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From: Ian Rawlings on 24 Jun 2008 09:23 On 2008-06-24, jasee <jasee(a)btinternet.com> wrote: > All of which can be done without LVM with the possible exception of adding > multiple partitions to the same volume and (of course) software raiding, but > of course this is all dependent on the operating system understanding the > lvm file system which normal disk utilities don't. LVM doesn't have a file system, it just creates block devices of a size that you can change as you go along, even without dismounting the filesystem if you're using XFS, or with ext3 you do need to dismount the filesystem but no need to dismount all other filesystems on the disc and shuffle them all around. As far as I'm aware, you can't move your normal partitions around or migrate them from disc to disc while the system is live. Also while it does software RAID 0 (which is what I use it for), it doesn't do any other level. As far as normal partitions are concerned, you can't move them around, combine them and split them to suit without bringing the entire system down so you can feck about with the partition table. -- Blast off and strike the evil Bydo empire! http://youtube.com/user/tarcus69 http://www.flickr.com/photos/tarcus/sets/
From: jasee on 24 Jun 2008 11:54 Ian Rawlings wrote: > On 2008-06-24, jasee <jasee(a)btinternet.com> wrote: > >> All of which can be done without LVM with the possible exception of >> adding multiple partitions to the same volume and (of course) >> software raiding, but of course this is all dependent on the >> operating system understanding the lvm file system which normal disk >> utilities don't. > > LVM doesn't have a file system, it just creates block devices of a > size that you can change as you go along, even without dismounting the > filesystem if you're using XFS, or with ext3 you do need to dismount > the filesystem but no need to dismount all other filesystems on the > disc and shuffle them all around. As far as I'm aware, you can't move > your normal partitions around or migrate them from disc to disc while > the system is live. > > Also while it does software RAID 0 (which is what I use it for), it > doesn't do any other level. Haven't used it myself but according to wikipedia it will do raid1 (which is slightly more useful, if you trust software raid) > > As far as normal partitions are concerned, you can't move them around, > combine them and split them to suit without bringing the entire system > down so you can feck about with the partition table. You can of course do all this from a bootable cd running gnome partition editor or parted, however nothing can be done if it's all LVM
From: Nigel Wade on 24 Jun 2008 12:03 jasee wrote: > Ian Rawlings wrote: >> >> As far as normal partitions are concerned, you can't move them around, >> combine them and split them to suit without bringing the entire system >> down so you can feck about with the partition table. > > You can of course do all this from a bootable cd running gnome partition > editor or parted, however nothing can be done if it's all LVM Not without bringing the system down. -- Nigel Wade
From: jasee on 24 Jun 2008 12:14 Nigel Wade wrote: > jasee wrote: > >> Ian Rawlings wrote: > >>> >>> As far as normal partitions are concerned, you can't move them >>> around, combine them and split them to suit without bringing the >>> entire system down so you can feck about with the partition table. >> >> You can of course do all this from a bootable cd running gnome >> partition editor or parted, however nothing can be done if it's all >> LVM > > Not without bringing the system down. Yes
From: Ian Rawlings on 24 Jun 2008 12:05
On 2008-06-24, jasee <jasee(a)btinternet.com> wrote: > Haven't used it myself but according to wikipedia it will do raid1 (which is > slightly more useful, if you trust software raid) I'd trust software raid more than hardware raid, on the grounds that it's got better support tools normally (at least when you're running linux) and you've got a wealth of hardware that can take over the raid array in the event of hardware failure. A hardware raid card needs an identical card to be available before you can even start to try and recover from a hardware problem. As for raid 1, probably, I don't really keep track of them, but I know it won't do raid 5, I forgot about it doing mirroring, which is good because I want to do that and was going to look at software raid other than LVM.. >> As far as normal partitions are concerned, you can't move them around, >> combine them and split them to suit without bringing the entire system >> down so you can feck about with the partition table. > > You can of course do all this from a bootable cd running gnome partition > editor or parted, however nothing can be done if it's all LVM You *can't* of course do any of that from a bootable CD, as it requires the system to be *bought down* to do it. You have to *boot from the CD*, as you can't mess with the partitions *while the system is running*. Emphasis added as you've missed it twice so far, trying to make sure you don't miss it a third time. As for bootable CDs being unable to work with LVM, that's not the case at all. -- Blast off and strike the evil Bydo empire! http://youtube.com/user/tarcus69 http://www.flickr.com/photos/tarcus/sets/ |