RHEL3 maximum disk size? 2006-02-22 - By Matt Domsch
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On Wed, Feb 22, 2006 at 03:11:32PM +0100, Jos Vos wrote:
> On Wed, Feb 22, 2006 at 09:03:10AM -0500, Mike Smorul wrote:
>
> > I think the limit is 2Tb volume groups when working w/ lvm.
>
> And if I don't need to use LVM, just primary partitions of 2 GB
> for 2 GB ext3 filesystems? Can partitioning tools (and the
> kernel) then deal with cabinets (== virtual SCSI disks) of 6 GB,
> for example, on which I make 3 partitions?
You hit the block layer limit using "signed int", meaning 31 usable
bits, meaning 1TB, for the size of any single block device. This is
independent of partitioning, lvm, raid, etc. This was fixed in one of
the most recent Update kernels, so it can go to 2TB.
You need a 2.6 kernel-based product to resolve this limit.
Once you're running say RHEL4, in order to partition block devices
that are >2TB, you can't use msdos partition tables (those are limited
to 2TB). You have to use GPT partition tables, or LVM (with or w/o
partitions).
# parted /dev/sdb mklabel gpt
Then you can use parted to create partitions of virtually any size, it
uses 64-bit block numbers.
Then you start hitting other limits, like the max size of a single
ext3 file system (8TB on x86 IIRC), etc.
Thanks,
Matt
--
Matt Domsch
Software Architect
Dell Linux Solutions linux.dell.com & www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com
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