wiki

This page is read only. You can view the source, but not change it. Ask your administrator if you think this is wrong.
====== Linux replace boot disk ======

===== Move boot disk on PPC64LE linux partition =====

<cli prompt='#'>
[root@lnxtest-101 ~]# cat /etc/redhat-release
Red Hat Enterprise Linux release 8.7 (Ootpa)
[root@lnxtest-101 ~]# uname -a
Linux lnxtest-101.police.etat.lu 4.18.0-425.3.1.el8.ppc64le #1 SMP Fri Sep 30 11:30:21 EDT 2022 ppc64le ppc64le ppc64le GNU/Linux
</cli>

==== Step 1: make a disk snapshot on SVC ====

FIXME In the following procedure, be attentive to the disk name, some commands are disruptive

==== Step 2: add a new disk ====

The disk can be multipath or not
<cli prompt='#'>
[root@lnxtest-101 ~]# multipath -ll
mpathd (360050768018186646800000000000e75) dm-1 IBM,2145
size=40G features='1 queue_if_no_path' hwhandler='1 alua' wp=rw
|-+- policy='service-time 0' prio=50 status=active
| |- 3:0:1:0 sdi 8:128  active ready running
| |- 4:0:1:0 sdm 8:192  active ready running
| |- 1:0:5:0 sdt 65:48  active ready running
| `- 2:0:5:0 sds 65:32  active ready running
`-+- policy='service-time 0' prio=10 status=enabled
  |- 3:0:3:0 sdk 8:160  active ready running
  |- 4:0:3:0 sdo 8:224  active ready running
  |- 2:0:7:0 sdv 65:80  active ready running
  `- 1:0:7:0 sdx 65:112 active ready running
mpathf (SIBM_3303_NVDISKfb563ae0cd77a45523162dc37ff302e1) dm-12 IBM,3303      NVDISK
size=40G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=1 status=active
| `- 5:0:1:0 sdg 8:96   active ready running
`-+- policy='service-time 0' prio=1 status=enabled
  `- 6:0:1:0 sdh 8:112  active ready running
 
[root@lnxtest-101 ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  rootvg   1   7   0 wz--n- 39.00g 25.00g
[root@lnxtest-101 ~]# pvs
  PV                  VG     Fmt  Attr PSize  PFree
  /dev/mapper/mpathd3 rootvg lvm2 a--  39.00g 25.00g
[root@lnxtest-101 ~]# df -h
Filesystem                           Size  Used Avail Use% Mounted on
/dev/mapper/mpathd2                  999M  586M  414M  59% /boot
/dev/mapper/rootvg-usr               3.0G  2.5G  587M  81% /usr
/dev/mapper/rootvg-tmp              1014M   40M  975M   4% /tmp
/dev/mapper/rootvg-var               3.0G  935M  2.1G  31% /var
/dev/mapper/rootvg-home             1014M   40M  975M   4% /home

[root@lnxtest-101 ~]# fdisk -l /dev/mapper/mpathd
Disk /dev/mapper/mpathd: 40 GiB, 42949672960 bytes, 83886080 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 32768 bytes / 32768 bytes
Disklabel type: dos
Disk identifier: 0xdd417826

Device              Boot   Start      End  Sectors  Size Id Type
/dev/mapper/mpathd1 *       2048    22527    20480   10M 41 PPC PReP Boot
/dev/mapper/mpathd2        22528  2080767  2058240 1005M 83 Linux
/dev/mapper/mpathd3      2080768 83886079 81805312   39G 8e Linux LVM
</cli>

==== Step 3: clone partition table on new disk ====

Yum cleanup before starting
<cli prompt='#'>
[root@lnxtest-101 ~]# yum clean all
</cli>
<cli prompt='#'>
[root@lnxtest-101 ~]# multipath -ll | grep mpath
mpathd (360050768018186646800000000000e75) dm-1 IBM,2145
mpathf (SIBM_3303_NVDISKfb563ae0cd77a45523162dc37ff302e1) dm-12 IBM,3303      NVDISK
</cli>

Clone partition table
<cli prompt='#'>
[root@lnxtest-101 ~]# sfdisk -d /dev/mapper/mpathd | sfdisk --force /dev/mapper/mpathf
Checking that no-one is using this disk right now ... FAILED

This disk is currently in use - repartitioning is probably a bad idea.
Umount all file systems, and swapoff all swap partitions on this disk.
Use the --no-reread flag to suppress this check.

Disk /dev/mapper/mpathf: 40 GiB, 42949672960 bytes, 83886080 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes

>>> Script header accepted.
>>> Script header accepted.
>>> Script header accepted.
>>> Script header accepted.
>>> Created a new DOS disklabel with disk identifier 0xdd417826.
/dev/mapper/mpathf-part1: Created a new partition 1 of type 'PPC PReP Boot' and of size 10 MiB.
/dev/mapper/mpathf-part2: Created a new partition 2 of type 'Linux' and of size 1005 MiB.
/dev/mapper/mpathf-part3: Created a new partition 3 of type 'Linux LVM' and of size 39 GiB.
/dev/mapper/mpathf-part4: Done.

