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Storage

Figure 4.

Dell Modular Disk Storage Manager GUI

connected to a host using Ethernet, or a

combination of the two

•

Display configuration information, add and

remove storage arrays, and manage Simple

Network Management Protocol (SNMP) and

Simple Mail Transfer Protocol (SMTP) alert

notifications

Figure 5 shows a script file called sample.scr

that creates a 2 GB RAID-5 virtual disk called

"Test" and sets its parameters. To run this script

//sample.scr

create virtualDisk diskGroup=1 RAIDLevel=5 userLabel="Test" owner=0

segmentSize=16 capacity=2GB;

set virtualDisk["Test"] mediaScanEnabled=false;

set virtualDisk["Test"] consistencyCheckEnabled=false;

set virtualDisk["Test"] modificationPriority

=high;

Figure 5.

Sample script for the Dell Modular Disk Storage Manager CLI

DELL POWER SOLUTIONS |

file from the CLI, administrators would enter the

following command (where ipaddress is the

IP address of the storage enclosure):

smcli ipaddress -f sample.scr;

Advanced features of the Dell

PowerVault MD3000

Administrators can use the PowerVault MD3000

and Dell Modular Disk Storage Manager to create

virtual disk snapshots, virtual disk copies, and

May 2007

storage partitions. Virtual disk snapshot creation

and virtual disk copy creation are premium fea-

tures that must be purchased and enabled

separately.

Virtual disk snapshots

Snapshots are persistent point-in-time images

of a specific virtual disk that help eliminate the

application downtime traditionally required to

create system backups. They typically use less

disk space and take less time to create than a

physical copy.

Snapshots are implemented using the

copy-on-first-write method: when virtual disk

data needs to be modified, the original data is

copied to the virtual disk snapshot cache before

it is modified. The virtual disk on which the

snapshot is based—the source virtual disk—

must be a standard virtual disk in the storage

array. Snapshots are typically created so that

software such as a backup application can

access them while the source virtual disk

remains accessible to hosts.

Modular Disk Storage Manager supports

application-aware snapshots, which are recom-

mended for transaction-based applications

where all transaction operations must be com-

pleted for transactions to be valid. Application-

aware snapshots coordinate with the application

using the virtual disk to help ensure the consis-

tency of snapshot data with application data.

Once the snapshot has been created, the snap-

shot engine signals the application to resume

normal processing. Microsoft Volume Shadow

Copy Service (VSS) enables the creation of these

snapshots.

Administrators can use the virtual disk

snapshot feature to perform the following

tasks:

•

Create a complete image of data on a virtual

disk at a particular point in time

•

Provide quick, frequent, nondisruptive

backups

•

Test new versions of a database system with-

out affecting actual data

•

Enable snapshot virtual disks to be read,

written, and copied