Less known Solaris Features: Point-in-time copy with AVS - Part 10: Administration

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< Less known Solaris Features: Point-in-time copy with AVS - Part 9: Disaster recovery | Less known Solaris Features: Point-in-time copy with AVS - Part 11: Conclusion >

Less known Solaris Features: Point-in-time copy with AVS - Part 10: Administration

Sunday, April 27. 2008

Okay, there are several administrative procedures with the point-in-time copy functionality. I will describe only the most important ones, as i don´t want to substitute the manal with this tutorial.

Deleting a point-in-time copy configuration

Okay, let´s assume you used the following configuration so far:

# iiadm -l dep /dev/rdsk/c1d0s3 /dev/rdsk/c1d1s6 /dev/rdsk/c1d1s4

It´s really easy to delete this config. As i mentioned before,  the name of the shadow volume cleary indicates a point-in-time copy configuration, as there can be only one configuration for any given shadow volume. So you use the name of the shadow volume to designate a configuration. Thus the command to delete the configuration is fairly simple:# iiadm -d /dev/rdsk/c1d1s6
The -d tells iiadm to delete the config. When we recheck the current AVS configuration, the config for /dev/rdsk/c1d1s6 is gone:# iiadm -l

# 


Forcing a full copy resync of a point-in-time copy
Whenever you are in doubt of the consistency of you point-in-time copy (flacky disks, you´ve swapped a disk) it may be sensible to force a full copy resync instead of coping only the changed parts. Le´ts assume the follwing config of an independent copy:# iiadm -l

ind /dev/rdsk/c1d0s3 /dev/rdsk/c1d1s3 /dev/rdsk/c1d1s4
Again you use the name of the shadow volume to designate the configuration. You force the full copy resync with a single command:# iiadm -c s /dev/rdsk/c1d1s3
When we check the status of the dependent copy, you will see that a full copy is in progress:

# iiadm -i

/dev/rdsk/c1d0s3: (master volume)

/dev/rdsk/c1d1s3: (shadow volume)

/dev/rdsk/c1d1s4: (bitmap volume)

Independent copy, copy in progress, copying master to shadow

Latest modified time: Sun Apr 27 01:49:21 2008

Volume size:   273105

Shadow chunks total: 4267 Shadow chunks used: 0

Percent of bitmap set: 69

        (bitmap dirty)
Let´s wait for a few moments and check the status again:# iiadm -i

/dev/rdsk/c1d0s3: (master volume)

/dev/rdsk/c1d1s3: (shadow volume)

/dev/rdsk/c1d1s4: (bitmap volume)

Independent copy

Latest modified time: Sun Apr 27 01:49:21 2008

Volume size:   273105

Shadow chunks total: 4267 Shadow chunks used: 0

Percent of bitmap set: 0

        (bitmap clean)
The full copy resync has completed.



Grouping point-in-time copies
Sometimes the data of an application is distributed over several disks. For example because you application is rather old can use only volumes sized at 2 Gigabytes each. When you want to make a consistent point-in-time copy of all volumes, you have to do it at the same time. To enable the admin to do so, you can group point-in-time copies. When you use the groupname, all members of the group get the commands at the same time.



Okay, let´s assume we have an independent copy so far. # iiadm -l

ind /dev/rdsk/c1d0s3 /dev/rdsk/c1d1s3 /dev/rdsk/c1d1s4
Now we want to configure another one for the volume /dev/rdsk/c1d0s5 with /dev/rdsk/c1d1s5 as the shadow volume and /dev/rdsk/c1d1s6 as the bitmap volume. 



At first we move the existing configuration into a group. I will name it database in my example but you could choose any other name for it.# iiadm -g database -m /dev/rdsk/c1d1s3
With -g we designate the groupname and with -m we move the volume into the group. As usual we use the name of the shadowvolume to designate the configuration.



Now we create the point-in-time copy of the second volume. But we will create it directly in the group. To do so, we need the -g switch.# iiadm -g database -e dep /dev/rdsk/c1d0s5 /dev/rdsk/c1d1s5 /dev/rdsk/c1d1s6
Please notice, that we used a different copy mechanism for the point-in-time copy. The don´t have to be identical in the group.



Let´s check the state of our copies:# iiadm -i

/dev/rdsk/c1d0s3: (master volume)

/dev/rdsk/c1d1s3: (shadow volume)

/dev/rdsk/c1d1s4: (bitmap volume)

Group name: database

Independent copy

Latest modified time: Sun Apr 27 01:49:21 2008

Volume size:   273105

Shadow chunks total: 4267 Shadow chunks used: 0

Percent of bitmap set: 0

        (bitmap clean)

------------------------------------------------------------------------------

/dev/rdsk/c1d0s5: (master volume)

/dev/rdsk/c1d1s5: (shadow volume)

/dev/rdsk/c1d1s6: (bitmap volume)

Group name: database

Dependent copy

Latest modified time: Sun Apr 27 02:05:09 2008

Volume size:   273105

Shadow chunks total: 4267 Shadow chunks used: 0

Percent of bitmap set: 0

        (bitmap clean)
Now let´s initiate a full copy resync on the group database: # iiadm -c s -g database
When you check the state of your copies again, you will recognize that you initated a full resync on both copies at the same time:# iiadm -i

/dev/rdsk/c1d0s3: (master volume)

/dev/rdsk/c1d1s3: (shadow volume)

/dev/rdsk/c1d1s4: (bitmap volume)

Group name: database

Independent copy, copy in progress, copying master to shadow

Latest modified time: Sun Apr 27 02:08:09 2008

Volume size:   273105

Shadow chunks total: 4267 Shadow chunks used: 0

Percent of bitmap set: 42

        (bitmap dirty)

------------------------------------------------------------------------------

/dev/rdsk/c1d0s5: (master volume)

/dev/rdsk/c1d1s5: (shadow volume)

/dev/rdsk/c1d1s6: (bitmap volume)

Group name: database

Dependent copy, copy in progress, copying master to shadow

Latest modified time: Sun Apr 27 02:08:09 2008

Volume size:   273105

Shadow chunks total: 4267 Shadow chunks used: 0

Percent of bitmap set: 40

        (bitmap dirty)


            
            
            
                Posted by Joerg Moellenkamp
                                   in Solaris                
                                    at
                 09:12

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            Less known Solaris Features: Point-in-time copy with AVS

            Okay, the next installment of the "Less known Solaris Features" series is online. This time i will discuss the feature Point in time copies with AVS. As i have to go through some theory at first, it´s a quite long tutorial. It´s the longest so far. Point-
        
        
            Weblog: c0t0d0s0.org

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Less known Solaris Features: Point-in-time copy with AVS - Part 10: Administration

Sunday, April 27. 2008

Deleting a point-in-time copy configuration

Forcing a full copy resync of a point-in-time copy

Grouping point-in-time copies

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