Looks like a dmraid setup. Googling Linux isw found me a rebuild guide. <div class="gmail_quote">On 06/11/2012 9:05 AM, "Randy Schultz" <<a href="mailto:schulra@earlham.edu">schulra@earlham.edu</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> Hey all, I have a system that somebody set up, reportedly during the RHEL install, to have the 2 on-board drives mirrored. We lost the second drive. I know how to do deal with this on a standard setup with 2 PV's, but it looks like there is only 1 PV and I cannot find any documentation on how to deal with this. The system has 2 drives partitioned this way: ? fdisk -l Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 121600 976647577+ 8e Linux LVM Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sdb1 * 1 13 104391 83 Linux /dev/sdb2 14 121600 976647577+ 8e Linux LVM The fstab mounts things as: ? cat /etc/fstab /dev/VolGroup00/LogVol00 / ext3 defaults 1 1 /dev/VolGroup00/LogVol02 /var ext3 defaults 1 2 /dev/VolGroup00/LogVol03 /opt ext3 defaults 1 2 LABEL=/boot /boot ext3 defaults 1 2 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0 /dev/VolGroup00/LogVol01 swap swap defaults 0 0 giving these mountpoints: ? df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 24G 9.1G 14G 41% / /dev/mapper/VolGroup00-LogVol02 24G 555M 22G 3% /var /dev/mapper/VolGroup00-LogVol03 770G 45G 686G 7% /opt /dev/mapper/isw_ccebcbejfi_Volume0p1 99M 26M 69M 28% /boot tmpfs 14G 0 14G 0% /dev/shm There are no md devices: ? cat /proc/mdstat Personalities : unused devices: <none> DMsetup shows: ? dmsetup status isw_ccebcbejfi_Volume0p2: 0 1953295155 linear isw_ccebcbejfi_Volume0p1: 0 208782 linear VolGroup00-LogVol03: 0 1666580480 linear VolGroup00-LogVol02: 0 51183616 linear VolGroup00-LogVol01: 0 184287232 linear VolGroup00-LogVol00: 0 51183616 linear isw_ccebcbejfi_Volume0: 0 1953519352 mirror 2 8:0 8:16 14905/14905 1 AR 1 core Here's where things get weird. Pvscan shows only 1 device: ? pvscan -v Wiping cache of LVM-capable devices Wiping internal VG cache Walking through all physical volumes PV /dev/mapper/isw_ccebcbejfi_Volume0p2 VG VolGroup00 lvm2 [931.38 GB / 0 free] Total: 1 [931.38 GB] / in use: 1 [931.38 GB] / in no VG: 0 [0 ] So, if I understand this correctly, sda2 and sdb2 were tied together somehow as a mirror, then this was presented to lvm as the PV. Cool, but how do I swap out sdb?! -- Randy (<a href="mailto:schulra@earlham.edu" target="_blank">schulra@earlham.edu</a>) 765.983.1283 <*> nosce te ipsum _______________________________________________ linux-lvm mailing list <a href="mailto:linux-lvm@redhat.com" target="_blank">linux-lvm@redhat.com</a> <a href="https://www.redhat.com/mailman/listinfo/linux-lvm" target="_blank">https://www.redhat.com/mailman/listinfo/linux-lvm</a> read the LVM HOW-TO at <a href="http://tldp.org/HOWTO/LVM-HOWTO/" target="_blank">http://tldp.org/HOWTO/LVM-HOWTO/</a> </blockquote></div>