From: Stan Hoeppner <stan@hardwarefreak.com>
To: Phil Turmel <philip@turmel.org>, Linux RAID <linux-raid@vger.kernel.org>
Subject: Re: "Missing" RAID devices
Date: Wed, 22 May 2013 17:43:33 -0500 [thread overview]
Message-ID: <519D4A15.7020107@hardwarefreak.com> (raw)
In-Reply-To: <519C0B13.3040906@turmel.org>
Sorry for the dup Phil, hit the wrong reply button.
On 5/21/2013 7:02 PM, Phil Turmel wrote:
...
> ...First is /dev/md1, a small (~500m) n-way
> ...as /boot. The other, /dev/md2, uses
> ...raid10,far3 or raid6.
>
> I put LVM on top of /dev/md2, with LVs for swap, ... /tmp
Swap and tmp atop an LV atop RAID6? The former will always RMW on page
writes, the latter quite often will cause RMW. As you stated your
performance requirements are modest. However, for the archives, putting
swap on a parity array, let alone a double parity array, is not good
practice.
--
Stan
next prev parent reply other threads:[~2013-05-22 22:43 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-21 12:51 "Missing" RAID devices Jim Santos
2013-05-21 15:31 ` Phil Turmel
2013-05-21 22:22 ` Jim Santos
2013-05-22 0:02 ` Phil Turmel
2013-05-22 0:16 ` Jim Santos
2013-05-22 22:43 ` Stan Hoeppner [this message]
2013-05-22 23:26 ` Phil Turmel
2013-05-23 5:59 ` Stan Hoeppner
2013-05-23 8:30 ` keld
2013-05-24 3:45 ` Stan Hoeppner
2013-05-24 6:32 ` keld
2013-05-24 7:37 ` Stan Hoeppner
2013-05-24 17:15 ` keld
2013-05-24 19:05 ` Stan Hoeppner
2013-05-24 19:22 ` keld
2013-05-25 1:42 ` Stan Hoeppner
2013-05-24 9:23 ` David Brown
2013-05-24 18:03 ` keld
2013-05-23 8:22 ` David Brown
2013-05-21 16:23 ` Doug Ledford
2013-05-21 17:03 ` Drew
[not found] ` <519BDC8C.1040202@hardwarefreak.com>
2013-05-21 21:02 ` Drew
2013-05-21 22:06 ` Stan Hoeppner
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