Apple Xserve RAID User's guide User's Guide download pdf (Page 12)

12 RAID Utility User Guide

Solving Problems

The following paragraphs may help you identify or solve a problem you’re having with

your RAID volumes.

If the Battery Isn’t Fully Charged

If you just installed the RAID card, the battery might not have nished conditioning.

Conditioning can take up to 12 hours and starts when you rst turn on the computer

after installing the card.

If you’ve been using the card for more than three months, the battery might be

in a reconditioning cycle. Every 90 days, the battery is completely discharged and

recharged to keep it in good condition.

If you have a new computer that came with the RAID card already installed, the battery

might not have reached full charge. Charging may take a few hours.

In any case, RAID Utility alerts you that the battery is charging or conditioning, and

that write caches are disabled. Performance may be slightly degraded during this time,

but will return to normal when the battery is recharged.

To see if your battery is charging or reconditioning:

Open RAID Utility and click Status in the left column. m

You can also check the battery status using System Proler. Choose About This Mac

from the Apple menu and click More Info. Then select Hardware RAID under Hardware

in the Contents list. System Proler is also available in /Applications/Utilities/.

If the Write Caches are Disabled

The RAID card battery may be conditioning or not fully charged. To protect your

data, the RAID card automatically disables write caching whenever the battery isn’t

fully charged. When the card is new, and again every three months, the RAID card

conditions the battery by completely discharging and then recharging it.

If you accept the risk of a power failure and possible data loss, you can force the write

caches on when the battery is not fully charged.

WARNING: If you enable the write caches when the battery is not fully charged, you

might lose data if the power to your computer fails.

To force write caching on:

Open RAID Utility, click Status, and then click the Force On button next to Write Cache m

Status.

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Apple Xserve RAID User's guide User's Guide Page 12