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тАО04-02-2011 09:39 AM
тАО04-02-2011 09:39 AM
lvm configuration
Hi all,
I used LVM to configure a shared disk array (MSAP2000). But when I create a file on the shared disk from noeud1 (linux redhat 5), I do not see the same file from the second node.
i need some assistance please
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тАО04-02-2011 09:47 AM
тАО04-02-2011 09:47 AM
Re: lvm configuration
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тАО04-02-2011 03:42 PM
тАО04-02-2011 03:42 PM
Re: lvm configuration
Regards.
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тАО04-03-2011 02:29 AM
тАО04-03-2011 02:29 AM
Re: lvm configuration
All the non-cluster filesystems have a very strong designed-in assumption that the filesystem is only mounted on *one node at a time* only.
MK
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тАО04-03-2011 05:28 AM
тАО04-03-2011 05:28 AM
Re: lvm configuration
Red Hat GFS allows a cluster of Linux servers to share data in a common pool of storage -- see http://www.redhat.com/gfs/. The Cluster Logical Volume Manager (CLVM) provides a cluster-wide version of LVM2. CLVM provides the same capabilities as LVM2 on a single node, but makes the volumes available to all nodes in a Red Hat cluster. The logical volumes created with CLVM make logical volumes available to all nodes in a cluster. See https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html/Cluster_Suite_Overview/s1-clvm-overview-CSO.html.
HTH,
Ross
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тАО04-03-2011 08:03 AM
тАО04-03-2011 08:03 AM
Re: lvm configuration
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тАО04-03-2011 10:53 AM
тАО04-03-2011 10:53 AM
Re: lvm configuration
You might get away with a failover config, where it is mounted on one node, and upon some sort of failover, it's activated and mounted on another node - this is left as an exercise for the reader.
If you need an active-active mount, you need a cluster aware filesystem, such as GFS (see the information posted by others above - they've already answered your questions.
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тАО04-03-2011 12:36 PM
тАО04-03-2011 12:36 PM
Re: lvm configuration
sure you customer can use EXT3 within a cluster... but only one node can mount it at a given time. So in case of a failover, the filesystem is re-mounted on the failover node. EXT3 can't be accessed by more then one node at the same time. That's impossible. Use a cluster-aware filesystem like Oracle OCFS2 or GFS.
Regards,
Patrick
Patrick
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тАО04-03-2011 11:07 PM
тАО04-03-2011 11:07 PM
Re: lvm configuration
If you don't want to use a cluster filesystem, you may also sync two volumes via rsync or DRBD (distributed redundant block device: think of RAID1 via LAN)
Usually you can't open a LVM volume on multiple devices as the volume will get locked on the first mount.
Not only the filesystem needs to be clusteraware but also the volume manager. Use clvmd that is part of the Red Hat cluster suite.
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тАО04-05-2011 02:17 AM
тАО04-05-2011 02:17 AM
Re: lvm configuration
Can you give me a script to mount and dismount files system. How can i setup those scripts?
bests regards
Ats1