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Solaris Volume Manager (SVM): How to Verify Bootability and Active Boot Disk on Mirrored x86 System (Doc ID 1482286.1)

Last updated on OCTOBER 10, 2022

Applies to:

Sun Solaris Volume Manager (SVM) - Version 11.10.0 to 11.10.0 [Release 11.0]
Solaris Operating System - Version 10 10/08 U6 to 10 1/13 U11 [Release 10.0]
Oracle Solaris on x86-64 (64-bit)
Oracle Solaris on x86 (32-bit)


Systems running Solaris x86 mirrored by Solaris Volume Manager (SVM) often use two internal disks, and system administrators want to verify that either disk can be used to boot the system.

This article describes
A) How to boot from different disk of a SVM boot mirror
B) How to check on a running system which disk was used to boot the system

The terms "primary" and "secondary" are often applied to SVM boot disks. In practice neither disk is primary, in that data is written to both simultaneously and read from both, usually in round robin fashion. The term primary can be accurately used to refer to the disk which was the original first submirror, so that the secondary disk acquired its content by SVM mirroring. The other context in which one disk can be said to be primary is in discussing which disk was specified when booting the system, as initially a single disk is always responsible to begin the boot process.

To understand the disk selection and boot process for x86 system you need to refer to
<Document 1482250.1> Solaris Volume Manager (SVM): How to Control Disk Selection when Booting a x86 System/Server


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