* Re: [gentoo-user] OT: btrfs raid 5/6
@ 2017-12-12 13:24 99% ` Neil Bothwick
0 siblings, 0 replies; 1+ results
From: Neil Bothwick @ 2017-12-12 13:24 UTC (permalink / raw
To: gentoo-user
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On Tue, 12 Dec 2017 12:18:23 +0000, Wols Lists wrote:
> > That means every write has to be encrypted 4 times, whereas using
> > encryption in the filesystem means it only has to be done once. I
> > tried setting encrypted BTRFS this way and there was a significant
> > performance hit. I'm seriously considering going back to ZoL now that
> > encryption is on the way.
>
> DISCLAIMER - I DON'T HAVE A CLUE HOW THIS ACTUALLY WORKS IN DETAIL
>
> but there's been a fair few posts on LKML sublists about how linux is
> very inefficient at using hardware encryption. Setup/teardown is
> expensive, and it only encrypts in small disk-size blocks, so somebody's
> been trying to make it encrypt in file-system-sized chunks. When/if they
> get this working, you'll probably notice a speedup of the order of 90%
> or so ...
This isn't so much a matter of hardware vs. software encryption, more
that encrypting below the RAID level means everything has to be encrypted
multiple times.
--
Neil Bothwick
There's no place like ~
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2017-11-27 22:30 [gentoo-user] OT: btrfs raid 5/6 Bill Kenworthy
2017-12-01 16:58 ` Wols Lists
2017-12-01 17:14 ` Rich Freeman
2017-12-06 23:28 ` Frank Steinmetzger
2017-12-06 23:35 ` Rich Freeman
2017-12-07 0:13 ` Frank Steinmetzger
2017-12-07 0:29 ` Rich Freeman
2017-12-07 21:37 ` Frank Steinmetzger
2017-12-07 21:49 ` Wols Lists
2017-12-11 23:20 ` Frank Steinmetzger
2017-12-12 10:15 ` Neil Bothwick
2017-12-12 12:18 ` Wols Lists
2017-12-12 13:24 99% ` Neil Bothwick
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