Hello Michal,
On Thu, 13 Nov 2008, Michal Soltys wrote:
is it possible to create md partitions larger than 0.4TB?
We have >=9TB RAID-0 systems, and I tried to create a partitionable
two-partition md with mdadm --auto=mdp2 and partition it into for example
16MB and ~9TB. For partitioning /dev/md_d0 I have tried sfdisk, fdisk,
cfdisk, parted, ... Regardless of the partitioning tool, the ~9TB partition
always ends up as 455780.07MB i.e. 0.4TB.
I'm assuming you tried standard MBR layout - you can't go above ~ 2TB limit
with it - you need either GPT, or use the device directly (as in md0 case). I
have one 1.5TB partition running happily on one of my systems (still within
limits of old MBR layout, but under GPT).
Aha, with GPT it works perfectly,
parted /dev/md_d0 --script mklabel gpt
parted /dev/md_d0 --script mkpart primary1 0 128M
yes | parted /dev/md_d0 -- mkpart primary2 128M -1
... mkfs.* ...
parted /dev/md_d0 --script print
Number Start End Size File system Name Flags
1 17.4kB 128MB 128MB ext2 primary1
2 128MB 9252GB 9252GB xfs primary2
and the final size of md_d0p2 is a correct 9252GB. The system does not
boot from RAID, we just use the raid0 for >>4 Gbps data acquisition. Good
to know about the newer superblock versions (mdadm -e option).
Thanks for your help!
- Jan
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