* Re: [gentoo-user] OT: btrfs raid 5/6
@ 2017-12-12 10:15 99% ` Neil Bothwick
0 siblings, 0 replies; 1+ results
From: Neil Bothwick @ 2017-12-12 10:15 UTC (permalink / raw
To: gentoo-user
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On Tue, 12 Dec 2017 00:20:48 +0100, Frank Steinmetzger wrote:
> My new drives are finally here. One of them turned out to be an OEM. -_-
> The shop says it will cover any warranty claims and it’s not a backyard
> seller either, so methinks I’ll keep it.
>
> To evaluate LUKS, I created the following setup (I just love
> ASCII-painting in vim ^^):
>
> ┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
> ┃ tmpfs ┃
> ┃ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┃
> ┃ │ 1 GB file │ │ 1 GB file │ │ 1 GB file │ │ 1 GB file │ ┃
> ┃ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ ┃
> ┃ V V V V ┃
> ┃ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┌─────────────┐ ┃
> ┃ │ LUKS device │ │ LUKS device │ │ LUKS device │ │ LUKS device │ ┃
> ┃ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ └──────┬──────┘ ┃
> ┃ V V V V ┃
> ┃ ┌─────────────────────────────────────────────────────────────┐ ┃
> ┃ │ RaidZ2 │ ┃
> ┃ └─────────────────────────────────────────────────────────────┘ ┃
> ┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
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.
--
Neil Bothwick
A printer consists of three main parts: the case, the jammed paper tray
and the blinking red light.
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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 99% ` Neil Bothwick
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