linux-kernel - RAID + LUKS + LVM performance

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Message-ID: <OF8365E100.57191C87-ON802576E3.0046BDEA-802576E3.0047EFDF@ie.ibm.com>
Date:	Thu, 11 Mar 2010 13:08:56 +0000
From:	Mathias Buren <mathias.buren@...ibm.com>
To:	linux-kernel@...r.kernel.org
Subject: RAID + LUKS + LVM performance

Hi,

(please cc me as I'm not subscribed)

I've a friend who's going to set up a fileserver consisting of 8x 1.5TB
HDDs, an 8-port PCI-E RAID card (Areca ARC-1220 @
http://www.areca.com.tw/products/pcie.htm ) etc.
The plan is create a RAID5 array spanning all the disks, then create 4
partitions. These 4 partitions would be encrypted using LUKS (Twofish or
AES256).
These 4 encrypted partition would be set up in RAID0 using Linux' software
(mdadm), then LVM would be used on top of that (one big PV, one big VG and
a big LV or so).

The reason for this is that kcryptd is not multithreaded (afaik). By having
4 encrypted partitions, then md0 on top of them, I'm forcing 4 kcryptd
processes to run on all four cpu cores whenever something is written to the
disks, which should improve (encryption) performance.

Is this a good way of doing it, or is there a smarter way?

Regards,

Mathias,

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