[ale] LVM: fumble fingered idiot problem

Dow Hurst dphurst at uncg.edu
Fri Sep 7 17:52:54 EDT 2012


This is the answer to my problem.

http://ubuntuforums.org/showthread.php?t=1533937

Sincerely,
Dow
________________________________________________
Dow Hurst, Research Scientist
340 Sullivan Science Bldg., Dept. of Chem. and Biochem.
University of North Carolina at Greensboro
PO Box 26170 Greensboro, NC 27402-6170




On Fri, Sep 7, 2012 at 1:21 PM, Dow Hurst <dphurst at uncg.edu> wrote:

> Matt,
> You've had to deal with LVM a lot more than I have so I'm asking for some
> thoughts.  I plugged up an external USB drive to the fileserver to create a
> partition table, format, and copy data over on to the USB drive.  Well, I
> looked at /proc/partitions and ran fdisk on /dev/sda instead of the right
> device, /dev/sdd.  I created a DOS partition table, created a single
> primary partition, synced and exited fdisk.  Then, I realized that /dev/sdd
> was the right device and it already had partitions and data.  Great.  So,
> I'm trying to figure out what the hell I just did to the file server.  It's
> still up and running but a reboot would probably be disastrous.  Anyway I
> have several pieces of data below relating to the devices, partitions, and
> lvm data.  I may have wiped out the system lvm data off of /dev/sda.  The
> fs1 volume shows but the system volume doesn't.  Does that make sense?  Is
> there a way to rewrite the lvm data?  Just remember that /dev/sda didn't
> have any partition table or partition, as shown below, before this moment.
>  I also think that the devices dm-0, sda, and lvm system are the same
> filesystem/devices that make up the /home where all the critical data is.
>  Sure, I have backups of the most important user directories using bacula,
> but not a mirror copy of everything as is.  I have archived copies of older
> data that would make up the difference, but what a stupid pain to have
> committed.  I'm wondering if this can be like grub, where reinstalling the
> master boot record doesn't harm the system.  How do you rewrite the lvm
> data without wiping out the mounted filesystem?
>
> Ubuntu 8.04
>
> //fs1> show
>
> Ctl   Model        (V)Ports  Drives   Units   NotOpt  RRate   VRate  BBU
> ------------------------------------------------------------------------
> c0    9550SXU-8LP  8         8        3       0       1       3      -
> //fs1> /c0 show
>
> Unit  UnitType  Status         %RCmpl  %V/I/M  Stripe  Size(GB)  Cache
>  AVrfy
>
> ------------------------------------------------------------------------------
> u0    RAID-5    VERIFY-PAUSED  -       0       64K     1862.61   ON     ON
>
> u1    SINGLE    VERIFY-PAUSED  -       0       -       465.651   ON     ON
>
> u2    RAID-1    VERIFY-PAUSED  -       0       -       232.82    ON     ON
>
>
> Port   Status           Unit   Size        Blocks        Serial
> ---------------------------------------------------------------
> p0     OK               u0     465.76 GB   976773168     WD-WCANU1733818
>
> p1     OK               u0     465.76 GB   976773168     WD-WCANU1733754
>
> p2     OK               u0     465.76 GB   976773168     WD-WCANU1735394
>
> p3     OK               u0     465.76 GB   976773168     WD-WCANU1888007
>
> p4     OK               u0     465.76 GB   976773168     WD-WCANU1735961
>
> p5     VERIFYING        u1     465.76 GB   976773168     WD-WCANU1731650
>
> p6     OK               u2     233.76 GB   490234752     WD-WCANY2372724
>
> p7     OK               u2     233.76 GB   490234752     WD-WCANY2774785
>
> root at fs1:/etc/lvm/backup# cat /proc/partitions
> major minor  #blocks  name
>
>    8     0 1953083392 sda
>    8     1 1953078246 sda1
>    8    16  488270848 sdb
>    8    32  244129792 sdc
>    8    33     248976 sdc1
>    8    34          1 sdc2
>    8    37  243874701 sdc5
>  254     0 1932738560 dm-0
>  254     1  240799744 dm-1
>  254     2    3072000 dm-2
>    8    48  488386584 sdd
>    8    49  488384001 sdd1
>
> root at fs1:/etc/lvm/backup# df -h
> Filesystem            Size  Used Avail Use% Mounted on
> /dev/mapper/fs1-root  228G   17G  201G   8% /
> varrun                501M   84K  501M   1% /var/run
