Re: Talking about RAID - disks with same id
- Date: Sun, 12 Nov 2017 17:10:59 +0100
- From: Pascal Hambourg <pascal@xxxxxxxxxxxxxxx>
- Subject: Re: Talking about RAID - disks with same id
Le 10/11/2017 à 17:46, Joe Pfeiffer a écrit :
deloptes <deloptes@xxxxxxxxx> writes:
you see in your case PARTUUID is different for both members. In my case it
is identical and this is what is bothering me
It's my understanding that PTUUID on a disk using an MBR corresponds to
the UUID on a disk using a GPT, not to PARTUUID (I don't know what on an
MBR-based disk would correspond to PARTUUID, if anything).
In the blkid syntax :
PTUUID = partition table UUID (in the partition table).
PARTUUID = partition UUID (in the partition table).
UUID = filesystem or other contents UUID (in the partition data).
There are no PTUUID nor PARTUUID in the MSDOS partition table format.
There is only a 32-bit "disk identifier" field in the MBR, which can be
displayed by fdisk. blkid uses it as a poor-man's PTUUID. Also, since
version 3.8, the kernel combines the MSDOS disk identifier (PTUUID) and
the partition numbers to create fake partition UUIDs (PARTUUIDs).
The GPT partition table format has real 128-bit independent PTUUID and