ASM Disk not found

Hi,
I am installing the Grid Infrastructure for a cluster (11.2). In the installer screen where an ASM disk group should be chosen, no disk appears.
But a disk appears if a execute "oracleasm listdisks" in the command line. Any idea?
The "oracleasm status" informs the disk is not mounted. Is that the problem?

Hi David:
uname -a
Linux cwb02efnora04.keybank.com 2.6.18-164.el5 #1 SMP Tue Aug 18 15:51:48 EDT 2009 x86_64 x86_64 x86_64 GNU/Linux
cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.4 (Tikanga)
rpm -qa|grep oracleasm
oracleasm-support-2.1.3-1.el5
oracleasmlib-2.0.4-1.el5
oracleasm-2.6.18-164.el5-2.0.5-1.el5
lsmod|grep oracle
oracleasm 84136 1
grep oracleasm /proc/filesystems
nodev oracleasmfs
oracle@cwb02efnora04:/u01/app/oracle>df -ha |grep oracleasm >a
oracleasmfs 0 0 0 - /dev/oracleasm
ls -l /dev/oracleasm/disks/
total 0
brw-rw---- 1 oracle dba 120, 17 Nov 27 12:53 QDATA1
brw-rw---- 1 oracle dba 120, 33 Nov 27 12:53 QDATA2
brw-rw---- 1 oracle dba 120, 49 Nov 27 12:53 QDATA3
brw-rw---- 1 oracle dba 120, 97 Nov 27 13:33 QDATA4
brw-rw---- 1 oracle dba 120, 113 Nov 27 13:34 QDATA5
brw-rw---- 1 oracle dba 120, 65 Nov 27 12:53 QFLASH1
brw-rw---- 1 oracle dba 120, 81 Nov 27 12:53 QFLASH2
~
thank you so much
Susan

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