Re: LVM RAID vs LVM over MD

From	Igor Cicimov <icicimov@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: LVM RAID vs LVM over MD
Date	2016-12-13 09:50 +0100
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On 12 Dec 2016 10:21 pm, "Jonathan Dowland" <jmtd@debian.org> wrote:

On Tue, Dec 06, 2016 at 10:53:30AM +1100, Igor Cicimov wrote:
> It depends. If you are using cloud services with remote shared storage
like
> AWS EBS it does not make sense using LVM on top of RAID. To me it is just
> adding complexity to already complex SAN storage. You also have no idea
> what the block devices presented to the VM are coming from it might be a
> file coming over iSCSI. I've been using LVM raid on AWS EBS for years
> without any issues. My advice is test and match them all before you make
> your decision each ones user case and experience is different.

I should have prefixed my answer with "If you want RAID...". I don't
personally use RAID anywhere, myself, at the moment.

In the situation you describe then you are doing logical volume management
elsewhere and you would indeed not need LVM. You should also address
redundancy
at that other layer so you wouldn't need (local) RAID either, either LVM or
MD
based, IMHO.

You don't explain why you chose to use LVM RAID over mdadm, but as I said, I
wouldn't use either in your case.

--
Jonathan Dowland
Please do not CC me, I am subscribed to the list.

It is not all about redundancy but performance too. In my tests the
lvm-raid performed better than plain lvm.

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Thread

LVM RAID vs LVM over MD kjonca@poczta.onet.pl (Kamil Jońca) - 2016-12-03 20:10 +0100
  Re: LVM RAID vs LVM over MD Henrique de Moraes Holschuh <hmh@debian.org> - 2016-12-03 22:50 +0100
    Re: LVM RAID vs LVM over MD kjonca@poczta.onet.pl (Kamil Jońca) - 2016-12-04 08:20 +0100
  Re: LVM RAID vs LVM over MD Sven Hartge <sven@svenhartge.de> - 2016-12-03 23:20 +0100
  Re: LVM RAID vs LVM over MD Roman Tsisyk <roman@tsisyk.com> - 2016-12-04 07:40 +0100
  Re: LVM RAID vs LVM over MD Jonathan Dowland <jmtd@debian.org> - 2016-12-05 11:30 +0100
    Re: LVM RAID vs LVM over MD Nicholas Geovanis <nickgeovanis@gmail.com> - 2016-12-05 20:20 +0100
      Re: LVM RAID vs LVM over MD Dan Ritter <dsr@randomstring.org> - 2016-12-05 20:40 +0100
        Re: LVM RAID vs LVM over MD Sven Hartge <sven@svenhartge.de> - 2016-12-05 21:00 +0100
          Re: LVM RAID vs LVM over MD Roman Tsisyk <roman@tsisyk.com> - 2016-12-05 21:10 +0100
            Re: LVM RAID vs LVM over MD Sven Hartge <sven@svenhartge.de> - 2016-12-05 21:40 +0100
      Re: LVM RAID vs LVM over MD Sven Hartge <sven@svenhartge.de> - 2016-12-05 20:50 +0100
      Re: LVM RAID vs LVM over MD Igor Cicimov <icicimov@gmail.com> - 2016-12-06 01:00 +0100
        Re: LVM RAID vs LVM over MD Jonathan Dowland <jmtd@debian.org> - 2016-12-12 12:30 +0100
          Re: LVM RAID vs LVM over MD Igor Cicimov <icicimov@gmail.com> - 2016-12-13 09:50 +0100

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