How to Check the Disk I/O in ASM

Hi All,
I have installed the 2 node RAC (10.2.0.4.0) on Enterprise Linux 5.2. I am using ASM to manage the Database Storage using EMC SAN (CX 320). I have configured the seperate LUNs for Datafiles, Redo Log, Archive logs using RAID 1+0. Not using multipathing currently.
How can I check the IO activity , hotspots, disk usage etc from ASM instance? Also looking for your expert advices to monitor the system I/O. Any scripts or utility from where I can back track the cause of High IO. (Using iostat and oswatcher now but it is hard to interpret the output).
Thanks
Naveed

Hi Naveed
Herewith a query to see the disk usage
select name, type, total_mb, free_mb, required_mirror_free_mb,
usable_file_mb from v$asm_diskgroup;
Otherwise is it possible for you to reach the ASM OEM home page on your server ?
it contains the following items :
The status of the ASM instance
A chart that shows the used and free space of each disk group
A list of databases that are serviced by the ASM instance
Alerts and metrics
Links to the ASM Performance, Administration, and Configuration pages

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SAP_ABA     701     0007
SAP_BASIS     701     0007
PI_BASIS     701     0007
ST-PI     2008_1_700     0003
SAP_BS_FND     701     0008
SAP_BW     701     0007
SAP_AP     700     0021
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SAP_APPL     604     0008
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SAP_HRCAR     604     0029
SAP_HRCAT     604     0029
SAP_HRCAU     604     0029
SAP_HRCBE     604     0029
SAP_HRCBR     604     0029
SAP_HRCCA     604     0029
SAP_HRCCH     604     0029
SAP_HRCCL     604     0029
SAP_HRCCN     604     0029
SAP_HRCDE     604     0029
SAP_HRCDK     604     0029
SAP_HRCES     604     0029
SAP_HRCFI     604     0029
SAP_HRCFR     604     0029
SAP_HRCGB     604     0031
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SAP_HRCIE     604     0029
SAP_HRCIN     604     0029
SAP_HRCIT     604     0029
SAP_HRCJP     604     0029
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SAP_HRCNZ     604     0029
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SAP_HRCSG     604     0029
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SAP_HRCTW     604     0029
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EA-HRCAT     604     0029
EA-HRCAU     604     0029
EA-HRCBE     604     0029
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EA-HRCTH     604     0029
EA-HRCTW     604     0029
EA-HRCUN     604     0029
EA-HRCUS     604     0029
EA-HRCVE     604     0029
EA-HRCZA     604     0029
EA-HRGXX     604     0029
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EA-RETAIL     604     0007
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FI-CA     604     0008
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Hi Sateesh,
SAP_ABA 701 0007
SAP_BASIS 701 0007
PI_BASIS 701 0007
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