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EFI label supports physical disks and logical volumes that are > 2 TB in size. SMI support is limited to 2 TB.
Listed below are some of the characteristics and patterns that can help identify and differentiate an EFI labeled disk from a SMI labeled disk.
Device cxtxd0 [without any slice suffix] represents the entire disk
No cylinder information is stored in the EFI label.
No overlapping slices / partitions
eg.,
EFI label disk:
Notice that there are no overlapped partitions and no references to cylinders in the following prtvtoc
output.
% prtvtoc /dev/rdsk/c0t5000CCA04E0DEDD8d0 * /dev/rdsk/c0t5000CCA04E0DEDD8d0 partition map * * Dimensions: * 512 bytes/sector * 390721968 sectors * 390721901 accessible sectors * * Flags: * 1: unmountable * 10: read-only * * Unallocated space: * First Sector Last * Sector Count Sector * 34 6 39 * 390070312 635239 390705550 * * First Sector Last * Partition Tag Flags Sector Count Sector Mount Directory 0 4 00 40 2097152 2097191 1 4 00 2097192 384827392 386924583 4 4 00 386924584 3145728 390070311 8 11 00 390705551 16384 390721934
SMI label disk:
Notice the overlapped partitions (0 & 2. also 2 & 6) and references to cylinders in the following prtvtoc
output.
# prtvtoc /dev/rdsk/c0t5000A72030082BD5d0s2 * /dev/rdsk/c0t5000A72030082BD5d0s2 partition map * * Dimensions: * 512 bytes/sector * 56 sectors/track * 224 tracks/cylinder * 12544 sectors/cylinder * 11429 cylinders * 11427 accessible cylinders * * Flags: * 1: unmountable * 10: read-only * * First Sector Last * Partition Tag Flags Sector Count Sector Mount Directory 0 2 00 0 263424 263423 1 3 01 263424 263424 526847 2 5 01 0 143340288 143340287 6 4 00 526848 142813440 143340287
Existence of /dev/[r]dsk/cxtxd0 implies EFI label. In case of SMI label, /dev/[r]dsk/cxtxd0 won't exist.
eg.,
EFI label disk:
% ls /dev/rdsk/c0t5000CCA04E0DEDD8d0 /dev/rdsk/c0t5000CCA04E0DEDD8d0
SMI label disk:
# ls /dev/rdsk/c0t5000A72030082BD5d0 /dev/rdsk/c0t5000A72030082BD5d0: No such file or directory
The presence of "wd" (whole disk?) in device path of the physical device may imply EFI label.
eg.,
EFI label disk:
% stat -c "%N" /dev/rdsk/c0t5000CCA04E0DEDD8d0 β/dev/rdsk/c0t5000CCA04E0DEDD8d0β -> β../../devices/scsi_vhci/disk@g5000cca04e0dedd8:wd,rawβ
SMI label disk:
# stat -c "%N" /dev/rdsk/c0t5000A72030082BD5d0s2 '/dev/rdsk/c0t5000A72030082BD5d0s2' -> '../../devices/scsi_vhci/disk@g5000a72030082bd5:c,raw'
As of this writing, devinfo(1M)
does not support EFI labeled disks.
eg.,
EFI label disk:
% devinfo -i /dev/rdsk/c0t5000CCA04E0DEDD8d0 devinfo: /dev/rdsk/c0t5000CCA04E0DEDD8d0: This operation is not supported on EFI labeled devices
SMI label disk:
# devinfo -i /dev/rdsk/c0t5000A72030082BD5d0s2 /dev/rdsk/c0t5000A72030082BD5d0s2 0 0 12544 512 4
Credit: various internal sources
Labels: sparc label smi solaris disks efi
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