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centos.org
Mar 15, 2023
b3f0896 · Mar 15, 2023

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centos.org

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oleg@guixsd ~$ ssh [email protected] Warning: Permanently added ‘192.168.154.64’ (ED25519) to the list of known hosts. Last login: Thu Feb 10 13:07:08 2022 from gateway [root@localhost ~]# [root@localhost ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT vda 252:0 0 20G 0 disk ├─vda1 252:1 0 200M 0 part /boot/efi ├─vda2 252:2 0 1G 0 part /boot └─vda3 252:3 0 18.8G 0 part ├─centos-pool00_tmeta 253:0 0 8M 0 lvm │ └─centos-pool00-tpool 253:2 0 13G 0 lvm │ ├─centos-root 253:3 0 13G 0 lvm / │ └─centos-pool00 253:5 0 13G 1 lvm ├─centos-pool00_tdata 253:1 0 13G 0 lvm │ └─centos-pool00-tpool 253:2 0 13G 0 lvm │ ├─centos-root 253:3 0 13G 0 lvm / │ └─centos-pool00 253:5 0 13G 1 lvm └─centos-swap 253:4 0 2G 0 lvm [SWAP] [root@localhost ~]# pvdisplay — Physical volume — PV Name /dev/vda3 VG Name centos PV Size 18.80 GiB / not usable 2.00 MiB Allocatable yes PE Size 4.00 MiB Total PE 4813 Free PE 963 Allocated PE 3850 PV UUID R3GjcU-APAf-3dwl-6qpN-DlDA-gmSf-KVelJ5

[root@localhost ~]# vgdisplay — Volume group — VG Name centos System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 7 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 2 Max PV 0 Cur PV 1 Act PV 1 VG Size 18.80 GiB PE Size 4.00 MiB Total PE 4813 Alloc PE / Size 3850 / <15.04 GiB Free PE / Size 963 / 3.76 GiB VG UUID tmYsRa-EbFi-uato-AbPO-SNXJ-WVTV-14tv4z

[root@localhost ~]# lvdisplay — Logical volume — LV Name pool00 VG Name centos LV UUID 1a9gsN-3G7l-KPXr-Pzif-Ga3r-f5XQ-ebZmZM LV Write Access read/write (activated read only) LV Creation host, time localhost, 2022-02-10 12:59:24 +0300 LV Pool metadata pool00_tmeta LV Pool data pool00_tdata LV Status available

LV Size 13.02 GiB Allocated pool data 12.14% Allocated metadata 20.65% Current LE 3334 Segments 1 Allocation inherit Read ahead sectors auto

  • currently set to 8192

Block device 253:2

— Logical volume — LV Path /dev/centos/root LV Name root VG Name centos LV UUID wDmyh4-7rNQ-8nqr-OKSx-tXP4-fA4z-n80jv6 LV Write Access read/write LV Creation host, time localhost, 2022-02-10 12:59:25 +0300 LV Pool name pool00 LV Status available

LV Size 13.02 GiB Mapped size 12.14% Current LE 3334 Segments 1 Allocation inherit Read ahead sectors auto

  • currently set to 8192

Block device 253:3

— Logical volume — LV Path /dev/centos/swap LV Name swap VG Name centos LV UUID 3bc09M-9tXU-M47P-oCAq-VZp2-jH3F-sxro7Q LV Write Access read/write LV Creation host, time localhost, 2022-02-10 12:59:25 +0300 LV Status available

LV Size 2.00 GiB Current LE 512 Segments 1 Allocation inherit Read ahead sectors auto

  • currently set to 8192

Block device 253:4

Fix GRUB

Centos 6

Centos 7 could be booted via network (netboot.xyz) or ISO file.

Mount Centos 6 filesystem to /mnt, then:

mount --rbind /dev /mnt/dev
mount -t proc /proc /mnt/proc
mount --rbind /sys /mnt/sys

Then run grub-install /dev/DEVICE, e.g.:

grub-install /dev/md127

if you get error about extra disk (e.g. /dev/vda while your RAID consists only from /dev/sda1 and /dev/sdb1) in software raid you could work around it with a symlink:

ln -s /dev/md127 /dev/vda

Then try to invoke grub-install /dev/md127 again.