lvm extended

lolaferrari
lolaferrari used Ask the Experts™
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In lvm some fs are marked Linux LVM but what is extended? that slice of the disk marked as extended appears to be used but does not appear in pvscan - the only thing showing in pvscan is the lvm partition. just dont understand what the extended space is for. I thought it could be added to a vg but seems to be used up .
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Top Expert 2011
Commented:
You mean the output in "fdisk -l" like
-------------
   Device Boot    Start       End    Blocks   Id  System
/dev/sda4          9775     22800 104631345    5  Extended
-------------
It is extended partition, not filesystem.
For more details about extended partition, please check
http://en.wikipedia.org/wiki/Disk_partitioning#Extended_partition 

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Commented:
thank you

Author

Commented:
Sorry I didn't mean to say fs - does that mean that is free to add to the volume group once it has been brought under volume manager control?
Top Expert 2011

Commented:
No, extended partition is created as second, third or forth partition to allow partition number go beyond 5.
So the actual partition is /dev/sda5, /dev/sda6... which are within /dev/sda4 (extended).
You can see the start sector of /dev/sda5 are the same as /dev/sda4 (in my example, 9775).

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