[Ocfs2-devel] Large (> 16TiB) volumes revisited

[Patrick J. LoPresti]

On Mon, Jun 28, 2010 at 5:47 PM, Sunil Mushran <sunil.mushran at oracle.com> wrote:
> BTW, have you tested with cleared INCOMPAT_64BIT journal flag?

Hm, easier said than done. "tunefs.ocfs2 -J noblock64 ..." bombs out with:

tunefs.ocfs2: Unknown journal option: "block64"
Valid journal options are:
        size=<journal-size>
Usage: tunefs.ocfs2 [options] <device> [new-size]
[etc.]

By the way, it complains similarly about "tunefs.ocfs2 -J block64",
which puts the lie to the failure message in my patch...

When I try to re-format the partition without "-J block64", I get:

ERROR: jbd can only store block numbers in 32 bits. /dev/md0 can hold
5082795264 blocks which overflows this limit. If you have a new enough
Ocfs2 with JBD2 support, you can try formatting with the "-Jblock64"
option to turn on support for this size block device.
Otherwise, consider increasing the block size or decreasing the device size.


 - Pat