logical volume question
 

hi guys,

when i do a lvdisplay /dev/vg00/lg01, it will show this :

LV Permission read/write
LV Status available/syncd
Mirror copies 1
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 1200
Current LE 300
Allocated PE 600
Stripes 0
Stripe Size (Kbytes) 0
Bad block on
Allocation strict
IO Timeout (Seconds) default

then I do a lvextend -l 400 /dev/vg00/lg01 , the LE will become 400 and PE will become 700.

I want to know what is the relation between logical extend and physical extend?

shouldn't PE be fixed ?

Thanks.

You sure PE didn't change to 800 rather than 700?

If it is mirrored then you have 400 LEs but twice as many PEs because you have 2 PEs for each LE.

i see, because it is mirror so the extend will double, if it is not mirror the pe will not double.

Correct.

PE = "physical" extent. You have two "physical" disks for each extent.

LE = "logical" extent. Essentially this is "usable" space. So 2 GB mirrored = 1 GB "usable".

By the way it sounds as if you're discussing HP-UX. If so you should know there are other forums with higher visibility than this one for HP-UX.

HP has forums at itrc.hp.com.

Also there is a mailing list called Dutchworks. Details for it:
To subscribe/unsubscribe to this list, contact
majordomo@dutchworks.nl
Name: hpux-admin@dutchworks.nl
Owner: owner-hpux-admin@dutchworks.nl

Archives: ftp.dutchworks.nl:/pub/digests/hpux-admin (FTP, browse only)
http://www.dutchworks.nl/htbin/hpsysadmin (Web, browse & search)


For whatever reason the folks that run Linuxquestions.org don't seem to think HP-UX worthy of its own forum so there's no reason to use them for it.