From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx14.extmail.prod.ext.phx2.redhat.com [10.5.110.43]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 5CD281001B18 for ; Tue, 2 Jul 2019 15:54:05 +0000 (UTC) Received: from mail.ctc.grnoc.iu.edu (eth-0-1.mail.ictc.indiana.gigapop.net [149.165.134.75]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id C2DB5309264D for ; Tue, 2 Jul 2019 15:53:31 +0000 (UTC) Received: from [127.0.0.1] (localhost [127.0.0.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: jdratlif) by mail.ctc.grnoc.iu.edu (Postfix) with ESMTPSA id 45dTKs4XBwzB3Htj for ; Tue, 2 Jul 2019 15:53:21 +0000 (UTC) Date: Tue, 02 Jul 2019 11:53:21 -0400 From: John Ratliff Message-ID: Mime-version: 1.0 Content-type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha256; boundary="B_3644913201_1012273556" Subject: [linux-lvm] Lvm RAID0 vs lvm striping Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: To: linux-lvm@redhat.com > This message is in MIME format. Since your mail reader does not understand this format, some or all of this message may not be legible. --B_3644913201_1012273556 Content-type: multipart/alternative; boundary="B_3644913201_1624945521" --B_3644913201_1624945521 Content-type: text/plain; charset="UTF-8" Content-transfer-encoding: 7bit What is the difference between these two? Thanks. John Ratliff --B_3644913201_1624945521 Content-type: text/html; charset="UTF-8" Content-transfer-encoding: quoted-printable

What is the= difference between these two?

 

Thanks.

=  

John Ratliff

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cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id EE8BCC18B2EE for ; Wed, 3 Jul 2019 15:45:12 +0000 (UTC) Received: by mail-wr1-f48.google.com with SMTP id v14so3391893wrr.4 for ; Wed, 03 Jul 2019 08:45:12 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Chris Murphy Date: Wed, 3 Jul 2019 09:45:00 -0600 Message-ID: Subject: Re: [linux-lvm] Lvm RAID0 vs lvm striping Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: LVM general discussion and development On Wed, Jul 3, 2019 at 2:33 AM John Ratliff wrote: > > What is the difference between these two? > If the question is about segment type, raid0 and raid1 use the md driver code (same kernel code the mdadm raid uses, but is managed with LVM metadata and user space tools). And striped and mirror use an internal implementation, although I'm not sure if this is internal to LVM or device-mapper, and I think are considered legacy at this point. 'man 7 lvmraid' doesn't directly answer your question but contains quite a lot of information about lvmraid. It does explicitly say to use raid1 over mirror segment type. It doesn't say that about raid0 vs stripe segment type, maybe the two implementations aren't all that different but anyway I would use raid0. -- Chris Murphy From mboxrd@z Thu Jan 1 00:00:00 1970 References: From: Heinz Mauelshagen Message-ID: Date: Fri, 5 Jul 2019 00:45:49 +0200 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/alternative; boundary="------------F15A7C66C50E94A22C0CC535" Content-Language: en-MW Subject: Re: [linux-lvm] Lvm RAID0 vs lvm striping Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: To: LVM general discussion and development , John Ratliff This is a multi-part message in MIME format. --------------F15A7C66C50E94A22C0CC535 Content-Type: text/plain; charset="utf-8"; format="flowed" Content-Transfer-Encoding: 8bit This is both striping via 2 different, supported device-mapper targets, 'striped' and 'raid' ('striped' is  an older, separate target and  'raid0' is supported by the 'raid' target which  also supports raid1/raid4/raid5/raid6 and raid10). The algorithm to distribute data on the stripes is the same for both striped and raid0 and they can be converted into each other running 'lvconvert --type striped|raid0 $LV' since raid target version 1.7.0 / lvm2 version 2.02.155. See lvmraid(7) for insight into the RAID support in lvm including the aforementioned and many more conversions from and to RAID and between RAID levels and layouts.. Heinz On 7/2/19 5:53 PM, John Ratliff wrote: > > What is the difference between these two? > > Thanks. > > John Ratliff > > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ --------------F15A7C66C50E94A22C0CC535 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: 8bit

This is both striping via 2 different, supported device-mapper targets, 'striped' and 'raid'
('striped' is  an older, separate target and  'raid0' is supported by the 'raid' target which
 also supports raid1/raid4/raid5/raid6 and raid10).

The algorithm to distribute data on the stripes is the same for both striped and raid0
and they can be converted into each other running 'lvconvert --type striped|raid0 $LV'
since raid target version 1.7.0 / lvm2 version 2.02.155.

See lvmraid(7) for insight into the RAID support in lvm including the aforementioned
and many more conversions from and to RAID and between RAID levels and layouts..

Heinz

On 7/2/19 5:53 PM, John Ratliff wrote:

What is the difference between these two?

 

Thanks.

 

John Ratliff


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read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/

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