====== GPT disks and parted / gdisk ======
Just notes.
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 931.5G 0 disk
├─sda1 8:1 0 1M 0 part
└─sda2 8:2 0 60G 0 part
└─md0 9:0 0 60G 0 raid1 /
sdb 8:16 0 931.5G 0 disk
└─sdb1 8:17 0 60G 0 part
└─md0 9:0 0 60G 0 raid1 /
# blkid /dev/sda
/dev/sda: PTUUID="e068d9e9-f2c3-4cfd-8927-17971d94bcae" PTTYPE="gpt"
# blkid /dev/sdb
/dev/sdb: PTUUID="7d3e7e2c-6b19-4d5c-a75b-8afec60cb1ec" PTTYPE="gpt"
# parted -a optimal /dev/sda set 3 swap on
Information: You may need to update /etc/fstab.
# parted -a optimal /dev/sda set 4 raid on
Information: You may need to update /etc/fstab.
# parted -a optimal /dev/sda print
Model: ATA CT1000BX500SSD1 (scsi)
Disk /dev/sda: 1000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
Number Start End Size File system Name Flags
1 1049kB 2097kB 1049kB bios_grub
2 2097kB 64.4GB 64.4GB
3 64.4GB 75.2GB 10.7GB Linux filesystem swap
4 75.2GB 1000GB 925GB Linux filesystem raid
Create RAID 1
# mdadm --examine /dev/sda2
/dev/sda2:
Magic : a92b4efc
Version : 1.2
Feature Map : 0x0
Array UUID : fe810c00:7f2f7925:faeaef92:d18128b5
Name : ubuntu-server:0
Creation Time : Thu Jan 13 00:09:33 2022
Raid Level : raid1
Raid Devices : 2
Avail Dev Size : 125761536 (59.97 GiB 64.39 GB)
Array Size : 62880768 (59.97 GiB 64.39 GB)
Data Offset : 67584 sectors
Super Offset : 8 sectors
Unused Space : before=67432 sectors, after=0 sectors
State : clean
Device UUID : 1deddf30:0d781840:e6ee3fdc:021fc5c9
# mdadm --create /dev/md1 --level=mirror --raid-devices=2 /dev/sda4 /dev/sdb4
mdadm: Note: this array has metadata at the start and
may not be suitable as a boot device. If you plan to
store '/boot' on this device please ensure that
your boot-loader understands md/v1.x metadata, or use
--metadata=0.90
Continue creating array? y
mdadm: Defaulting to version 1.2 metadata
mdadm: array /dev/md1 started.
# cat /proc/mdstat
Personalities : [raid1] [linear] [multipath] [raid0] [raid6] [raid5] [raid4] [raid10]
md1 : active raid1 sdb4[1] sda4[0]
903228096 blocks super 1.2 [2/2] [UU]
[>....................] resync = 0.2% (2007296/903228096) finish=74.8min speed=200729K/sec
bitmap: 7/7 pages [28KB], 65536KB chunk
md0 : active raid1 sdb1[1] sda2[0]
62880768 blocks super 1.2 [2/2] [UU]
unused devices:
#
# watch mdadm --detail /dev/md1
Every 2.0s: mdadm --detail /dev/md1
/dev/md1:
Version : 1.2
Creation Time : Thu Jan 13 10:59:46 2022
Raid Level : raid1
Array Size : 903228096 (861.39 GiB 924.91 GB)
Used Dev Size : 903228096 (861.39 GiB 924.91 GB)
Raid Devices : 2
Total Devices : 2
Persistence : Superblock is persistent
Intent Bitmap : Internal
Update Time : Thu Jan 13 11:59:57 2022
State : clean, resyncing
Active Devices : 2
Working Devices : 2
Failed Devices : 0
Spare Devices : 0
Consistency Policy : bitmap
Resync Status : 39% complete
Name : vm1:1 (local to host vm1)
UUID : 5c82e79f:7afd7a4a:37f01db3:1c245334
Events : 731
Number Major Minor RaidDevice State
0 8 4 0 active sync /dev/sda4
1 8 20 1 active sync /dev/sdb4