From: Heinz Mauelshagen <heinzm@redhat.com>
To: dm-devel@redhat.com
Subject: Re: raid1 round-robin scheduler
Date: Thu, 19 Feb 2015 16:02:20 +0100 [thread overview]
Message-ID: <54E5FAFC.3010800@redhat.com> (raw)
In-Reply-To: <54E58F6A.9040108@clodo.ru>
dm-mirror (i.e. "lvcreate --type mirror" or respective "dmsetup create
--table ...",
which is not the recommended raid1 layout any more) provides read
round-robin since long time.
You'd need an ancient kernel not to have it supported.
"raid1"/"raid10" (the recommended targets) , i.e. the md-raid based
mappings accessible via the dm-raid target
do read optimizations as well. Use "lvcreate --type raid1/raid10 ..." or
a respective dm table to set
those up. The former ("raid1") is the default in modern distributions
and configurable via setting
'mirror_segtype_default = "raid1"' in /etc/lvm/lvm.conf.
Heinz
On 02/19/2015 08:23 AM, konstantin wrote:
> What version of the kernel should I use to get a round-robin read
> implementation on LV raid1?
>
next prev parent reply other threads:[~2015-02-19 15:02 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-19 7:23 raid1 round-robin scheduler konstantin
2015-02-19 15:02 ` Heinz Mauelshagen [this message]
2015-03-10 11:55 ` konstantin
2015-03-10 14:22 ` Heinz Mauelshagen
2015-03-11 7:22 ` konstantin
2015-03-11 10:55 ` Heinz Mauelshagen
2015-03-11 12:44 ` konstantin
-- strict thread matches above, loose matches on Subject: below --
2014-12-05 12:25 Vasiliy Tolstov
2014-12-05 12:38 ` Vasiliy Tolstov
2014-12-05 13:02 ` Bryn M. Reeves
2014-12-05 13:06 ` Zdenek Kabelac
2014-12-05 13:10 ` Vasiliy Tolstov
2014-12-05 13:08 ` Vasiliy Tolstov
2014-12-05 14:34 ` Bryn M. Reeves
2014-12-05 22:10 ` Vasiliy Tolstov
2014-12-08 12:23 ` Bryn M. Reeves
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