[SGVLUG] FW: Missing ext2 devices

[Matt Campbell]

From: Matt Campbell 
Sent: Friday, December 04, 2009 8:05 PM
To: 'SGVLUG Discussion List.'
Subject: RE: Missing ext2 devices

 

P.S.  Using /sbin/MAKEDEV made better formed devices, but with no better
results:

# /sbin/MAKEDEV -v sdc

create sdc                            b   8  32 root:disk 640
system_u:object_r:fixed_disk_device_t:s0

create sdc1                           b   8  33 root:disk 640
system_u:object_r:fixed_disk_device_t:s0

create sdc2                           b   8  34 root:disk 640
system_u:object_r:fixed_disk_device_t:s0

create sdc3                           b   8  35 root:disk 640
system_u:object_r:fixed_disk_device_t:s0

create sdc4                           b   8  36 root:disk 640
system_u:object_r:fixed_disk_device_t:s0

create sdc5                           b   8  37 root:disk 640
system_u:object_r:fixed_disk_device_t:s0

# mount -t ext3 /dev/sdc2 sdc2

mount: /dev/sdc2 is not a valid block device

 

Matt

 

-- 

Matthew Campbell | Chief Technical Officer

Imagination Games

3330 Cahuenga Boulevard West, 5th Floor

Los Angeles, CA  90068

323.850.1354 x2026 (O)

818.314.9897 (M)

matt.campbell at imaginationgames.com

www.imaginationgames.com

 

From: Matt Campbell 
Sent: Friday, December 04, 2009 7:38 PM
To: 'SGVLUG Discussion List.'
Subject: Missing ext2 devices

 

Good evening,

 

I have run into an odd problem and am hoping you can help.

- I upgraded my main server from FC8 to FC12 this evening.

- I replaced the boot HD so that I would have a snapshot backup of the old
system in case of problems.

- I installed the new OS on a fresh HD and tried to mount the old partitions
to get at the databases.

- Under F12 the old ext2 partitions don't get created in /dev.

 

# ls /dev/sd*

/dev/sda   /dev/sda2  /dev/sda4  /dev/sdb   /dev/sdb2  /dev/sdb4

/dev/sda1  /dev/sda3  /dev/sda5  /dev/sdb1  /dev/sdb3  /dev/sdc

 

Notice there is a /dev/sdc, but no partition device nodes.  When I look the
partitions are there and appear happy (see the text at the end of this
message).  I can still boot off the old HD so it is working properly.

 

When I just create a new device node it doesn't work properly:

# mknod /dev/sdc2 b 8 34

# mount -t ext2 /dev/sdc2 /mnt/sdc2

mount: /dev/sdc2 is not a valid block device

 

When I try and take a closer look at a partition I get an odd error:

# parted /dev/sdc

  check 3

  checking for bad blocks. 100%

  check 5

  Error: File system has an incompatible feature enabled.  Compatible
features are

has_journal, dir_index, filetype, sparse_super and large_file.  Use tune2fs
or

debugfs to remove features.

 

Googling this error yields a number of solutions, but they all depend on
having a device to act on.

 

Any ideas of how to proceed?

 

Matt

 

root at nala:5# fdisk /dev/sdc

Command (m for help): p

Disk /dev/sdc: 251.0 GB, 251000193024 bytes

255 heads, 63 sectors/track, 30515 cylinders

Units = cylinders of 16065 * 512 = 8225280 bytes

Disk identifier: 0x00070acf

   Device Boot      Start         End      Blocks   Id  System

/dev/sdc1   *           1          25      200781   83  Linux

/dev/sdc2              26        1937    15358140   83  Linux

/dev/sdc3            1938        2574     5116702+  82  Linux swap / Solaris

/dev/sdc4            2575       30515   224436082+   5  Extended

/dev/sdc5            2575       30515   224436051   83  Linux

 

root at nala:6# parted /dev/sdc

GNU Parted 1.9.0

Using /dev/sdc

Welcome to GNU Parted! Type 'help' to view a list of commands.

(parted) p                                                                

Model: ATA Maxtor 6B250S0 (scsi)

Disk /dev/sdc: 251GB

Sector size (logical/physical): 512B/512B

Partition Table: msdos

Number  Start   End     Size    Type      File system     Flags

 1      32.3kB  206MB   206MB   primary   ext2            boot

 2      206MB   15.9GB  15.7GB  primary   ext2

 3      15.9GB  21.2GB  5240MB  primary   linux-swap(v1)  swap

 4      21.2GB  251GB   230GB   extended

 5      21.2GB  251GB   230GB   logical   ext3

 

-- 

Matthew Campbell | Chief Technical Officer

Imagination Games

3330 Cahuenga Boulevard West, 5th Floor

Los Angeles, CA  90068

323.850.1354 x2026 (O)

818.314.9897 (M)

matt.campbell at imaginationgames.com

www.imaginationgames.com

 

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