linux-kernel - Re: [ANNOUNCE] Reiser5: Data Tiering. Burst Buffers. Speedup synchronous modifications

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Message-ID: <20200530101354.GA630@duo.ucw.cz>
Date:   Sat, 30 May 2020 12:13:54 +0200
From:   Pavel Machek <pavel@....cz>
To:     Edward Shishkin <edward.shishkin@...il.com>
Cc:     ReiserFS development mailing list 
        <reiserfs-devel@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [ANNOUNCE] Reiser5: Data Tiering. Burst Buffers. Speedup
 synchronous modifications

Hi!


> For example, you can use proxy device to store hot data only. With
> such strategy new logical blocks (which are always "cold") will always
> go to the main storage (in contrast with Burst Buffers, where new
> logical blocks first get written to the proxy disk). Once in a while
> you need to scan your volume in order to push colder data out, and
> pull hotter data in the proxy disk. Reiser5 contains a common
> interface for this. It is possible to maintain per-file, or even per-
> blocks-extent "temperature" of data (e.g. as a generation counter),

Would it be possible to offer userland interface for this? I can
probably say that mp3/video files should be cold, while some source
files should be hot, etc...

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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