08-17-2007
Bad magic number on /dev/md0
Hello All,
(RHEL4)
Few weeks ago I had posted a message in this forum about the problem I had when I replaced my two scsi disks and tried rebuild raid1 array.
I somehow managed to up the system with working raid1 array.
But the main problem persisted..
i.e when I reboot the system, mounting of /dev/md0 fails.
The error message says the superblock no. is wrong and it is expecting ext2 file system.
After this, I login in rescue mode(which the os provided me as soon as mount of /dev/md0 failed).
Once I login, I have to recreate the raid1 array using
mdadm --create /dev/md0 --level=raid1 --raid-devices=2 /dev/sdb1 /dev/sdc1
The above command successfully creates raid1 array after which I mount it to my /home directory.
Now everything works fine(until I restart)
(After full synchronization)
$cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sdc1[1] sdb1[0]
17782656 blocks [2/2] [UU]
unused devices: <none>
#mdadm -E /dev/sdb1
/dev/sdb1:
Magic : a92b4efc
Version : 00.90.00
UUID : 979caf2d:1be05876:14d74325:14ea3ec1
Creation Time : Fri Aug 10 15:47:52 2007
Raid Level : raid1
Device Size : 17782656 (16.96 GiB 18.21 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Fri Aug 17 17:11:05 2007
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 14fdc667 - correct
Events : 0.92278
Number Major Minor RaidDevice State
this 0 8 17 0 active sync /dev/sdb1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
# mdadm -E /dev/sdc1
/dev/sdc1:
Magic : a92b4efc
Version : 00.90.00
UUID : 979caf2d:1be05876:14d74325:14ea3ec1
Creation Time : Fri Aug 10 15:47:52 2007
Raid Level : raid1
Device Size : 17782656 (16.96 GiB 18.21 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 0
Update Time : Fri Aug 17 17:13:11 2007
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Checksum : 14fdc713 - correct
Events : 0.92292
Number Major Minor RaidDevice State
this 1 8 33 1 active sync /dev/sdc1
0 0 8 17 0 active sync /dev/sdb1
1 1 8 33 1 active sync /dev/sdc1
#cat /etc/mdadm.conf
DEVICE /dev/sdb1 /dev/sdc1
ARRAY /dev/md0 level=raid1 num-devices=2 UUID=979caf2d:1be05876:14d74325:14ea3ec1
#mdadm -E /dev/md0
mdadm: No super block found on /dev/md0 (Expected magic a92b4efc, got 764e5679)
Any help will be appreciated.
(Since I'm relieving from my current position I need to correct this problem...I don't want to pass this problem to my successor)
Regards,
Ravinandan S
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GITK(1) Git Manual GITK(1)
NAME
gitk - The git repository browser
SYNOPSIS
gitk [<option>...] [<revs>] [--] [<path>...]
DESCRIPTION
Displays changes in a repository or a selected set of commits. This includes visualizing the commit graph, showing information related to
each commit, and the files in the trees of each revision.
Historically, gitk was the first repository browser. It's written in tcl/tk and started off in a separate repository but was later merged
into the main git repository.
OPTIONS
To control which revisions to show, the command takes options applicable to the git rev-list command (see git-rev-list(1)). This manual
page describes only the most frequently used options.
-n <number>, --max-count=<number>
Limits the number of commits to show.
--since=<date>
Show commits more recent than a specific date.
--until=<date>
Show commits older than a specific date.
--all
Show all branches.
--merge
After an attempt to merge stops with conflicts, show the commits on the history between two branches (i.e. the HEAD and the MERGE_HEAD)
that modify the conflicted files and do not exist on all the heads being merged.
--argscmd=<command>
Command to be run each time gitk has to determine the list of <revs> to show. The command is expected to print on its standard output a
list of additional revs to be shown, one per line. Use this instead of explicitly specifying <revs> if the set of commits to show may
vary between refreshes.
--select-commit=<ref>
Automatically select the specified commit after loading the graph. Default behavior is equivalent to specifying --select-commit=HEAD.
<revs>
Limit the revisions to show. This can be either a single revision meaning show from the given revision and back, or it can be a range
in the form "<from>..<to>" to show all revisions between <from> and back to <to>. Note, more advanced revision selection can be
applied. For a more complete list of ways to spell object names, see gitrevisions(7).
<path>...
Limit commits to the ones touching files in the given paths. Note, to avoid ambiguity with respect to revision names use "--" to
separate the paths from any preceding options.
EXAMPLES
gitk v2.6.12.. include/scsi drivers/scsi
Show the changes since version v2.6.12 that changed any file in the include/scsi or drivers/scsi subdirectories
gitk --since="2 weeks ago" -- gitk
Show the changes during the last two weeks to the file gitk. The "--" is necessary to avoid confusion with the branch named gitk
gitk --max-count=100 --all -- Makefile
Show at most 100 changes made to the file Makefile. Instead of only looking for changes in the current branch look in all branches.
FILES
Gitk creates the .gitk file in your $HOME directory to store preferences such as display options, font, and colors.
SEE ALSO
qgit(1)
A repository browser written in C++ using Qt.
gitview(1)
A repository browser written in Python using Gtk. It's based on bzrk(1) and distributed in the contrib area of the git repository.
tig(1)
A minimal repository browser and git tool output highlighter written in C using Ncurses.
GIT
Part of the git(1) suite
Git 1.7.10.4 11/24/2012 GITK(1)