[linux-lvm] LVM/RAID again

Tim tim at connectlive.com
Wed Mar 6 17:13:01 UTC 2002

Having used and despised VxVM on Solaris before, and finding out about
Heartbeat since then, I'd look into attached enclosures shared
physically on a SCSI bus (there is an article in SysAdmin magazine that
I used for my starting point) and serial heartbeats across the nodes, if
the cluster is simple enough...  if not post to the linux-HA list :-)

Quoth Frank Lenaerts:
> I've been reading several LVM/RAID postings on this mailinglist to
> find out if someone else is also having the same question as I have,
> but this does not seem to be the case; I hope this is the right place
> to ask this.
> As LVM does not provide RAID1 (etc.) as VXVM does with its plexes, I
> wanted to use LVM on top of the standard Linux metadevices
> (RAID1). However, I wanted to do this for a cluster system using a
> shared SCSI bus. I am aware of the fact that ownership of disks is
> important, while something like LVM actually tries to abstract this
> away, but I want to use LVM to be able to extend the filesystem, to
> take snapshot backups etc.. The problem I currently face however, is
> the fact that both nodes autodetect the metadevices and start syncing
> the mirrors, independently of each other (I do not have the LVM and
> cluster software installed on these machines yet). The synchronization
> however, is initiated by the raidstart command, that is true (it is
> not the detection itself which does this), but I wonder how I should
> solve this problem. Below, some ideas that come to my mind:
> - do not use LVM at all, just use the physical disks instead
> - have two separate raidtab files where each of them is only "owned"
>   by a single node (to prevent syncing problems) and only start the
>   raid for a certain metadevice when a logical volume is imported on a
>   node
> What do you think about this?
> -- 
> frank.lenaerts at advalvas.be

     "To be suspended from the legal profession is the moral equivalent of 
      being ostracized by child molesters."
                                                           --Ian Rowan

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