Contents
- 1 Preamble
- 2 Prerequisites
- 3 LVM
- 4 Boot
- 5 Conclusion
Preamble
This document is directed to give idea how to create mirroring of root filesystem in Solaris x86 with the help of Solaris Volume Manager. Here will be used already installed OS and all the work will be done without need of reinstall
Prerequisites
1. First we should be sure have two identical harddisks in the server
# format Searching for disks...done AVAILABLE DISK SELECTIONS: 0. c0d0 <DEFAULT cyl 1563 alt 2 hd 255 sec 63> /pci@0,0/pci-ide@7,1/ide@0/cmdk@0,0 1. c0d1 <DEFAULT cyl 1563 alt 2 hd 255 sec 63> /pci@0,0/pci-ide@7,1/ide@0/cmdk@1,0 Specify disk (enter its number): ^C
2. Its need to create small slice for metadb information (usually slice 7) like:
partition> p Current partition table (unnamed): Total disk cylinders available: 1563 + 2 (reserved cylinders) Part Tag Flag Cylinders Size Blocks 0 root wm 518 - 1562 8.01GB (1045/0/0) 16787925 1 swap wu 3 - 133 1.00GB (131/0/0) 2104515 2 backup wm 0 - 1562 11.97GB (1563/0/0) 25109595 3 unassigned wm 0 0 (0/0/0) 0 4 unassigned wm 0 0 (0/0/0) 0 5 unassigned wm 0 0 (0/0/0) 0 6 unassigned wm 0 0 (0/0/0) 0 7 unassigned wm 134 - 135 15.69MB (2/0/0) 32130 8 boot wu 0 - 0 7.84MB (1/0/0) 16065 9 alternates wu 1 - 2 15.69MB (2/0/0) 32130
3. Next step is to create the same partitions on the second disk. To avoid human error it is much better to use some kind of automations:
prtvtoc /dev/rdsk/c0d0s2 > /tmp/c0d0s2.toc fmthard -s /tmp/c0d0s2.toc /dev/rdsk/c0d1s2
4. Then we should identify the partitions need to be mirrored:
# egrep "ufs|swap" /etc/vfstab|grep "/dev/dsk" /dev/dsk/c0d0s1 - - swap - no - /dev/dsk/c0d0s0 /dev/rdsk/c0d0s0 / ufs 1 no -
LVM
1. Let’s create few copies of metadb on the partitions we create for this puspose:
# metadb -a -f -c 2 c0d0s7 c0d1s7
2. It’s time to put our disks where OS reside under management of SVM
# metainit -f d10 1 1 c0d0s0 d10: Concat/Stripe is setup # metainit -f d11 1 1 c0d0s1 d11: Concat/Stripe is setup # metainit d0 -m d10 d0: Mirror is setup # metainit d1 -m d11 d1: Mirror is setup # metaroot d0
3. Check newly created devices:
# ls -l /dev/md/rdsk total 8 lrwxrwxrwx 1 root root 36 Aug 30 18:29 d0 -> ../../../devices/pseudo/md@0:0,0,raw lrwxrwxrwx 1 root root 36 Aug 30 18:29 d1 -> ../../../devices/pseudo/md@0:0,1,raw lrwxrwxrwx 1 root root 37 Aug 30 18:28 d10 -> ../../../devices/pseudo/md@0:0,10,raw lrwxrwxrwx 1 root root 37 Aug 30 18:28 d11 -> ../../../devices/pseudo/md@0:0,11,raw # ls -l /dev/md/dsk total 8 lrwxrwxrwx 1 root root 36 Aug 30 18:29 d0 -> ../../../devices/pseudo/md@0:0,0,blk lrwxrwxrwx 1 root root 36 Aug 30 18:29 d1 -> ../../../devices/pseudo/md@0:0,1,blk lrwxrwxrwx 1 root root 37 Aug 30 18:28 d10 -> ../../../devices/pseudo/md@0:0,10,blk lrwxrwxrwx 1 root root 37 Aug 30 18:28 d11 -> ../../../devices/pseudo/md@0:0,11,blk
4. Make appropriate changes in /etc/vfstab to get boot from mirror, not standard disks
# egrep "ufs|swap" /etc/vfstab|grep "/dev/md/dsk" /dev/md/dsk/d1 - - swap - no - /dev/md/dsk/d0 /dev/md/rdsk/d0 / ufs 1 no -
5. The next step is to flush cache buffers and reboot
