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Date: Tue, 11 Aug 2015 12:38:39 +0300 (MSK)
From: Dmitry Morozovsky <marck@rinet.ru>
To: Alexander Motin <mav@freebsd.org>
cc: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: Re: svn commit: r286570 - in
 head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs: . sys
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Alexander,

On Mon, 10 Aug 2015, Alexander Motin wrote:

> Author: mav
> Date: Mon Aug 10 10:34:23 2015
> New Revision: 286570
> URL: https://svnweb.freebsd.org/changeset/base/286570
> 
> Log:
>   MFV r277426: 5408 managing ZFS cache devices requires lots of RAM
>   
>   illumos/illumos-gate@89c86e32293a30cdd7af530c38b2073fee01411c

[snip]

>   For an average blocksize of 8KB, this means that for the L2ARC, the ratio
>   of metadata to data has gone down from about 2.92% to 1.56%.  For a
>   'storage optimized' EC2 instance with 1600GB of SSD and 60GB of RAM, this
>   means that we expect a completely full L2ARC to use (1600 GB * 0.0156) /
>   60GB = 41% of the available memory, down from 78%.

Thanks!

Any MFC planned please?


-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck@FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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