Hi all!
I've recently noticed that recent versions of LVM include RAID
capabilities, so that one could presumably implement (e.g.) RAID-1
without having to use Linux Software RAID.
Given the complexity of LBM, I'm wondering how practical and how safe
this is (compared to Linux Software RAID), and also if anyone here knows
more about it than I do (which isn't much), and especially if anyone here
has actually used it??
I'd appreciate any feedback from y'all! :)
Thanks, Fred.
--
---- Fred Smith -- fredex at fcshome.stoneham.ma.us
-----------------------------
"Not everyone who says to me, 'Lord, Lord,' will enter the
kingdom of
heaven, but only he who does the will of my Father who is in heaven."
------------------------------ Matthew 7:21 (niv) -----------------------------
On Sat, Mar 28, 2015 at 08:48:52AM -0400, Fred Smith wrote:> Hi all! > > I've recently noticed that recent versions of LVM include RAID > capabilities, so that one could presumably implement (e.g.) RAID-1 > without having to use Linux Software RAID. > > Given the complexity of LBM, I'm wondering how practical and how safeoops: LVM> this is (compared to Linux Software RAID), and also if anyone here knows > more about it than I do (which isn't much), and especially if anyone here > has actually used it?? > > I'd appreciate any feedback from y'all! :) > > Thanks, Fred.-- ---- Fred Smith -- fredex at fcshome.stoneham.ma.us ----------------------------- Show me your ways, O LORD, teach me your paths; Guide me in your truth and teach me, for you are God my Savior, And my hope is in you all day long. -------------------------- Psalm 25:4-5 (NIV) --------------------------------
Hi, in Cent OS 7 after a power on, I experienced multiple errors in the device-mapper mirror: device lookup error and EXT4-fs error_lookup 1437 deleted inode reference I assume these are the VMs Is this always going to happen when I reboot the system? Will I experience data loss or corruption from this? Best, Stephen
On 3/28/2015 7:51 AM, Stephen wrote:> in Cent OS 7 > > after a power on, I experienced multiple errors > > in the device-mapper mirror: device lookup error > and EXT4-fs error_lookup 1437 deleted > inode referencedoes this have anything to do with Fred Smith's question about Using LVM to implement RAID ?? please start a new thread for a new topic, with an appropriate subject, don't reply to an unrelated post. -- john, recycling bits in santa cruz
It's a matter of user space tools preference. Both mdadm, and lvm tools use the Linux md driver code to implement RAID on the backend; but have completely different user facing tools and on-disk metadata. So it's best to be familiar with the troubleshooting and recovery process for each more than create, because that's where people get into trouble the most with both sets of tools. This thread might help: https://www.centos.org/forums/viewtopic.php?f=47&t=51349 -- Chris Murphy
Or ZFS.. http://zfsonlinux.org/ On 29 March 2015 at 03:37, Chris Murphy <lists at colorremedies.com> wrote:> It's a matter of user space tools preference. Both mdadm, and lvm > tools use the Linux md driver code to implement RAID on the backend; > but have completely different user facing tools and on-disk metadata. > So it's best to be familiar with the troubleshooting and recovery > process for each more than create, because that's where people get > into trouble the most with both sets of tools. This thread might help: > > https://www.centos.org/forums/viewtopic.php?f=47&t=51349 > > > > -- > Chris Murphy > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos >
On Sat, Mar 28, 2015 at 07:37:41PM -0600, Chris Murphy wrote:> It's a matter of user space tools preference. Both mdadm, and lvm > tools use the Linux md driver code to implement RAID on the backend; > but have completely different user facing tools and on-disk metadata. > So it's best to be familiar with the troubleshooting and recovery > process for each more than create, because that's where people get > into trouble the most with both sets of tools. This thread might help: > > https://www.centos.org/forums/viewtopic.php?f=47&t=51349Thanks Chris, that looks like good info. -- ------------------------------------------------------------------------------- .---- Fred Smith / ( /__ ,__. __ __ / __ : / / / / /__) / / /__) .+' Home: fredex at fcshome.stoneham.ma.us / / (__ (___ (__(_ (___ / :__ 781-438-5471 -------------------------------- Jude 1:24,25 ---------------------------------