Hello Guys,

I've a RHEL4U4 Server having 2xMSA1500 controller with 2xMSA20(500x11 HDD).
configured as ARRAY A and ARRAY B for both controllers

each Array does have 20 Logical volumes and are mirrored
My problem is 4 partitions that is , md15, md16, md18 and md19 is having some problem and not mounting, here is some o/p:-

/bin/uname -a
Linux Server-1 2.6.9-42.ELsmp #1 SMP Wed Jul 12 23:27:17 EDT 2006 i686 i686 i386 GNU/Linux

/bin/mount
/dev/cciss/c0d0p2 on / type ext3 (rw)
none on /proc type proc (rw)
none on /sys type sysfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
usbfs on /proc/bus/usb type usbfs (rw)
/dev/cciss/c0d0p1 on /boot type ext3 (rw)
none on /dev/shm type tmpfs (rw)
/dev/cciss/c0d0p9 on /home type ext3 (rw)
/dev/cciss/c0d0p8 on /tmp type ext3 (rw)
/dev/cciss/c0d0p7 on /usr type ext3 (rw)
/dev/cciss/c0d0p5 on /usr/local type ext3 (rw)
/dev/cciss/c0d0p6 on /var type ext3 (rw)
/dev/mapper/vg0-lv0 on /dbdata1 type ext3 (rw)
/dev/mapper/vg1-lv1 on /dbdata2 type ext3 (rw)
/dev/mapper/vg2-lv2 on /imagedata1 type ext3 (rw)
/dev/mapper/vg3-lv3 on /imagedata2 type ext3 (rw)
/dev/mapper/vg4-lv4 on /imagedata3 type ext3 (rw)
/dev/mapper/vg5-lv5 on /imagedata4 type ext3 (rw)
/dev/mapper/vg6-lv6 on /imagedata5 type ext3 (rw)
/dev/mapper/vg7-lv7 on /imagedata6 type ext3 (rw)
/dev/mapper/vg8-lv8 on /imagedata7 type ext3 (rw)
/dev/mapper/vg9-lv9 on /imagedata8 type ext3 (rw)
/dev/mapper/vg10-lv10 on /imagedata9 type ext3 (rw)
/dev/mapper/vg11-lv11 on /imagedata10 type ext3 (rw)
/dev/mapper/vg12-lv12 on /imagedata11 type ext3 (rw)
/dev/mapper/vg13-lv13 on /imagedata12 type ext3 (rw)
/dev/mapper/vg14-lv14 on /imagedata13 type ext3 (rw)
/dev/mapper/vg17-lv17 on /imagedata16 type ext3 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
nfsd on /proc/fs/nfsd type nfsd (rw)


Personalities : [raid1]
md1 : active raid1 sdb1[0]
460800320 blocks [2/1] [U_]

md2 : active raid1 sdc1[0]
511999424 blocks [2/1] [U_]

md3 : active raid1 sdd1[0]
511999424 blocks [2/1] [U_]

md4 : active raid1 sde1[0]
511999424 blocks [2/1] [U_]

md5 : active raid1 sdf1[0]
511999424 blocks [2/1] [U_]

md6 : active raid1 sdg1[0]
511999424 blocks [2/1] [U_]

md7 : active raid1 sdh1[0]
511999424 blocks [2/1] [U_]

md8 : active raid1 sdi1[0]
511999424 blocks [2/1] [U_]

md9 : active raid1 sdj1[0]
511999424 blocks [2/1] [U_]

md10 : active raid1 sdk1[0]
511999424 blocks [2/1] [U_]

md11 : active raid1 sdl1[0]
511999424 blocks [2/1] [U_]

md12 : active raid1 sdag1[1] sdm1[0]
511999424 blocks [2/2] [UU]

md13 : active raid1 sdn1[0]
511999424 blocks [2/1] [U_]

md14 : active raid1 sdo1[0]
511999424 blocks [2/1] [U_]

md15 : active raid1 sdaj1[1] sdp1[0]
511999424 blocks [2/2] [UU]

md16 : active raid1 sdak1[1]
511999424 blocks [2/1] [_U]

md17 : active raid1 sdr1[0]
511999424 blocks [2/1] [U_]

md18 : active raid1 sdam1[1]
511999424 blocks [2/1] [_U]

md19 : active raid1 sdan1[1]
511999424 blocks [2/1] [_U]

md0 : active raid1 sdu1[2] sda1[0]
460800320 blocks [2/2] [UU]

unused devices: <none>

Filesystems

nodev sysfs
nodev rootfs
nodev bdev
nodev proc
nodev sockfs
nodev binfmt_misc
nodev usbfs
nodev usbdevfs
nodev futexfs
nodev tmpfs
nodev pipefs
nodev eventpollfs
nodev devpts
ext2
nodev ramfs
nodev hugetlbfs
iso9660
nodev relayfs
nodev mqueue
nodev selinuxfs
ext3
nodev rpc_pipefs
nodev autofs
nodev nfsd
vfat


When I'm trying to Mount the device is shows something like this

root@10.32.190.5's password:
Last login: Fri Mar 8 12:40:05 2013 from 10.17.62.250
[root@Server-1 ~]# mount /dev/vg15/lv15 /imagedata14/
mount: you must specify the filesystem type
[root@Server-1 ~]# mount -t ext3 /dev/vg15/lv15 /imagedata14/
mount: wrong fs type, bad option, bad superblock on /dev/vg15/lv15,
or too many mounted file systems
[root@Server-1 ~]# mdadm -S /dev/md15
mdadm: fail to stop array /dev/md15: Device or resource busy


tail dmesg shows

EXT3-fs: group descriptors corrupted !
SELinux: initialized (dev ramfs, type ramfs), uses genfs_contexts
NET: Registered protocol family 10
Disabled Privacy Extensions on device c0344160(lo)
IPv6 over IPv4 tunneling driver
divert: not allocating divert_blk for non-ethernet device sit0
mtrr: type mismatch for f0000000,2000000 old: uncachable new: write-combining
drivers/usb/input/hid-input.c: event field not found
Adding 16779884k swap on /dev/cciss/c0d0p3. Priority:-1 extents:1
SELinux: initialized (dev binfmt_misc, type binfmt_misc), uses genfs_contexts

mdadm --detail /dev/md15
/dev/md15:
Version : 00.90.01
Creation Time : Sat May 24 01:33:04 2008
Raid Level : raid1
Array Size : 511999424 (488.28 GiB 524.29 GB)
Device Size : 511999424 (488.28 GiB 524.29 GB)
Raid Devices : 2
Total Devices : 2
Preferred Minor : 15
Persistence : Superblock is persistent

Update Time : Thu Mar 7 15:40:29 2013
State : clean
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0


Number Major Minor RaidDevice State
0 8 241 0 active sync /dev/sdp1
1 66 49 1 active sync /dev/sdaj1
UUID : d7c2090f:3fed34ed:bdf89c12:a3bad17d
Events : 0.1006049

mdadm --examine /dev/md15
mdadm: No super block found on /dev/md15 (Expected magic a92b4efc, got 00000000)

Please help me to get rid of the problem

My first concern looking at the above information is that almost all of your arrays are degraded. Everything but md0, md12 and md15 are missing disks. Secondly the dmesg output appears to be saying your file system is corrupted. I cannot be sure of that but it seems likely. Have you checked SMART status of the physical drives to be sure they are not in a failing state?

If this dropped into my lap the first thing I would do is backup the data and start checking those drives for failures. Second thing would be to run an fsck on the drives that cannot mount.

I hope this gets you started.