On 2016-01-30, ibrahimabd <
[email protected]> wrote:
Comparison of the EFI Label and the VTOC Label
The EFI disk label differs from the VTOC disk label in the following ways:
Provides support for disks greater than 2 terabytes in size.
Provides usable slices 0-6, where slice 2 is just another slice.
Partitions (or slices) cannot overlap with the primary or backup
label, nor with any other partitions. The size of the EFI label is
usually 34 sectors, so partitions usually start at sector 34. This
feature means that no partition can start at sector zero (0).
No cylinder, head, or sector information is stored in the EFI label.
Sizes are reported in blocks.
Information that was stored in the alternate cylinders area, the last
two cylinders of the disk, is now stored in slice 8.
If you use the format utility to change partition sizes, the
unassigned partition tag is assigned to partitions with sizes equal to
zero. By default, the format utility assigns the usr partition tag to
any partition with a size greater than zero. You can use the partition
change menu to reassign partition tags after the partitions are changed. However, you cannot change a partition with a non-zero size to the
unassigned partition tag
Quated from : http://docs.oracle.com/cd/E19253-01/817-5093/disksconcepts-14/index.html
O.K. Your :Subject: " header mentions problems, but I only see
listing of differences in behavior -- not problem. All of these
features can be worked with -- including you can have a number of
non-zero partitions with the usr tag. This does *not* force you to
*mount* the partitions on /usr --- or anywhere. You can set them up and reserve them until you need them.
Normally, I've found EFI format on drives which have been part
of a hardware RAID array -- or a zfs software RAID array.
I've never had a disk which was in excess of 2 TB to date, but
if that forced me to EFI format -- I could live with it.
I presume that you know how to change between the two formats on
disks which allow it. You need to start the "format" program with the
"-e" (expert) option -- at that point, whenever you label the disk it
will ask which of the two you wish to use. (Probably in the oracle docs
page you pointed to, but I've got other things to do than re-read that. :-)
If any of these features are actually a problem for you --
please explain in what way they are a problem and perhaps we can offer suggestions for work-arounds.
Good Luck,
DoN.
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