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Old 10-04-2010, 07:20 AM   #1
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Does UUID depend on the entire HD or on the partitions of the HD?


When I first read about the UUIDs, then I thought there should be only one UUID for the entire HD. But, when I continued reading on different places, then it occurred to me that there is one unique UUID for each partition on the HD. For example on my I get after typing "blkid":

/dev/sda1: TYPE="ntfs" UUID="72C0DE8EC0DE57C5" LABEL="windows"
/dev/sda2: UUID="30fcb748-ad1e-4228-af2f-951e8e7b56df" SEC_TYPE="ext2" TYPE="ext3"
/dev/sda5: TYPE="swap" UUID="8c4e69f8-5074-42c0-8134-0b2429c4c02c"
/dev/sdb1: SEC_TYPE="msdos" UUID="4848-E35A" TYPE="vfat"

Is it really so? Is there an unique UUID created for each HD partition? I guess this should have been done with OS? I want to create RAID1 array depending on this UUIDs, so that my HDs' namings (sda, sdb, sdc and etc.) will not be shifted, after I remove/add a new HD.

Is there also an unique UUID which is determined by the manufacturer? I remember seeing such numbers on the physical HDs' labels.
Old 10-04-2010, 07:25 AM   #2
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Neither - it is an attribute (in this case) of the filesystem.
See the UUID entry on wikipedia.
Old 10-04-2010, 07:37 AM   #3
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Look at the 'Linux File System section to learn more about a filesystem.

Then look at 'Universally Unique Identifier (UUID)'.

You should then understand that the filesystem is within the container with a UUID. The container may be a device or a partition on a device that the filesystem exists on. This label is unique and used to allow functionality across the system.

The above links and others can be found at 'Slackware-Links'. More than just SlackwareŽ links!


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