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07-25-2013 10:08 PM
07-25-2013 10:08 PM
PVG-strict/partially-distributed Policy?
Hi Experts,
I came acros something PVG-strict/partially-distributed, policy type of LV,
What is this type of plocy means. Why it is partial distributed.
$ lvdisplay /dev/vgCMEXE002/lvodb --- Logical volumes --- LV Name /dev/vgCMEXE002/lvodb VG Name /dev/vgCMEXE002 LV Permission read/write LV Status available/syncd Mirror copies 0 Consistency Recovery MWC Schedule parallel LV Size (Mbytes) 245696 Current LE 15356 Allocated PE 15356 Stripes 0 Stripe Size (Kbytes) 0 Bad block on Allocation PVG-strict/partially-distributed IO Timeout (Seconds) default
Any more information will be helpful,
Thank You..
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07-25-2013 10:33 PM
07-25-2013 10:33 PM
Re: PVG-strict/partially-distributed Policy?
Please post
# vgdisplay -v vgCMEXE002
# lvdisplay /dev/vgCMEXE002/lvodb |head -n 30
Hope this helps!
Regards
Torsten.
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07-26-2013 09:39 AM
07-26-2013 09:39 AM
Re: PVG-strict/partially-distributed Policy?
Hi Torsten,
Please find the output , ..
If there anything wrong or is it configured that way. How is the distribution happening. Why shows partital. Thank you.
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07-26-2013 11:07 AM - edited 07-26-2013 11:08 AM
07-26-2013 11:07 AM - edited 07-26-2013 11:08 AM
Re: PVG-strict/partially-distributed Policy?
The PVG does not make sense here, because you don't have a mirror, but it does not harm in any way.
Here is the distribution:
You can see it is really "partial". I assume it is on SAN. Could you tell more details?
--- Distribution of logical volume --- PV Name LE on PV PE on PV /dev/disk/disk4838 6399 6399 /dev/disk/disk4835 5118 5118 /dev/disk/disk4833 3839 3839
Hope this helps!
Regards
Torsten.
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07-27-2013 10:27 AM
07-27-2013 10:27 AM
Re: PVG-strict/partially-distributed Policy?
Here the PVG-strict doesn't seem to be for a valid reason as you dont use any mirror.
PVG_strict -- Mirror copies are not allowed to sit on the same physical volume group.
Distributed/partially-distributed --> Only one free extent is allocated from the first available physical volume. The next free extent is allocated from the next available physical volume. Allocation of free extents proceeds in round-robin order on the list of available physical volumes.
Difference:
Distributed --> Two consecutive logical extents are guaranteed to be located on different physical volumes.
Partially-distributed --> Two consecutive logical extents are NOT guaranteed to be located on different physical volumes.
00006 /dev/disk/disk4838 00002 current
00007 /dev/disk/disk4838 00005 current
...
...
00011 /dev/disk/disk4838 00009 current
00012 /dev/disk/disk4838 00004 current
Rgds...