Comments on: EPRD & lessfs http://www.lessfs.com/wordpress/?p=753 Open source data de-duplication & data tiering for less Wed, 18 Mar 2015 13:40:57 +0000 hourly 1 http://wordpress.org/?v=4.0.7 By: HoverHell http://www.lessfs.com/wordpress/?p=753&cpage=1#comment-5084 Fri, 11 May 2012 11:06:16 +0000 http://www.lessfs.com/wordpress/?p=753#comment-5084 Uh, should’ve htmlescaped that.
Anyway, paste.ubuntu.com/981504/
(though I suppose the required change is clear anyway)

]]> By: HoverHell http://www.lessfs.com/wordpress/?p=753&cpage=1#comment-5083 Fri, 11 May 2012 11:04:27 +0000 http://www.lessfs.com/wordpress/?p=753#comment-5083 eprd kernel module does not compile (or, actually, fails to insmod) on 32-bit (i686) systems; a simple fix changes that:

diff -dr eprd-0.4.0.b1/eprd.c eprd-0.4.0/eprd.c
136c136
cachesize / BLKSIZE * .66;
—
> low_water = dev->cachesize / BLKSIZE * 2 / 3;

although I am not completely sure it still works completely as intended, but at least it works.

]]> By: Hanz http://www.lessfs.com/wordpress/?p=753&cpage=1#comment-4909 Tue, 08 May 2012 19:15:45 +0000 http://www.lessfs.com/wordpress/?p=753#comment-4909 Hello Maru,
first thanks for programming of lessfs.
I have question about EPRD. What are the benefits versus kernel disk cache? (assuming i have lot of ram)
Thanks in advance,
Hanz

]]> By: dimiz http://www.lessfs.com/wordpress/?p=753&cpage=1#comment-4839 Mon, 07 May 2012 07:08:49 +0000 http://www.lessfs.com/wordpress/?p=753#comment-4839 Hi Maru
I think is very great way have “data tiering” at the moment there are no project with auto tier ssd+disk+ram perhaps other like bcache is near the corner but they need newer kernel.
Thanks in advance

]]> By: maru http://www.lessfs.com/wordpress/?p=753&cpage=1#comment-4744 Sat, 05 May 2012 08:38:53 +0000 http://www.lessfs.com/wordpress/?p=753#comment-4744 Although to my best knowledge eprd-0.3.1 should be safe I would suggest not using EPRD for production until I release 1.0. ;-)
Extending the EPRD project to support automatic data tiering has been on my mind for some time.

And I have decided to at least investigate it.

]]> By: jippie http://www.lessfs.com/wordpress/?p=753&cpage=1#comment-4743 Sat, 05 May 2012 08:21:36 +0000 http://www.lessfs.com/wordpress/?p=753#comment-4743 Was checking EPRD this morning, looks really interesting! Just a couple of thoughts:
I was just thinking if eprd can also act as a cache to speed up an existing slow disk based filesystems, somhow haven’t got the guts to just try it with one of my live filesystems ;o)
Also interesting would be if the cache in RAM can be saved, so the cache doesn’t need a full rebuild after a reboot.

Hope this helps.

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