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* Re: [gentoo-user] OT: btrfs raid 5/6
  @ 2017-12-12 12:18 99%                     ` Wols Lists
  0 siblings, 0 replies; 1+ results
From: Wols Lists @ 2017-12-12 12:18 UTC (permalink / raw
  To: gentoo-user

On 12/12/17 10:15, Neil Bothwick 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 ...

Cheers,
Wol


^ permalink raw reply	[relevance 99%]

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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 99%                     ` Wols Lists

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