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h0mer`-
Apprentice
Joined: 02 Aug 2004
Posts: 215
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 Posted: Thu Jun 21, 2012 9:59 am Post subject: grub2 & GPT & software raid |
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hi,
atm i try to remotely install a software raid 6 on a root server with 7 3TB harddrives. My partitions need to be larger than 2TB so my only option seems to be gpt, right?
i read the wiki entries for raid and gpt and also the grub2 guide http://dev.gentoo.org/~scarabeus/grub-2-guide.xml but i cannot figure out what i really need to make this work.
my main question is
do i need grub2 for the following setup: gpt & software raid & partitions larger than 2tb ? |
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zappatized
n00b
Joined: 18 Aug 2012
Posts: 21
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| Posted: Wed Aug 22, 2012 1:42 am Post subject: |
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Not sure if you're still working on this...
You need GPT format as the MBR headers can't support data past 2TB per partition.
Are you against using grub2?
Are you planning to use lvm?
Not knowing more specific requirements I could only recommend something like this:
| Code: |
Number Start (sector) End (sector) Size Code Name
1 40 2047 1004.0 KiB EF02 BIOS
2 2048 411647 200.0 MiB 8300 Boot
3 411648 1953525134 931.3 GiB 8E00 data
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Once you partition the first disk to your liking use:
| Code: | sgdisk -b gpt_part_layout /dev/sda
sgdisk -l gpt_part_layout /dev/sdb
sgdisk -G /dev/sdb
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repeating the last two steps for the rest of the disks. You can put sdx2 partitions in a raid1, but direct grub to load the kernel from sda. If you want flexibility with setting different stripe sizes put a ddf container inside each data partition (even after luks-encrypting) and create desired raids within, then pvs/vgs/lvs on top. The last time I used ddf though I had to reserve a small segment (1M would probably be enough) at the beginning of the container because the lvm data would overwrite some raid data.
Edit to correct egregious partition code error. |
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