Hp Insight Management Agents User Manual download pdf (Page 40)

• Total Memory—Displays the total amount of accelerator memory, including both battery-backed

and non-battery-backed memory.

• Write Cache—Displays the percentage of cache memory allocated for posted write caching

or the amount of memory allocated for the write cache. If the amount of memory is displayed

then the actual usable memory is half the amount shown because the data is kept in duplicate

(mirrored).

• Read Cache—Displays the percentage of cache memory allocated for read ahead caching

or the amount of memory allocated for the read cache. If the amount of memory is displayed

then the actual usable memory is half the amount shown because the data is kept in duplicate

(mirrored).

NOTE: Read cache is not available on IDA-2 or SCSI Managed Array Technology (SMART)

controllers. Values for these controllers will be 0.

• Write Errors—Displays the total number of write memory parity errors that were detected while

writing to the Array Accelerator.

Write parity errors occur when the system detects that information has not been transferred

to the Array Accelerator correctly. A parity bit is included for each byte of information stored

in memory. When the microprocessor reads or writes data, the system counts the value of the

bits in each byte. If the total does not match the system's expectations, a parity error has

occurred.

• Read Errors—Displays the total number of read memory parity errors that were detected while

reading from the Array Accelerator. The mirrored copy of data in the write cache can be

accessed to obtain correct data if a memory parity error occurs.

Memory parity errors occur when the system detects that information has not been transferred

correctly. A parity bit is included for each byte of information stored in memory. When the

microprocessor reads or writes data, the system counts the value of the bits in each byte. If

the total does not match the system's expectations, a parity error has occurred. A bad memory

chip, memory corruption, or lack of memory refresh may cause memory parity errors.

Identify Drives

Select the length of time to identify the physical drives that are connected to this controller from

the drop-down list box and then click the Start button. The page automatically refreshes and displays

an image of an identified drive and a Stop button. Click the Stop button to end identification before

the time expires.

After the drive identification completes, the page must be refreshed manually to display the Start

button. There may be a delay, depending on the length of the HP Insight Management Agents

data collection interval, after the drive identification completes and before the Start button can be

displayed.

Only drives in hot plug trays are supported since the LEDs are part of the tray. If an individual

logical drive or physical drive on this controller is selected while the drives connected to this

controller are currently identified, the other drives stop identification and only the selected drive

are identified.

When there are redundant controllers only the active controller can be used to identify the drives

connected to the controller.

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