New situation:
Disklabel type: dos
Disk identifier: 0xdd417826

Device                   Boot   Start      End  Sectors  Size Id Type
/dev/mapper/mpathf-part1 *       2048    22527    20480   10M 41 PPC PReP Boot
/dev/mapper/mpathf-part2        22528  2080767  2058240 1005M 83 Linux
/dev/mapper/mpathf-part3      2080768 83886079 81805312   39G 8e Linux LVM

The partition table has been altered.
Calling ioctl() to re-read partition table.
Re-reading the partition table failed.: Invalid argument
The kernel still uses the old table. The new table will be used at the next reboot or after you run partprobe(8) or kpartx(8).
Syncing disks.
</cli>

Rescan partitions
<cli prompt='#'>
[root@lnxtest-101 ~]# partprobe -s
</cli>
<cli prompt='#'>
[root@lnxtest-101 ~]# pvcreate /dev/mapper/mpathf3
  Physical volume "/dev/mapper/mpathf3" successfully created.
[root@lnxtest-101 ~]# vgs
  VG     #PV #LV #SN Attr   VSize  VFree
  rootvg   1   7   0 wz--n- 39.00g 25.00g
</cli>

==== Step 4: move LVM to new disk ====

Extend your rootvg
<cli prompt='#'>
[root@lnxtest-101 ~]# vgextend rootvg /dev/mapper/mpathf3
</cli>

Move data from one disk to another
<cli prompt='#'>
[root@lnxtest-101 ~]# pvmove -b /dev/mapper/mpathd3 /dev/mapper/mpathf3
[root@lnxtest-101 ~]# lvs -a -o+devices
  LV          VG     Attr       LSize  Pool Origin Data%  Meta%  Move                Log Cpy%Sync Convert Devices
  besclientlv rootvg -wI-ao----  1.00g                                                                    pvmove0(0)
  home        rootvg -wI-ao----  1.00g                                                                    pvmove0(0)
  [pvmove0]   rootvg p-C-aom--- 14.00g                           /dev/mapper/mpathd3     14.29            /dev/mapper/mpathd3(0),/dev/mapper/mpathf3(0)
  [pvmove0]   rootvg p-C-aom--- 14.00g                           /dev/mapper/mpathd3     14.29            /dev/mapper/mpathd3(512),/dev/mapper/mpathf3(512)
  [pvmove0]   rootvg p-C-aom--- 14.00g                           /dev/mapper/mpathd3     14.29            /dev/mapper/mpathd3(768),/dev/mapper/mpathf3(768)
  [pvmove0]   rootvg p-C-aom--- 14.00g                           /dev/mapper/mpathd3     14.29            /dev/mapper/mpathd3(1024),/dev/mapper/mpathf3(1024)
  [pvmove0]   rootvg p-C-aom--- 14.00g                           /dev/mapper/mpathd3     14.29            /dev/mapper/mpathd3(1792),/dev/mapper/mpathf3(1792)
  [pvmove0]   rootvg p-C-aom--- 14.00g                           /dev/mapper/mpathd3     14.29            /dev/mapper/mpathd3(2560),/dev/mapper/mpathf3(2560)
  [pvmove0]   rootvg p-C-aom--- 14.00g                           /dev/mapper/mpathd3     14.29            /dev/mapper/mpathd3(3328),/dev/mapper/mpathf3(3328)
  root        rootvg -wI-ao----  3.00g                                                                    pvmove0(0)
  swap        rootvg -wI-ao----  2.00g                                                                    pvmove0(0)
  tmp         rootvg -wI-ao----  1.00g                                                                    pvmove0(0)
  usr         rootvg -wI-ao----  3.00g                                                                    pvmove0(0)
  var         rootvg -wI-ao----  3.00g                                                                    pvmove0(0)
</cli>

Check the end of the move process
<cli prompt='#'>  
[root@lnxtest-101 ~]#  vgreduce rootvg /dev/mapper/mpathd3
  Removed "/dev/mapper/mpathd3" from volume group "rootvg"
[root@lnxtest-101 ~]#  pvremove /dev/mapper/mpathd3
</cli>

LVM cleanup
<cli prompt='#'>  
[root@lnxtest-101 ~]#  vgreduce rootvg /dev/mapper/mpathd3
  Removed "/dev/mapper/mpathd3" from volume group "rootvg"
[root@lnxtest-101 ~]#  pvremove /dev/mapper/mpathd3
</cli>