# sync;sync;sync # reboot
6. It is time to put second disk under management of SVN
# metainit -f d20 1 1 c0d1s0 d20: Concat/Stripe is setup # metainit -f d21 1 1 c0d1s1 d21: Concat/Stripe is setup
7. And to add them to created previously mirrors. Be aware process of synchronisation will continue in background and you can check the process
# metattach d0 d20 d0: submirror d20 is attached # metattach d1 d21 d1: submirror d21 is attached
8. Check the process of building mirrors and wait till they finnish
# metastat d1: Mirror Submirror 0: d11 State: Okay Submirror 1: d21 State: Resyncing Resync in progress: 96 % done Pass: 1 Read option: roundrobin (default) Write option: parallel (default) Size: 2104515 blocks (1.0 GB) d11: Submirror of d1 State: Okay Size: 2104515 blocks (1.0 GB) Stripe 0: Device Start Block Dbase State Reloc Hot Spare c0d0s1 0 No Okay Yes d21: Submirror of d1 State: Resyncing Size: 2104515 blocks (1.0 GB) Stripe 0: Device Start Block Dbase State Reloc Hot Spare c0d1s1 0 No Okay Yes d0: Mirror Submirror 0: d10 State: Okay Submirror 1: d20 State: Resyncing Resync in progress: 13 % done Pass: 1 Read option: roundrobin (default) Write option: parallel (default) Size: 16787925 blocks (8.0 GB) d10: Submirror of d0 State: Okay Size: 16787925 blocks (8.0 GB) Stripe 0: Device Start Block Dbase State Reloc Hot Spare c0d0s0 0 No Okay Yes d20: Submirror of d0 State: Resyncing Size: 16787925 blocks (8.0 GB) Stripe 0: Device Start Block Dbase State Reloc Hot Spare c0d1s0 0 No Okay Yes Device Relocation Information: Device Reloc Device ID c0d1 Yes id1,cmdk@AVMware_Virtual_IDE_Hard_Drive=01000000000000000001 c0d0 Yes id1,cmdk@AVMware_Virtual_IDE_Hard_Drive=00000000000000000001
Boot
1. Next step is to check if partition on second disk is active
# fdisk /dev/rdsk/c0d1p0 Total disk size is 1566 cylinders Cylinder size is 16065 (512 byte) blocks Cylinders Partition Status Type Start End Length % ========= ====== ============ ===== === ====== === 1 Active Solaris2 1 1565 1565 100 SELECT ONE OF THE FOLLOWING: 1. Create a partition 2. Specify the active partition 3. Delete a partition 4. Change between Solaris and Solaris2 Partition IDs 5. Exit (update disk configuration and exit) 6. Cancel (exit without updating disk configuration) Enter Selection: 5
2. And to add boot record to the second disk to make it bootable
# /sbin/installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c0d1s0 stage1 written to partition 0 sector 0 (abs 16065) stage2 written to partition 0, 233 sectors starting at 50 (abs 16115)
3. Add new item in the boot menu (/boot/grub/menu.lst) to have alternative way to boot
title Alternate boot root (hd1,0,a) kernel /platform/i86pc/multiboot module /platform/i86pc/boot_archive
4. Check if the new item is added to the boot menu
# bootadm list-menu The location for the active GRUB menu is: /boot/grub/menu.lst default 0 timeout 10 0 Solaris 10 5/08 s10x_u5wos_10 X86 1 Solaris failsafe 2 Alternate boot
5. That’s all, you have already mirrored root partition (plus swap)
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