Hi Neil that answers things nicely.
>From what you've said I think the watch phrase has got to be once a drive has >been incorporated into a virtual system by LVM there it should stay. Any need >to transfer data should be by either network or removeable media. This brings me to a further question, sorry! Can a LVM virtual drive be mounted by NFS? Ian -----Original Message----- From: ubuntu-uk-boun...@lists.ubuntu.com [mailto:ubuntu-uk-boun...@lists.ubuntu.com]on Behalf Of Neil Greenwood Sent: 16 May 2009 22:10 To: British Ubuntu Talk Subject: Re: [ubuntu-uk] LVD (maybe) 2009/5/16 Ian Pascoe <softy.lofty....@btinternet.com>: > Hi Al > > Ah-ha, everything becomes clearer with the right acronym! Thanks. > > However, still not too sure about things having read the documentation. > > Can someone confirm for me please that: > > - the disk / partition's metadata is left intact and correctly formatted so > that a physical drive can be moved between machines without problems - > presumeing the correct commands are issued to remove the drive from the > virtual drive; It's not without problems, but it can be done with a lot of CLI foo. IIRC, the main problem is if the 'new' machine also uses LVM and has the same VG names, it gets rather confused. If the new machine doesn't use LVM but has it available in the kernel, everything is much less complicated. > > and > > - when writing to the virtual disc, LVm won't split large files over > multiple physical partitions / drives unless specifically told to do so? I don't think you can guarantee this. There are various levels in LVM (from memory): PV physical volumes VG volume groups LV logical volumes You create a filesystem on an LV, which has to be in a single VG but might be split over multiple PVs. So a large file in the LV might end up with bits written to different PVs (i.e. disk partitions). > Ian HTH. Cofion/Regards, Neil. -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/ -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/