==== Step 5: Copy boot sectors ====

Clone PPC PReP Boot partition:
<cli prompt='#'>
[root@lnxtest-101 ~]# dd if=/dev/mapper/mpathd1 of=/dev/mapper/mpathf1 bs=512 conv=noerror,sync
20480+0 records in
20480+0 records out
10485760 bytes (10 MB, 10 MiB) copied, 0.58557 s, 17.9 MB/s
</cli>

Clone /boot:
<cli prompt='#'>
[root@lnxtest-101 ~]#  umount /boot

[root@lnxtest-101 ~]# multipath -ll | grep mpath
mpathd (360050768018186646800000000000e75) dm-1 IBM,2145
mpathf (SIBM_3303_NVDISKfb563ae0cd77a45523162dc37ff302e1) dm-12 IBM,3303      NVDISK

[root@lnxtest-101 ~]# dd if=/dev/mapper/mpathd2 of=/dev/mapper/mpathf2 bs=512 conv=noerror,sync
2058240+0 records in
2058240+0 records out
1053818880 bytes (1.1 GB, 1005 MiB) copied, 65.658 s, 16.1 MB/s
[root@lnxtest-101 ~]# mount /boot
</cli>

Copy boot sector:
<cli prompt='#'>
[root@lnxtest-101 ~]# dd if=/dev/mapper/mpathd of=/dev/mapper/mpathf bs=1 count=512
512+0 records in
512+0 records out
512 bytes copied, 0.00110371 s, 464 kB/s
</cli>

==== Step 6: Install GRUB in new disk ====

First test on the disk...failed, then on PreP partition:
<cli prompt='#'>
[root@lnxtest-101 ~]# grub2-install /dev/mapper/mpathf
Installing for powerpc-ieee1275 platform.
grub2-install: error: the chosen partition is not a PReP partition.

[root@lnxtest-101 ~]# grub2-install /dev/mapper/mpathf1
Installing for powerpc-ieee1275 platform.
Installation finished. No error reported.
</cli>

Check grub config, here virtual FC in the config
<cli prompt='#'>
[root@lnxtest-101 ~]# cat /boot/grub2/grub.cfg
  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//vdevice/vfc-client@30000006/disk@5005076810078be4,msdos2'  7895f8b3-3eda-4ff3-903f-58d08a3447d4
  search --no-floppy --fs-uuid --set=root 7895f8b3-3eda-4ff3-903f-58d08a3447d4
  search --no-floppy --fs-uuid --set=boot --hint-ieee1275='ieee1275//vdevice/vfc-client@30000006/disk@5005076810078be4,msdos2'  7895f8b3-3eda-4ff3-903f-58d08a3447d4
  search --no-floppy --fs-uuid --set=boot 7895f8b3-3eda-4ff3-903f-58d08a3447d4
</cli>

Rebuild grb config and boot sector
<cli prompt='#'>
[root@lnxtest-101 ~]# dracut --regenerate-all --force
[root@lnxtest-101 ~]# grub2-mkconfig -o /boot/grub2/grub.cfg
Generating grub configuration file ...
Generating boot entries from BLS files...
done
</cli>

Check grub config, now virtual SCSI in the config
<cli prompt='#'>
[root@lnxtest-101 ~]# cat /boot/grub2/grub.cfg | grep flopp
  search --no-floppy --fs-uuid --set=root --hint-ieee1275='ieee1275//vdevice/v-scsi@30000007/disk@8100000000000000,msdos2'  7895f8b3-3eda-4ff3-903f-58d08a3447d4
  search --no-floppy --fs-uuid --set=root 7895f8b3-3eda-4ff3-903f-58d08a3447d4
  search --no-floppy --fs-uuid --set=boot --hint-ieee1275='ieee1275//vdevice/v-scsi@30000007/disk@8100000000000000,msdos2'  7895f8b3-3eda-4ff3-903f-58d08a3447d4
  search --no-floppy --fs-uuid --set=boot 7895f8b3-3eda-4ff3-903f-58d08a3447d4
</cli>

Check grub config, now virtual SCSI in the config
<cli prompt='#'>  
[root@lnxtest-101 ~]# multipath -ll
...
mpathf (SIBM_3303_NVDISKfb563ae0cd77a45523162dc37ff302e1) dm-12 IBM,3303      NVDISK
size=40G features='1 queue_if_no_path' hwhandler='0' wp=rw
|-+- policy='service-time 0' prio=1 status=active
| `- 5:0:1:0 sdg 8:96   active ready running
`-+- policy='service-time 0' prio=1 status=enabled
  `- 6:0:1:0 sdh 8:112  active ready running
</cli>

Set the bootlist and reboot
<cli prompt='#'>
[root@lnxtest-101 ~]# bootlist -m normal sdg sdh
[root@lnxtest-101 ~]# init 6
</cli>
wiki

User Tools

Site Tools

Page Tools
