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Full Discussion: File System Error: BAD SUPERBLOCK AT BLOCK 16: NUMBER OF DIRECTORIES OUT OF RANGE
Operating Systems Solaris File System Error: BAD SUPERBLOCK AT BLOCK 16: NUMBER OF DIRECTORIES OUT OF RANGE Post 302943813 by Buddhike G on Wednesday 13th of May 2015 04:57:35 AM
Old 05-13-2015
File System Error: BAD SUPERBLOCK AT BLOCK 16: NUMBER OF DIRECTORIES OUT OF RANGE
Hi All,
we are having a file system error in one of our servers. The server failed to boot in usual user mode. Instead boot with single user mode and requesting to run a FSCK manually to repair the corrupted. see the below output.


Code:
Netra T2000, No Keyboard
Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
OpenBoot 4.28.9, 8064 MB memory available, Serial #9dddddddae.
.
 
 
 
 
 
 
Boot device: /pci@780/pci@0/pci@9/scsi@0/disk@1,0:a  File and args:
SunOS Release 5.10 Version Generic_142900-03 64-bit
Copyright 1983-2009 Sun Microsystems, Inc.  All rights reserved.
Use is subject to license terms.
Hostname: SVR
The / file system (/dev/md/rdsk/d0) is being checked.
 
 
WARNING - Unable to repair the / filesystem. Run fsck
manually (fsck -F ufs /dev/md/rdsk/d0).
 
 
May 12 17:21:42 svc.startd[7]: svc:/system/filesystem/usr:default: Method "/lib/svc/method/fs-usr" failed with exit status 95.
May 12 17:21:42 svc.startd[7]: system/filesystem/usr:default failed fatally: transitioned to maintenance (see 'svcs -xv' for details)
Requesting System Maintenance Mode
(See /lib/svc/share/README for more information.)
Console login service(s) cannot run
 
 
Root password for system maintenance (control-d to bypass):
single-user privilege assigned to /dev/console.
Entering System Maintenance Mode
 
 
May 12 17:21:47 su: 'su root' succeeded for root on /dev/console
Sun Microsystems Inc.   SunOS 5.10      Generic January 2005
You have new mail.
Sourcing //.profile-EIS.....
root@SVR #
root@SVR #
root@SVR # fsck -F ufs /dev/md/rdsk/d0
** /dev/md/rdsk/d0
BAD SUPERBLOCK AT BLOCK 16: NUMBER OF DIRECTORIES OUT OF RANGE
 
 
LOOK FOR ALTERNATE SUPERBLOCKS WITH MKFS?
 
 
 
 
LOOK FOR ALTERNATE SUPERBLOCKS WITH NEWFS? Y
 
 
FOUND ALTERNATE SUPERBLOCK 32 WITH NEWFS
 
 
USE ALTERNATE SUPERBLOCK? y
 
 
FOUND ALTERNATE SUPERBLOCK AT 32 USING NEWFS
If filesystem was created with manually-specified geometry, using
auto-discovered superblock may result in irrecoverable damage to
filesystem and user data.
 
 
CANCEL FILESYSTEM CHECK? y
 
 
Please verify that the indicated block contains a proper
superblock for the filesystem (see fsdb(1M)).
root@SVR #



When we try to run the fsck it prompts to look for the superblocks using either MKFS or NEWFS, According to the oracle documentation, we need to select it correctly depending on the system. But we do not know from which command the file system is created. so with the warning given, we want get an advise on the best possible way to proceed for the file system repair.

Kindly advise on best possible way to proceed.


Thank You
Buddhike G
 

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LEARN ABOUT FREEBSD

boot.config

BOOT.CONFIG(5)						      BSD File Formats Manual						    BOOT.CONFIG(5)

NAME

     boot.config -- Configuration file for the boot blocks

DESCRIPTION

     The boot.config file contains options for the FreeBSD boot block code.

     When the FreeBSD boot loader runs, it searches the ``a'' slice of the boot partition for a boot.config file (as a result, slices which are
     missing an ``a'' partition require user intervention during the boot process).  If the boot.config file is found, its contents are used as
     the default configuration options for the boot block code and are echoed to the system console.

     A valid format of this file is to put BIOS drive number, a controller type, a unit number, a partition, a kernel file name, and any other
     valid boot(8) option on a single line, as it is done at the ``boot:'' prompt.

     The options related to the boot image selection described below and all the other options available for boot.config are documented in detail
     in the boot(8) manual page.

FILES

     /boot.config  parameters for the boot blocks (optional)

EXAMPLES

     The command:

	   # echo "-P" > /boot.config

     will activate the serial console of FreeBSD.

     The command:

	   # echo "1:ad(1,a)/boot/loader" > /boot.config

     will instruct the second stage of boot(8) on the first disk to boot with the third boot(8) stage from the second disk.

     The command:

	   # echo "1:ad(1,a)/boot/loader -P" > /boot.config

     will do both of the above.

SEE ALSO

     boot(8), loader(8)

AUTHORS

     This manual page was written by Daniel Gerzo <danger@FreeBSD.org>.

BSD
								   May 13, 2007 							       BSD
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