On 05/02/12 18:47, Gianni Giardina wrote:
Hi.
The following HowTo on the CentOS Wiki:
http://wiki.centos.org/HowTos/Install_On_Partitionable_RAID1
valid for CentOS 5, has not been updated to CentOS 6, yet. I found it
very useful during the glorious CentOS 5 days and now that I've
successfully ported my RAID1 experience to CentOS 6, I'd like to share
it with the Community.
I have a question regarding partionable RAID :
why should the --metadata=0.90 be used?
in my man page (centos 6.2) i have this :
-e, --metadata=
Declare the style of RAID metadata (superblock) to be used. The
default is 1.2 for --create, and to guess for other operations. The
default can be overridden by setting the metadata value for the CREATE
keyword in mdadm.conf.
Options are:
0, 0.90 Use the original 0.90 format superblock. This format limits
arrays to 28 component devices and limits component devices of levels 1
and greater to 2 terabytes. It is also possible for there to be
confusion about whether the superblock applies to a whole device or just
the last partition, if that partition starts on a 64K boundary.
1, 1.0, 1.1, 1.2 default Use the new version-1 format superblock.
This has fewer restrictions. It can easily be moved between hosts with
different endian-ness, and a recovery operation can be checkpointed and
restarted. The different sub-versions store the superblock at different
locations on the device, either at the end (for 1.0), at the start (for
1.1) or 4K from the start (for 1.2). "1" is equivalent to "1.2".
"default" is equivalent to "1.2".
given the existence of 2+ tb hdd, metadata 0.9 is no go from the start
... so, why 0.9 ?
Thanks,
Adrian
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