra8LsdEma_cTwegy_oY4sLK9oYZOVv-VzyNw2y5Azvj_cPt5Fx3AyINvXKkQFhNXwB6-xMP4wVI67KS0eru1w==@protonmail.internalid>
2022-08-29 2:26 ` questions about hybird xfs wih ssd/hdd by realtime subvol Wang Yugui
2022-08-29 8:24 ` Carlos Maiolino
2022-08-30 0:57 ` Wang Yugui
2022-08-30 2:28 ` Darrick J. Wong
2022-08-31 0:50 ` Wang Yugui
2022-08-31 1:20 ` Darrick J. Wong
2022-08-29 22:10 ` Dave Chinner [this message]
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