ASM 11.2.0.3 On Solaris Discovers Slices That Start On Cylinder 0
(Doc ID 1529691.1)
Last updated on JANUARY 24, 2020
Applies to:
Oracle Database - Enterprise Edition - Version 11.2.0.3 and laterOracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Solaris on SPARC (64-bit)
Symptoms
ASM instance in 11.2.0.3 discovers the s2 slices of all disks as an available (candidate) for ASM.
The s2 slice starts at cylinder 0 which are getting discovered by ASM.
The first 2 cylinders are used by ASM to write the VTOC.
Document ASM Does Not Discover Disk on Solaris mentions this VTOC related information.
Example disk partition:
==============================
Part Tag Flag Cylinders Size Blocks
0 root wm 3 - 27303 99.98GB (27301/0/0) 209671680
1 unassigned wu 0 0 (0/0/0) 0
2 backup wu 0 - 27303 99.99GB (27304/0/0) 209694720
3 unassigned wm 0 0 (0/0/0) 0
4 unassigned wm 0 0 (0/0/0) 0
5 unassigned wm 0 0 (0/0/0) 0
6 unassigned wm 0 0 (0/0/0) 0
7 unassigned wm 0 0 (0/0/0) 0
SQL> Select PATH,HEADER_STATU from v$asm_disk;
PATH HEADER_STATU
-------------------------------------------------- ------------
/dev/rdsk/c3t60060E8005492800000049280000319Dd0s0 MEMBER
/dev/rdsk/c3t60060E8005492800000049280000319Dd0s2 CANDIDATE
/dev/rdsk/c3t60060E8005492800000049280000319Ed0s0 MEMBER
/dev/rdsk/c3t60060E8005492800000049280000319Ed0s2 CANDIDATE
/dev/rdsk/c3t60060E8005492800000049280000319Fd0s0 MEMBER
/dev/rdsk/c3t60060E8005492800000049280000319Fd0s2 CANDIDATE
/dev/rdsk/c3t60060E800549280000004928000031A0d0s0 MEMBER
/dev/rdsk/c3t60060E800549280000004928000031A0d0s2 CANDIDATE
As you can see s2 slices are getting discovered.
Before 11.2.0.3 these slices where skipped by ASM.
Cause
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In this Document
Symptoms |
Cause |
Solution |
References |