LSI 3ware SAS 9750-8i User's Guide download pdf (Page 177)

Background Tasks

www.lsi.com/channel/products 165

Cancelling a Rebuild and Restarting It with a

Different Drive

When you start a rebuild from 3BM, you cannot cancel it in 3BM interface.

However, if you have drives in hot swap bays, you can remove and replace the

drive, rescan the controller (Alt-R), and then select a new drive to be used in

the rebuild. You can also boot the operating system, launch 3DM, and cancel a

rebuild by using the

Remove Drive link on the Maintenance page.

If your drives are not in hot swap bays and you do not want to boot the

operating system and launch 3DM, you can also cancel a rebuild by powering

down the system, physically removing a drive, and installing another one that

you want to use. Then when you start 3BM, the unit will appear as degraded

and you can rebuild it, using the steps described under “Rebuilding Units

through 3BM” on page 162.

Working with the Background Task Mode

Background Task Mode is specifically designed to address the issue of

latency, which can cause problems for some applications, by helping you

balance the rate of host I/O and efficient completion of background tasks.

About Latency and the Background Task Mode

Latency is the real or perceived delay in response time seen by the host

system when accessing some data. For some applications, such as streaming

video and audio application, it is important to minimize the latency of read

commands, so that users do not perceive a lag when viewing video or

listening to audio.

When background tasks are active (for example, rebuild, verify, and

initialization), there can be increased latency, and under some circumstances,

this can result in a degraded user experience or in an application failure.

You can set the

Background Task Mode to minimize latency. This mode

monitors and paces the relationship between host I/Os and background tasks.

You can set the Background Task Mode to either

Adaptive (the default) or

Low Latency.

Low Latency mode minimizes the latency (delay) in reading data from the

RAID unit by slowing down the background task process. In contrast,

Adaptive mode allows the firmware to adjust the interaction of background

Note: If you want to pause the rebuild process through 3DM 2, you can do so by

setting or changing the rebuild schedule on the Scheduling page. If you set a

schedule for rebuilds that does not include the current time, the rebuild process will

pause.

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LSI 3ware SAS 9750-8i User's Guide Page 177

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