> varlock               501M     0  501M   0% /var/lock
> udev                  501M   68K  501M   1% /dev
> devshm                501M     0  501M   0% /dev/shm
> /dev/sdc1             236M   26M  198M  12% /boot
> /dev/mapper/system-home
>                       1.8T  1.7T   71G  96% /home
> /dev/sdd1             459G   18G  418G   5% /mnt
>
> root at fs1:/etc/lvm/backup# pvdisplay
>   --- Physical volume ---
>   PV Name               /dev/sdc5
>   VG Name               fs1
>   PV Size               232.58 GB / not usable 2.89 MB
>   Allocatable           yes (but full)
>   PE Size (KByte)       4096
>   Total PE              59539
>   Free PE               0
>   Allocated PE          59539
>   PV UUID               PjgniS-zP39-TvRu-EabS-wv1Q-Un5g-ROMg6c
>
>
> root at fs1:~/tw# pvdisplay -m
>   --- Physical volume ---
>   PV Name               /dev/sdc5
>   VG Name               fs1
>   PV Size               232.58 GB / not usable 2.89 MB
>   Allocatable           yes (but full)
>   PE Size (KByte)       4096
>   Total PE              59539
>   Free PE               0
>   Allocated PE          59539
>   PV UUID               PjgniS-zP39-TvRu-EabS-wv1Q-Un5g-ROMg6c
>
>   --- Physical Segments ---
>   Physical extent 0 to 58788:
>     Logical volume /dev/fs1/root
>     Logical extents 0 to 58788
>   Physical extent 58789 to 59538:
>     Logical volume /dev/fs1/swap_1
>     Logical extents 0 to 749
>
>
> root at fs1:/etc/lvm/backup# cat fs1
> # Generated by LVM2: Tue Mar 29 17:45:03 2011
>
> contents = "Text Format Volume Group"
> version = 1
>
> description = "Created *after* executing '/sbin/vgcfgbackup'"
>
> creation_host = "fs1" # Linux fs1 2.6.24-19-server #1 SMP Wed Aug 20
> 18:43:06 UTC 2008 x86_64
> creation_time = 1301435103 # Tue Mar 29 17:45:03 2011
>
> fs1 {
> id = "7uN1mJ-igIG-pPaN-bpGX-bux9-uDzG-4FnyA9"
>  seqno = 3
> status = ["RESIZEABLE", "READ", "WRITE"]
>  extent_size = 8192 # 4 Megabytes
> max_lv = 0
>  max_pv = 0
>
> physical_volumes {
>
> pv0 {
> id = "PjgniS-zP39-TvRu-EabS-wv1Q-Un5g-ROMg6c"
>  device = "/dev/sdc5" # Hint only
>
> status = ["ALLOCATABLE"]
> dev_size = 487749402 # 232.577 Gigabytes
>  pe_start = 384
> pe_count = 59539 # 232.574 Gigabytes
>  }
> }
>
> logical_volumes {
>
>  root {
> id = "cIME9h-qhSB-HupF-KWVM-osd6-gVjA-xoHrQb"
>  status = ["READ", "WRITE", "VISIBLE"]
> segment_count = 1
>
> segment1 {
> start_extent = 0
>  extent_count = 58789 # 229.645 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 0
>  ]
> }
>  }
>
> swap_1 {
>  id = "Gd7qqR-ns4G-NaKW-ys57-vdXs-hm7N-1vFHRf"
> status = ["READ", "WRITE", "VISIBLE"]
>  segment_count = 1
>
> segment1 {
>  start_extent = 0
> extent_count = 750 # 2.92969 Gigabytes
>
> type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 58789
>  ]
> }
>  }
> }
> }
>
> root at fs1:/etc/lvm/backup# cat system
> # Generated by LVM2: Tue Mar 29 17:45:03 2011
>
> contents = "Text Format Volume Group"
> version = 1
>
> description = "Created *after* executing '/sbin/vgcfgbackup'"
>
> creation_host = "fs1" # Linux fs1 2.6.24-19-server #1 SMP Wed Aug 20
> 18:43:06 UTC 2008 x86_64
> creation_time = 1301435103 # Tue Mar 29 17:45:03 2011
>
> system {
> id = "VbCivG-iIUw-lPGB-6mT3-iUFd-p86P-pr7H52"
>  seqno = 2
> status = ["RESIZEABLE", "READ", "WRITE"]
>  extent_size = 8192 # 4 Megabytes
> max_lv = 0
>  max_pv = 0
>
> physical_volumes {
>
> pv0 {
> id = "N7YakG-Gi8X-0bt1-j8Uc-42GX-D8kU-RfOaR8"
>  device = "/dev/sda" # Hint only
>
> status = ["ALLOCATABLE"]
> dev_size = 9223372036854775807 # 4 (null)
>  pe_start = 384
> pe_count = 476826 # 1.81895 Terabytes
>  }
> }
>
> logical_volumes {
>
>  home {
> id = "FAnBXD-wDB7-0dbx-Hl0V-bwTu-Jace-a6pG0M"
>  status = ["READ", "WRITE", "VISIBLE"]
> segment_count = 1
>
> segment1 {
> start_extent = 0
>  extent_count = 471860 # 1.8 Terabytes
>
>  type = "striped"
> stripe_count = 1 # linear
>
> stripes = [
> "pv0", 0
>  ]
> }
>  }
> }
> }
>
>
>
> Sincerely,
> Dow
> ________________________________________________
> Dow Hurst, Research Scientist
> 340 Sullivan Science Bldg., Dept. of Chem. and Biochem.
> University of North Carolina at Greensboro
> PO Box 26170 Greensboro, NC 27402-6170
>
>
>
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