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Solaris Volume Manager Administration Guide
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Document Information


1.  Getting Started With Solaris Volume Manager

2.  Storage Management Concepts

3.  Solaris Volume Manager Overview

4.  Solaris Volume Manager for Sun Cluster (Overview)

5.  Configuring and Using Solaris Volume Manager (Scenario)

6.  State Database (Overview)

7.  State Database (Tasks)

8.  RAID-0 (Stripe and Concatenation) Volumes (Overview)

9.  RAID-0 (Stripe and Concatenation) Volumes (Tasks)

10.  RAID-1 (Mirror) Volumes (Overview)

Overview of RAID-1 (Mirror) Volumes

Overview of Submirrors

Scenario--RAID-1 (Mirror) Volume

Providing RAID-1+0 and RAID-0+1

RAID-1 Volume (Mirror) Resynchronization

Full Resynchronization

Optimized Resynchronization

Partial Resynchronization

Creating and Maintaining RAID-1 Volumes

Configuration Guidelines for RAID-1 Volumes

Performance Guidelines for RAID-1 Volumes

About RAID-1 Volume Options

RAID-1 Volume Read-and-Write Policies

Pass Number

Understanding Submirror Status to Determine Maintenance Actions

The Affect of Booting Into Single-User Mode on RAID-1 Volumes

Scenario--RAID-1 Volumes (Mirrors)

11.  RAID-1 (Mirror) Volumes (Tasks)

12.  Soft Partitions (Overview)

13.  Soft Partitions (Tasks)

14.  RAID-5 Volumes (Overview)

15.  RAID-5 Volumes (Tasks)

16.  Hot Spare Pools (Overview)

17.  Hot Spare Pools (Tasks)

18.  Disk Sets (Overview)

19.  Disk Sets (Tasks)

20.  Maintaining Solaris Volume Manager (Tasks)

21.  Best Practices for Solaris Volume Manager

22.  Top-Down Volume Creation (Overview)

23.  Top-Down Volume Creation (Tasks)

24.  Monitoring and Error Reporting (Tasks)

25.  Troubleshooting Solaris Volume Manager (Tasks)

A.  Important Solaris Volume Manager Files

B.  Solaris Volume Manager Quick Reference

C.  Solaris Volume Manager CIM/WBEM API


RAID-1 Volume (Mirror) Resynchronization

RAID-1 volume (mirror) resynchronization is the process of copying data from one submirror to another submirror when one of the following occurs:

While the resynchronization takes place, the mirror remains readable and writable by users.

A mirror resynchronization ensures proper mirror operation by maintaining all submirrors with identical data, with the exception of writes in progress.

Note - A mirror resynchronization should not be bypassed. You do not need to manually initiate a mirror resynchronization. This process occurs automatically.

Full Resynchronization

When a new submirror is attached (added) to a mirror, all the data from another submirror in the mirror is automatically written to the newly attached submirror. Once the mirror resynchronization is done, the new submirror is readable. A submirror remains attached to a mirror until it is detached.

If the system crashes while a resynchronization is in progress, the resynchronization is restarted when the system finishes rebooting.

Optimized Resynchronization

During a reboot following a system failure, or when a submirror that was offline is brought back online, Solaris Volume Manager performs an optimized mirror resynchronization. The metadisk driver tracks submirror regions. This functionality enables the metadisk driver to know which submirror regions might be out-of-sync after a failure. An optimized mirror resynchronization is performed only on the out-of-sync regions. You can specify the order in which mirrors are resynchronized during reboot. You can omit a mirror resynchronization by setting submirror pass numbers to zero. For tasks associated with changing a pass number, see Example 11-16.


Caution - A pass number of zero should only be used on mirrors that are mounted as read-only.

Partial Resynchronization

Following the replacement of a slice within a submirror, Solaris Volume Manager performs a partial mirror resynchronization of data. Solaris Volume Manager copies the data from the remaining good slices of another submirror to the replaced slice.