Missing Device Files

Question

We had an issue with our SAN this morning and we were missing some device files but not all. I cannot seem to find anything that shows what device files ASM is expecting to see for each disk group. For example, we have a data disk group with 10 LUNs assigned. Two of the LUNs were not found and there were no device files. How do I know what device files are missing?

Answer 1

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How do I know what device files are missing?
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What is your 4 digit Oracle version?
The V$ASM_DISK view will tell you what it found and what is missing.
See the Database reference
http://docs.oracle.com/cd/B28359_01/server.111/b28320/dynviews_1020.htm
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V$ASM_DISKIn an Automatic Storage Management instance, V$ASM_DISK displays one row for every disk discovered by the Automatic Storage Management instance, including disks which are not part of any disk group. In a database instance, V$ASM_DISK only displays rows for disks in disk groups in use by the database instance.
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There are several other V$ASM views that have other information that may be of interest
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V$ASM_ALIAS view, 7.17
V$ASM_ATTRIBUTE view, 7.18
V$ASM_CLIENT view, 7.19
V$ASM_DISK view, 7.20
V$ASM_DISK_IOSTAT view, 7.21
V$ASM_DISK_STAT view, 7.22
V$ASM_DISKGROUP view, 7.23
V$ASM_DISKGROUP_STAT view, 7.24
V$ASM_FILE view, 7.25
V$ASM_OPERATION view, 7.26
V$ASM_TEMPLATE view, 7.27