-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On Tue, 28 Oct 2003, Gert van der Knokke wrote: > John Stoffel wrote: > >Gert> I didn't expect lvm to restore the missing data, I guessed it > >Gert> would just let me access the rest of the data. > > > >At this point, you have to think, how can my filesystem cope with the > >loss of a 60gb chunk of data in the middle (start or end even) of the > >300+ gb of data? There's all sorts of meta-data and true data which > >is now gone, and re-building the filesystem into a consistent state is > >really impossible. > > > Hmm, and so I think LVM still needs a warning label :-) Maybe, in the same way that McDonald's now feels compelled to remind its customers that hot coffee is hot. I don't recall anything in the description of LVM which suggests that it provides redundancy or other data-protection mechanisms. RAID, regular backups, and retention of distribution media are still required if you value your data. > I wonder why LVM doesn't work the other way around: > Create filesystems on several disks and then concatenate these to the > outside as one large filesystem. This way if one drive goes bad you can > always individually mount the drives and use the data. man mount > >If you are looking for a large/cheap/reliable bunch of storage, > >instead of mirroring, you might want to think about RAID5 instead. > > > No, what we're looking for is an 'expandable as needed' filesystem and > this is what LVM pretends to be. That's what it *is*. You can slice and dice your physical storage and recombine as needed. Do that to redundant physical storage and you have a highly reliable expandable storage stack. Do it to a simple concatenation of cheap disks and you have a cheap failure-prone expandable storage stack. Expandability and reliability are orthogonal, and you use separate tools to provide them. - -- Mark H. Wood, Lead System Programmer mwood@IUPUI.Edu MS Windows *is* user-friendly, but only for certain values of "user". -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.2 (GNU/Linux) Comment: pgpenvelope 2.10.2 - http://pgpenvelope.sourceforge.net/ iD8DBQE/noNls/NR4JuTKG8RAjZZAJ9/bdnzRL07utWgLrw0FKR3Jw2hFQCaAwMr +J7f6p3l6Arpds78jK2TKgE= =QaKC -----END PGP SIGNATURE----- _______________________________________________ linux-lvm mailing list linux-lvm@sistina.com http://lists.sistina.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
