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#1 2015-11-03 18:04:04
- lsas
- Member
- Registered: 2010-11-23
- Posts: 23
BIOS/GPT and RAID1
Hello everyone.
Here my scenario: I've a HP Microserver G8 with 2 3TB Sata Drive.
Unfortunately the Microserver dont have UEFI but the old BIOS.
After some search i've understood that it's possible to create a mixed BIOS/GPT partitioning scheme.
So i'd like to create a RAID1 BIOS/GPT on the two drives.
I've already read the archwiki but now i'm a bit confused on how to manage the RAID partition, it's my first expirience with it.
I've created created 4 partition on the first disk following the archwiki guide:
/dev/sda1 1M Bios boot
/dev/sda2 512M EFI System
/dev/sda3 50G Linux filesystem
/dev/sda4 2.7T Linux filesystem
The goal is to use sda3 as Archlinux root, and sda4 as data storage partition
Now i cant understand how to procede with RAID, should i change partition type to FD00 only for sda3 and sda4?
I think i'm missing something..
Could you help me to understand?
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#2 2015-11-03 18:46:30
- frostschutz
- Member
- Registered: 2013-11-15
- Posts: 1,499
Re: BIOS/GPT and RAID1
There is no "EFI System" if your mainboard does not support UEFI. It's a regular /boot partition. You should also set the boot flag for the MBR, as some BIOS only machines require it.
With parted it looks like thus:
(parted) mklabel gpt
(parted) disk_set pmbr_boot on
(parted) mkpart grub 64s 2047s
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? Ignore
(parted) set 1 bios_grub on
(parted) unit mib
(parted) mkpart boot 1 512
(parted) mkpart swap 512 1024
(parted) mkpart root 1024 100%
(parted) print free
Model: Loopback device (loopback)
Disk /dev/loop0: 10240MiB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags: pmbr_boot
Number Start End Size File system Name Flags
0.02MiB 0.03MiB 0.01MiB Free Space
1 0.03MiB 1.00MiB 0.97MiB grub bios_grub
2 1.00MiB 512MiB 511MiB boot
3 512MiB 1024MiB 512MiB swap
4 1024MiB 10239MiB 9215MiB root
10239MiB 10240MiB 0.98MiB Free SpaceThen you can proceed to create RAID partitions and filesystems. If you want to support stupid bootloaders, use 1.0 metadata and ext2 for the boot partition.
Partition type fd00 is not required. (It would be for 0.90 metadata and raid autodetect but please for the love of god don't do that anymore)
The partition type matters only if you're dual boot with windows. By default windows would try to format those partitions if not set to a linux specific type (I just set lvm on everything regardless whether I'm actually using it for lvm).
PS: Of course you can also use 1MiB-2MiB for the bios grub partition. However only a few kilobytes are actually used (the grub2 manual mentions 31kb) so I prefer to squeeze it in before the 1st MiB.
Last edited by frostschutz (2015-11-03 18:51:09)
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#3 2015-11-04 10:56:39
- lsas
- Member
- Registered: 2010-11-23
- Posts: 23
Re: BIOS/GPT and RAID1
There is no "EFI System" if your mainboard does not support UEFI. It's a regular /boot partition. You should also set the boot flag for the MBR, as some BIOS only machines require it.
Ok.
If you want to support stupid bootloaders, use 1.0 metadata and ext2 for the boot partition
What do you mean? I will install GRUB2
So for the RAID i should set root and storage partition just to LVM 8e00 ? But LVM and RAID are two different thing as far as i understand. Is that right?
Or i just have to create the filesistem's partitions and the create the array with mdadm ?
PS. meanwhile i'm try to learn something more about raid at https://raid.wiki.kernel.org , but i'm still confused..
Last edited by lsas (2015-11-04 11:14:06)
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#4 2015-11-09 14:21:54
- lsas
- Member
- Registered: 2010-11-23
- Posts: 23
Re: BIOS/GPT and RAID1
After reading the wiki and some other guides (this archwiki was helpfull) i've decided to implement lvm over RAID1.
So first i created the Bios GRUB partition and a big second one:
Dispositivo Start End Sectors Size Type
/dev/sda1 64 2047 1984 992K BIOS boot
/dev/sda2 2048 5860155391 5860153344 2,7T Linuxand then copied the partition table to sdb.
after that i created an array with mdadm of sda2 and sdb2 RAID1.
Then, on top of RAID i've created the lvm device, splitted in four logical volume as follow:
# lvdisplay
--- Logical volume ---
LV Path /dev/server/boot
LV Name boot
VG Name server
LV UUID 3Z70U8-Mc1W-aKQU-tORg-oiaT-P2kI-aYG74K
LV Write Access read/write
LV Creation host, time archiso, 2015-11-06 08:51:19 +0100
LV Status available
# open 1
LV Size 512,00 MiB
Current LE 128
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:0
--- Logical volume ---
LV Path /dev/server/swap
LV Name swap
VG Name server
LV UUID z8PdBc-DZRL-zsC5-190M-nyUl-k3cn-9gaYRo
LV Write Access read/write
LV Creation host, time archiso, 2015-11-06 08:51:28 +0100
LV Status available
# open 2
LV Size 4,00 GiB
Current LE 1024
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:1
--- Logical volume ---
LV Path /dev/server/archroot
LV Name archroot
VG Name server
LV UUID Z2eotR-N0HN-nroI-3hUd-odMB-GzHy-4PrsnL
LV Write Access read/write
LV Creation host, time archiso, 2015-11-06 08:52:37 +0100
LV Status available
# open 1
LV Size 20,00 GiB
Current LE 5120
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:2
--- Logical volume ---
LV Path /dev/server/storage
LV Name storage
VG Name server
LV UUID cccOsD-GBXu-pMws-e4bS-tCic-ZCFs-OstIf9
LV Write Access read/write
LV Creation host, time archiso, 2015-11-06 08:52:52 +0100
LV Status available
# open 1
LV Size 2,70 TiB
Current LE 709046
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 254:3And now is all working perfectly
Thanks for the help.
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