Disk partitioning miscellanea

From FnordWiki
Revision as of 22:06, 12 July 2012 by Adj (talk | contribs) (→‎GPT is cool)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to navigation Jump to search

GPT is cool

For grub to boot a non-EFI machine from an GPT-partitioned disk, leave a gap between sector 0 and the first partition. Starting the first partition at sector 2048 accomplishes this nicely.

EFI machines will need an EFI boot partition, too. A bit annoying, but it doesn't hurt to skip it on the

boot mirror creation

This is how van-van-mojo's boot mirror looks:

/dev/sda1 (and the other boot mirror member devices) starts at sector 2048, leaving a 1Mibyte gap before it (them) and the start of the disk.

/dev/sda1 is 2099224 sectors long. Which is 1Gibyte for data plus 1036kibytes for software RAID metadata and overhead.

mdadm --create md_boot --verbose --metadata=1.2 --chunk=64 --level=1 --raid-devices=6 --name md_boot /dev/sda1 missing missing missing missing missing

MD software RAID offsets

12kibytes are used by the MD metadata. If you want a RAID-1 MD device with a capacity of 1Gibyte, create the partitions with 2097176 sectors.

Retrieved from "https://wiki.fnord.greeley.co.us/mediawiki/index.php?title=Disk_partitioning_miscellanea&oldid=193"