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Why two links of one SAN disk receive IO r/w request at the same time

 
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Why two links of one SAN disk receive IO r/w request at the same time

Hi,

We have two links per each SAN disk. And system is running at oracle RAC/HP cluster.

Generally, one link is working and another is standby. Now, our systems has a funny things.

When read/write SAN disk, I see two links deal with IO request at the same time from sar report.

Below it is an example from sar. It has impact.
(c8t0d0 and c10t0d0 is for the same SAN disk)
Could you please help? The cause is from oracle RAC or HPUX or SAN disks? And I tracked sar data for three days.

Sar example:

11:10:05 ..... r+w/s blks/s avwat avserv
c8t0d0 5 16 0.4 10
c10t0d0 4 8 1 8

Thank a lot,