From mboxrd@z Thu Jan 1 00:00:00 1970 From: Heinz Mauelshagen Subject: Re: dm_mirror/dm_raid1 limitations ?. Date: Mon, 26 Jan 2015 15:16:47 +0100 Message-ID: <54C64C4F.6090601@redhat.com> References: <4d982ea8-3769-46d2-ba73-2d1525faa63b@default> Reply-To: device-mapper development Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============6474000732995191182==" Return-path: In-Reply-To: <4d982ea8-3769-46d2-ba73-2d1525faa63b@default> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dm-devel-bounces@redhat.com Errors-To: dm-devel-bounces@redhat.com To: dm-devel@redhat.com List-Id: dm-devel.ids This is a multi-part message in MIME format. --===============6474000732995191182== Content-Type: multipart/alternative; boundary="------------000108070005060602040100" This is a multi-part message in MIME format. --------------000108070005060602040100 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit On 01/26/2015 02:51 PM, Suresh Babu Kandukuru wrote: > > Use case is : Two luns are mapped from storage array to linux host > which are in same SAN fabric . we want to create a mirror on the linux > host with these two luns and let host use that mirror lun . basic > tests suggest that dm_mirror working fine . when we have any > intermittent path issues with between host and san array , host i/o > just freeze , never returns back even after the path is online. > Hard to tell what's happening without any kernel log. > Is dm_mirror viable solution here ?. Can you point me any link which > gives the limitations of dm_mirror ? . another alternate solutions you > propose here ?. Thanks in advance . > We've switched the default away from "mirror" to "raid1" in order to take advantage of th MD runtime. Have you tested "lvcreate --type raid1 ..." yet? Please do. Regards, Heinz > Thanks > > /Suresh > > > > -- > dm-devel mailing list > dm-devel@redhat.com > https://www.redhat.com/mailman/listinfo/dm-devel --------------000108070005060602040100 Content-Type: text/html; charset=windows-1252 Content-Transfer-Encoding: quoted-printable X-MIME-Autoconverted: from 8bit to quoted-printable by mx4-phx2.redhat.com id t0QEGp56020467
On 01/26/2015 02:51 PM, Suresh Babu Kandukuru wrote:

Use case is : Two luns are mapped from storage array to linux host which are in same SAN fabric . we want to create a mirror on the linux host with these two luns and let=A0 host use that mirror lun .=A0 basic tests suggest th= at dm_mirror working fine . when we have any intermittent path issues with between host and san array , host i/o just freeze , never returns back even after the path is online.=A0


Hard to tell what's happening without any kernel log.

=A0

Is dm_mirror viable solution here =A0?. Ca= n you point me any link which gives the limitations of dm_mirror ? . another alternate solutions you propose here ?. Thanks in advance .


We've switched the default away from "mirror" to "raid1" in order to take advantage of th MD runtime.
Have you tested=A0 "lvcreate --type raid1 ..." yet?
Please do.

Regards,
Heinz

=A0

Thanks

/Suresh



--
dm-devel mailing list
dm-devel@redhat.com
https://www.redhat.com/mailman/listinfo/dm-devel<=
/pre>

--------------000108070005060602040100-- --===============6474000732995191182== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Disposition: inline Content-Transfer-Encoding: 7bit --===============6474000732995191182==--