ATTO Technology SC 5700 Configure Storage into RAID Groups, Features you may choose, Auto-Rebuild

4.0 Configure Storage into RAID Groups

The ATTO FastStream allows configuration of storage into DVRAID, JBOD, RAID Level 0, 1, 1+0, 4 or 5 for the FastStream SC 5300 and 5700, plus RAID Level 6 for the FastStream SC 5500, with the ability to create multiple partitions.

RAID is a storage configuration which uses multiple drives to increase capacity, performance and/or reliability. The FastStream can set up an application- ready RAID configuration automatically, you may custom design a RAID configuration, or you may combine a custom and an automatic configuration. The FastStream uses all available drives when you select Quick Digital Video, General Digital Video, Audio, General IT or Database. Available drives include those which are on-line and not currently configured for RAID.

If you wish to have more than one type of RAID group in your system, you have several options:

•Set up a customized RAID group (refer to Creating a custom setup on page 16), then return to the main menu and select a particular application to use the remainder of your attached storage.

•Attach only the storage you want using an automated setup (refer to Selecting an application ), then attach more storage and use either the custom or specific user processes outlined in this chapter

•Set up storage now using any of the processes in this chapter, then modify or add to storage

using the procedures listed in Modify Storage on page 31.

CAUTION

Before creating any RAID group you should initialize and verify the drives you want in the RAID group. Refer to Ensure Drive Integrity on page 11.

RAID improves data accessibility and reliability during normal operations, however, you still need a good backup strategy for long-term protection of data.

When you have created RAID groups, you may use, monitor and modify the storage as needed. Refer to Modify System Values on page 19, Manage ATTO Devices, Configurations on page 37, Monitor Storage, Configurations on page 21 and Modify Storage on page 31.

Features you may choose

Depending on the application you choose, the number of drives you choose and several other factors, you may have other choices to customize your FastStream to your particular needs.

Some features are customized by you only if you use the custom setup. Refer to Creating a custom setup on page 16.

Auto-Rebuild

When Auto-Rebuildis enabled and an existing RAID group member becomes faulted, the appliance initiates a rebuild using an available unallocated drive. If no drives are available, the rebuild is initiated only after you replace the faulted drive and initiate a system scan to discover the drive. Hot Spares will be used first, regardless of the Auto-Rebuild setting.

Various outcomes are available when Auto-Rebuild is

enabled...

•And an existing RAID group member becomes faulted or unavailable, such as when a drive is pulled out from an array, the appliance initiates a rebuild using an available unallocated drive.

•Or if an appliance boots up with drives missing or faulted, the FastStream tries to switch them out automatically.

•Exception: FastStream SC 5300 requires a system scan using the CLI command BlockDevScan before the drive is known to be faulted or unavailable unless data is running to the drive, in which case the RAID member becomes faulted and is swapped with a replacement.

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ATTO Technology Inc. FastStream SC Installation and Operation Manual