[linux-lvm] Help after disk crash

[BoD <BoD@JRAF.org>]

Hi!
I recently bought a new hard drive and used LVM to add it to my system. 
Unfortunately the disk just crashed. This is not too bad since I have a 
backup of the most important files.
But currently my system can't work correctly as the crashed disk 
belonged to the vg that contains /usr, /home, /opt, /var and /tmp. (It 
also contains a /docs which I have a backup of, so it doesn't matter if 
I lose it.) The system still boots though and I can login as root.

The vg is on pv0, pv1 and pv2 - It is pv2 that crashed.
I am kind of a newbie so I don't know how to proceed, but I believe it 
should be possible to resize the vg to only use the first 2 pvs.

 From what I see on my /etc/lvm/backup/vg file (see below), it seems 
that only the 'docs' lv uses pv2, I think it is a good sign, right?

So far, after googling a bit I tried vgscan -P and vgchange -Pay and 
tried to mount /dev/vg/usr but it didn't work with the following error: 
EXT3-fs: INFO: recovery required on readonly filesystem. / write access 
unavailable, cannot proceed.

Any help is greatly appreciated! Thanks a lot.

BoD



Here is my /etc/lvm/backup/vg:
==================
# Generated by LVM2 version 2.02.36 (2008-04-29): Sat Nov 15 17:19:28 2008

contents = "Text Format Volume Group"
version = 1

description = "Created *after* executing 'lvextend /dev/vg/docs /dev/sda'"

creation_host = "server"    # Linux server 2.6.25-gentoo-r7 #3 SMP Mon 
Nov 10 01:14:23 CET 2008 i686
creation_time = 1226765968    # Sat Nov 15 17:19:28 2008

vg {
    id = "PH2tSI-13yC-X0oh-vn11-a0n6-1ho5-6UiCs9"
    seqno = 15
    status = ["RESIZEABLE", "READ", "WRITE"]
    extent_size = 8192        # 4 Megabytes
    max_lv = 0
    max_pv = 0

    physical_volumes {

        pv0 {
            id = "eGnP16-zOOk-CR6Y-sDib-27kL-T83J-d6oRp9"
            device = "/dev/hda4"    # Hint only

            status = ["ALLOCATABLE"]
            dev_size = 223656930    # 106.648 Gigabytes
            pe_start = 384
            pe_count = 27301    # 106.645 Gigabytes
        }

        pv1 {
            id = "6DnMKc-Rpb2-Rq52-xsXY-3Nrw-ZJoZ-YAwf1C"
            device = "/dev/hdb1"    # Hint only

            status = ["ALLOCATABLE"]
            dev_size = 240107427    # 114.492 Gigabytes
            pe_start = 384
            pe_count = 29309    # 114.488 Gigabytes
        }

        pv2 {
            id = "9RSjlM-bZ8W-8cC0-s122-bYTo-jyci-DZOSpM"
            device = "/dev/sda"    # Hint only

            status = ["ALLOCATABLE"]
            dev_size = 1953525168    # 931.513 Gigabytes
            pe_start = 384
            pe_count = 238467    # 931.512 Gigabytes
        }
    }

    logical_volumes {

        usr {
            id = "0CY7Ox-x0UG-LVXl-jhEk-IrJG-ig8l-ELPI3C"
            status = ["READ", "WRITE", "VISIBLE"]
            segment_count = 2

            segment1 {
                start_extent = 0
                extent_count = 2560    # 10 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv1", 0
                ]
            }
            segment2 {
                start_extent = 2560
                extent_count = 1280    # 5 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv1", 4352
                ]
            }
        }

        home {
            id = "C26mF3-f25l-K3ct-NgKQ-A6Mb-OgOn-ZtqlAt"
            status = ["READ", "WRITE", "VISIBLE"]
            segment_count = 1

            segment1 {
                start_extent = 0
                extent_count = 1280    # 5 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv0", 0
                ]
            }
        }

        opt {
            id = "9xQxKJ-KrpD-iDny-6SAh-dFyY-4URm-0qAH6l"
            status = ["READ", "WRITE", "VISIBLE"]
            segment_count = 1

            segment1 {
                start_extent = 0
                extent_count = 1280    # 5 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv1", 2560
                ]
            }
        }

        var {
            id = "1Vt3kw-xlHL-Rh66-cYoQ-f5QP-5D9f-Inan21"
            status = ["READ", "WRITE", "VISIBLE"]
            segment_count = 1

            segment1 {
                start_extent = 0
                extent_count = 2560    # 10 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv0", 1280
                ]
            }
        }

        tmp {
            id = "QcoIcV-tSUP-iJ9J-MjZE-cI0n-8fEG-20Gb08"
            status = ["READ", "WRITE", "VISIBLE"]
            segment_count = 1

            segment1 {
                start_extent = 0
                extent_count = 512    # 2 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv1", 3840
                ]
            }
        }

        docs {
            id = "5xHiv1-uzBg-kd8c-jdJQ-QuOa-eFei-w4hUbl"
            status = ["READ", "WRITE", "VISIBLE"]
            segment_count = 3

            segment1 {
                start_extent = 0
                extent_count = 23677    # 92.4883 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv1", 5632
                ]
            }
            segment2 {
                start_extent = 23677
                extent_count = 23461    # 91.6445 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv0", 3840
                ]
            }
            segment3 {
                start_extent = 47138
                extent_count = 238467    # 931.512 Gigabytes

                type = "striped"
                stripe_count = 1    # linear

                stripes = [
                    "pv2", 0
                ]
            }
        }
    }
}