M04-LogicalStorage

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Logical Storage

Module 4

Data ONTAP 8.0 7-Mode

Administration


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2009 NetApp. All rights reserved.

Module Objectives

By the end of this module, you should be able to:

Explain volume concepts in Data ONTAP

Define and create a flexible volume

Execute vol commands

Define and create qtrees


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Volumes


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Volumes

Volumes represent logical storage

Data ONTAP allows up to 500 volumes per

storage system

Volumes are accessible through supported

protocols such as CIFS or NFS Data ONTAP 8.0 and later supports the

following types of volumes:

Flexible volumes, also known as FlexVol

volumes

Traditional volumes (deprecated)

Additional product-specific volumes such as

SnapLock volumes and FlexClone volumes


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Rules for Volumes

A volume name must:

Begin with either a letter or underscore

character (_)

Contain only letters, digits, and underscore

characters Contain no more than 255 characters

The maximum size of a flexible volume is

limited by the maximum containing aggregate

size with a space guaranteed volume

(Discussed in Module 12)


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Root Volumes

One root volume per storage system

Only 32-bit aggregate is recommended

Minimum recommended size is 2 GB (1-GB

swapfile used on root)

Root volume contains the /etc directory

Root volume is accessible using:

/vol/vol_namesuch as /vol/vol0

Simply /

Special virtual root path

Root volume

Directory (configuration information)

/vol

/vol0

/etc


7/30 2009 NetApp. All rights reserved.

Volumes Access

All volume path names begin with /vol

The /vol path name is not a directory

The /vol is not accessible

/vol

/vol0

/etc

/users

/cheryl

Special virtual root path

Root volume

Directory (configuration information)

Volume

Directory



Flexible Volumes



Flexible Volumes

Flexible volumes manage the logical layer

independent of the physical layer

Multiple flexible volumes can exist within a

single aggregate

aggr1

FlexVol 1 FlexVol 2



aggr1

Aggregates and FlexVol Volumes

Create RAID Groups

Create aggregate

RAID groups are createdas result

Create FlexVol 1

Only metadata space isused

There is no pre-allocationof blocks to a specificvolume

Create FlexVol 2 WAFL allocates

aggregate space as datais written

Populate volumes

Aggregate

RG1 RG2 RG3

FlexVol 1 FlexVol 2 FlexVol 3

vol1 vol2

vol3



Performance Increases with FlexVol

I/O performance:

Spindle-sharing

makes total

aggregate

performance available

to all volumes

Space utilization:

No pre-allocation of

free space

Free space is

available for use by

other volumes or new

volumes

Vol 1

Vol 2

Vol 3

Vol 4

Free



Creating a Flexible Volume

To create a flexible volume using the CLI:system> vol create volnameaggrnamesize[k|m|g|t]

To create a flexible volume using NetApp

System Manager, use the Volume Wizard

When creating a flexible volume, you musthave the following information available:

Volume name

Aggregate name

Language

Space guarantee settings (Discussed in

Module 12)



Creating a Flexible Volume Using the CLI

The following is an example of a CLI entry

used to create a flexible volume:

system> vol create sales aggr1 20G

Creates a flexible volume called sales in aggr1

20G in size

aggr1

sales



System Manager: Volume Management

Select Volumesto reveal a list of

volumes



System Manager: Volume Creation

Removed Snapshot reserve

default; we discuss Snapshot

copies in Module 11



System Manager: Volume Creation (Cont.)

The new volume



System Manager: Volume Creation (Cont.)

The new volumeusage



Volume Administration

To resize a volume:system> vol size volname [[+|-][k|m|g|t]]

To offline a volume:system> vol offline volname

To online a volume:system> vol online volname

To destroy a volume:system> vol offline volname

system> vol destroy volname

Command Result

vol size flexvol 50m FlexVol volume size is changed to 50 MB

Vol size flexvol +50m FlexVol volume size is increased by 50 MB

Vol size flexvol -25m FlexVol volume size is decreased by 25 MB

First take the

volume offline



System Manager: Volume Management

To delete theselected volume



System Manager: Volume Resize

Increase the

size from 1 GB

to 2 GB



System Manager: Volume Resize (Cont.)

Verify your

request


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System Manager: Volume Resize (Cont.)

The newlyresized volume


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Qtrees


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Qtrees

A qtree is:

A logically defined file system

A special subdirectory at the root of a volume

Viewed as a directory by clients

Qtrees allow the user to:

Further partition data within a volume

Establish unique quotas for the partitioned data

Perform backup and recover with SnapVault

Perform logical mirroring with SnapMirror

4,995 maximum qtrees per volume


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CLI: Qtree Management

To add a qtree using the CLI:

system> qtree create fullpath

Full path: /vol/volname/qtreename

To delete a qtree from CLI:

system>priv set advancedsystem*> qtree delete [-f] fullpath

Delete the directory to remove a qtree:

M:\> dir

08/09/2009 10:02 AM qtree1

M:\> rmdir qtree1

Mapped drive to the volume


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System Manager: Qtree Creation

Select Qtrees

to reveal a list

of qtrees and

volumes


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System Manager: Qtree Management

To delete a

qtree, select it

and then click

Delete

The newly

created qtree


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Module Summary

In this module, you should have learned to:

Explain volume concepts in Data ONTAP

Define and create a flexible volume

Execute vol commands

Define and create qtrees


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Exercise

Module 4: Logical Storage

Estimated Time: 40 minutes


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Check Your Understanding

How does a traditional volume compare to an

aggregate?

An aggregate defines physical disks, while the

term volume relates to the logical collection of

information A traditional volume cannot share disks with

other volumes; therefore, a traditional volume

fully occupies the aggregate containing it,

making the two terms functionally synonymous What is the name of the default root volume?

vol0

M04-LogicalStorage

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