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On Nov,Tuesday 6 2007, at 3:07 AM, Albert Hopkins wrote: |
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> |
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> On Mon, 2007-11-05 at 18:01 -0500, Eric S. Johansson wrote: |
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> |
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>> |
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>> given that I frequently play the role of the heretic (complete with |
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>> burn scars |
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>> all over my body and various bits of damage from the weapons of |
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>> true believers) |
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>> I think it's a good thing that EVMS is slated for the trash heap. |
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>> It's a |
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>> classic example of "second system syndrome" as defined by "the |
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>> mythical Man |
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>> month". It's overly complicated, poorly documented, and has a |
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>> terrible user |
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>> interface that only a geek would even consider using. |
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>> |
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>> Having said that, I also think LVMS suffers from many if not all of |
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>> the same |
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>> problems that plagued EVMS. it is been around for years and still |
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>> the |
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>> documentation on how to perform common operations is lacking. It's |
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>> a chicken |
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>> and egg problem. You need to understand LVMS in order to |
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>> understand the |
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>> documentation and then you can't explain it to anyone else. Every |
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>> time I've |
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>> used LVMS, it takes me the same number of hours to relearn the same |
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>> old pieces |
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>> of obscure command syntax and become comfortable that I'm not going |
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>> to trash my |
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>> disk. As a result, I don't use LVMS either. |
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>> |
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> I've never used EVMS so I can't comment at all on it. However I have |
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> been using LVM for years and one of the few good things I can say |
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> about |
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> it is that its pretty small, easy, and predictable. In fact one of the |
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> negative things I'd have to say about it is that it's *too* simple |
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> (a LV |
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> defrag tool would be nice). I really don't understand the complexity |
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> you speak of. It's pretty well documented, and has a fairly high |
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> user-base. |
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> |
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> I do agree though that, based on this ML and IRC discussions, many |
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> times |
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> I'll see a person who wants to use LVM and perhaps maybe they don't |
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> need |
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> it, and they get frustrated because they're using the wrong tool for |
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> the |
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> job. Myself: I have a 8 2-disk RAID volumes with LVM on top. If I |
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> need |
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> to expand my VG, I just pop in a couple of new drives, to an |
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> lvextend on |
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> a volume and then "mount -o remount,resize" and voila! |
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> |
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> On another machine I have xen and I have 2 VGs: a set of disks for the |
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> Host and a set for the VMs. I have some VMs in a DMZ, and I can't |
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> reach |
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> them from the host, but I use LVM to create snapshots of their disks |
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> and |
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> make backup of them. LVM makes it damn easy. In some ways LVM is |
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> like a |
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> poor-man's SAN for Xen VMs. You can carve out a LV, assign it to a |
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> VM, |
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> and resize, hot-add or hot-remove them as you please. |
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> |
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> But again, the average person with a single disk running on a laptop |
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> computer probably has no use for LVM. |
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> |
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> Pretty much every major "server" OS has volume management (including |
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> Windows) because a lot of users at that level need it. Linu LVM, I |
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> think, is very similar to HP-UX LVM at the command level. |
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AFAIK an who has written linux LVM worked for HP. |
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|
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Regards |
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|
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Adam. |
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-- |
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