On Sun, Oct 08, 2006 at 10:15:22PM +0200, Jean-Luc Coulon (f5ibh) wrote: > Le 08.10.2006 18:05:23, [EMAIL PROTECTED] a ?crit?: > > > >Obviously, I don't know how LV works internally. If the root > >filesystem > >get corrupted, how do I fix it from a recovery shell (e.g. the install > >USB) if its on an LV? If this is trivial, then is the thing to do to > >make all of the disk a PV then have LVs for everything? > > It is probably a confidence problem. > A corrupted root file system is not better than a corrupted root over > LVM.
I'm confident that I don't know enough about LVM yet to rescue a mangled system. In the past, if something got corrupted (lightening strike, powerfailure, disk failure, etc), I could pop in my grub disk, and either boot my regular kernel or the one on the copy of /boot on a diferent drive, tell it root=/dev/hda5 init=/bin/sh and start fixing it. If that didn't work, I'd boot a rescue system (e.g. the install floppy or CD) and manually fsck the partitions. I suppose this is the key to my understanding and will make all clear: Where do I tell the grub disk (USB stick?) to find the kernel and what root= line do I give the kernel? With / and /boot part of LVM, how does grub find the kernel to boot? The grub-howto and docs don't mention LVM at all. With regular partitions, if the partition table gets corrupted, its simple to fix if I have what it looked like before using sfdisk -d (I never ran into this problem after the table corruption that prompted me to keep this information on a floppy with other essential backups). What is the LVM equivalent of this? The whole HOWTO package is getting woefully out of date. LVM-HOWTO doesn't cover recovering from errors, MULTI-DISK-HOWTO doen't cover LVM, and the various recovery howtos focus on bare-metal recovery not fixing a broken system. Or, it it the case now that LVM is so reliable that any errors will be hardware and unrecoverable anyway, requiring a bare-metal recovery. Thanks, Doug. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
