UnixServerAdmin

Server Administration & Management

POST Error 1962: No operating system found will reboot in 1 sec

After installing VMWare ESXi and rebooting the system, the user experiences the following POST error “Error 1962 No operating system found will reboot in 1 sec?” in Lenovo ThinkCenter (M62z, M72e, M72e Tiny, M72z, M78, M82, M83, M92, M92p, M92p Tiny, M92z, M93, M93p, M93p Tiny, M93z, Edge 62z, Edge 72z, Edge 92, Edge 92z, E93) and Lenovo ThinkStation E31

To resolve this issue, the user should follow the steps as following :-

1. Press F1 during POST to enter the BIOS Setup screen.
2. Go to the EXIT tab and change “OS optimal defaults” to “Disabled”.
3. Go to the STARTUP tab and change “Boot Mode” to “Legacy” (the default setting is AUTO).
4. Save changes and exit the BIOS.  (NOTE:  User may use the F10 keystroke).

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January 30, 2014 Posted by | Tips & Tricks, Unix/Linux | , | 1 Comment

Software RAID issue after reboot of OS

After successful installation of OS, if there are some problem to boot os in one Hard-drive, as grub issue like kernel panic or grub error 17 or other issue

1. Reboot the machine in Rescue mode

Boot: linux rescue

# chroot /mnt/sysimages
OR
# mkdir /a
# mount /dev/sdaX /a
# cd /a

# cat /proc/mdstat (UU means both disk are live)

2. Run the following commands to hotadd and rebuild the array

# mdadm /dev/md0 –add /dev/sda1
# mdadm /dev/md1 –add /dev/sda2
# mdadm /dev/md2 –add /dev/sda3

# grub-install /dev/md0    OR

# grub (GRUB shell type above command to reinstall the boot loader on both drives & reboot.)

grub> device (hd0) /dev/sda
grub> root (hd0,0)
grub> setup (hd0)

grub> device (hd1) /dev/sdb
grub> root (hd1,0)
grub> setup (hd1)

grub> quit

This is show on /boot/grub/device.map

grub> find /grub/stage1 (Find out which are the hard disks on which you can install grub)

This file show in /boot/grub/device.map

grub> device (hd0) /dev/sda
grub> root (hd0,0)
grub> setup (hd0)

January 20, 2014 Posted by | RAID, Tips & Tricks, Unix/Linux | , , , | Leave a comment

How to Check or Monitoring Software RAID in Linux

# mdadm

# cat /proc/mdstat

# mdadm –detail /dev/md0 OR /dev/md1

# mdadm -E /dev/md0 (Spare rebuilding means sync & recovery data to each drive to other)

# mdadm -R /dev/md1 (Recovery & transfer in speed 20-40 Mbps depend on CPU & Hard-drive)

# mdadm /dev/md0 -add /dev/sdb1 [Add partition (RAID Device) /dev/sdb1 into /dev/md0]

January 10, 2014 Posted by | RAID, Tips & Tricks, Unix/Linux | , , , | Leave a comment