Cybernetics miSAN-V6, Руководство оператора

Страница: 137 / 190

Using the 3ware Disk Manager® 137
UM-MV-86-B1-0801 Cybernetics
before they can be used. If you want to add drives to be used in the unit, see “Adding a
Drive” on page 138 .
Type of RAID Configuration
Available configuration types include RAID 0, RAID 1, RAID 5, RAID 10, RAID 50 and
Single Disk. For information about the different RAID levels
Appendix C, “Glossary” .
In general, smaller stripe sizes are better for sequential I/O such as video and larger strip
sizes are better for random I/O (such as databases).
Striping size is not applicable for RAID 1, because it is a mirrored array without striping.
Using the default stripe size of 64KB usually gives you the best performance for mixed I/
Os. If your application has some specific I/O pattern (purely sequential or purely random),
you might want to experiment with smaller or larger stripe size.
1. In 3DM, choose Management > Maintenance .
2. In the “Available Drives” list, select the drives you want to include in the unit by
marking the checkbox in front of the Port number for each one.
If you are creating single drive units, (single disks or hot spares), you can configure
multiple drives at once.
3. Click Create Unit .
4. In the dialog box that appears, select the RAID configuration you want.
5. If stripe size applies to the RAID type you select, select a Stripe Size.
6. Click OK .
The new unit will appear in the Unit Maintenance list at the top of the page and the
miSAN-V-Series will be notified of the new unit.
Rebuilding a Unit
When a drive on a unit degrades, you replace it with an available drive and then rebuild
the unit.
1. If necessary, add a new drive to be used to replace the failed drive. (For details, see
“Adding a Drive” on page 138 .)
2. In 3DM, choose Management > Maintenance .
3. In the Unit Maintenance section, select the degraded unit and click Rebuild Unit .
4. When a dialog box displays available drives, select the drive you want to replace the
degraded drive with, and click OK .
Note
Creating a unit erases all data on all drives. Although creating a RAID 1
(mirror) creates a unit that will have a duplicate of data on both drives
after it is put in use, creating a RAID 1 cannot be used to make a backup
copy of data that currently exists on a single drive.