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Re: [Linux-cluster] EFI in CLVM



Alan,

Its a FC SAN.

Here is multipath -v2 -ll output and looks good .

--
mpath13 (360060e8004770d000000770d000003e9) dm-28 HITACHI,OPEN-V*4
[size=2.0T][features=1 queue_if_no_path][hwhandler=0][rw]
\_ round-robin 0 [prio=2][active]
 \_ 5:0:1:7 sdt 65:48 [active][ready]
 \_ 6:0:1:7 sdu 65:64 [active][ready]
---


If I don't make an entire LUN a PV, I think I would then need partitions. Am i right? and you think this will reduce the speed penalty?


Thanks
Paras.



On Fri, Aug 12, 2011 at 8:39 PM, Alan Brown <ajb2 mssl ucl ac uk> wrote:
On 12/08/2011 17:24, Paras pradhan wrote:
Does it mean that I don't need mpath0p1 ? If its the case i don't need to run kpartx on mpath0?

You still need kpartx, but that's a bit clunky anyway. Let dm-multipath take care of all that for you.

(The last time I used kpartx and friends was 2003. Dm-multipath and multipathd are much more user-friendly. All you need then is multipath -v2 -ll to verify things are where they should be...)


And not having mpath0p1 will take away this device mapper ioctl failed issue when creating lvcreate?


I think that's a separate issue. What's the underlaying structure? SAN? FC? iscsi? drdb?


I am really confused why this lock has failed , also not sure if this is related to this >2TB LUN.


It's not. Some of my LUNs are 25+Tb



 
FWIW having PVs on LUN partitions introduces a small but measurable speed penalty over making the entire LUN a PV - this is mostly down to the small offset a partition table adds to the front of the LUN.




 


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