[CentOS] formatting large volume

Craig White craigwhite at azapple.com
Wed Oct 15 16:52:03 UTC 2008

On Wed, 2008-10-15 at 09:47 -0400, Ross Walker wrote:
> On Oct 14, 2008, at 10:36 PM, Craig White <craigwhite at azapple.com>  
> wrote:
> > I just got a new server with a Dell MD-1000 SAS unit and 6-750  
> > gigabyte
> > drives which are now initializing in RAID 10 which will give me just
> > about 2 terabytes.
> >
> > I vaguely recall reading that fdisk wasn't suitable for partitioning  
> > and
> > wonder if I shouldn't be using partd instead. I am also wondering if I
> > should use lvm or just mkfs to create the filesystem. Anyone have
> > suggestions before I blunder in?
> Just pvcreate the whole disk and forgo partitioning it. Then create a  
> vg out of it and start creating lvs.
OK - makes sense but I am a bit confused here.

I have done the pgcreate and tested lvcreate but wonder about
'setphysicalextentsize' because in the man page, it states, "The default
of 4 MB leads to a maximum logical volume size of around 256GB" which
makes me think that if I want one volume when this is all done, I have
to increase that value.

# fdisk -l /dev/sdb

Disk /dev/sdb: 2248.8 GB, 2248818032640 bytes
255 heads, 63 sectors/track, 273403 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdb doesn't contain a valid partition table

So thinking that I would need a volume just under 10 times the maximum
of 256GB, I would have to set the physicalextentsize to 64 MB (32 not
being quite large enough and thus 64 being the next increment in power
of 2)

Does this make sense?


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