HP Insight Management Agents - Manual (Page 52)

in the configuration to ensure the uninterrupted availability of uncorrupted data. This
fault-tolerance method is similar to RAID 5 in that parity data is distributed across all
drives in the array, except in RAID ADG the capacity of multiple drives is used to store
parity data. Assuming the capacity of 2 drives is used for parity data, this allows
continued operation despite simultaneous failure of any 2 drives in the array, whereas
RAID 4 and RAID 5 can only sustain failure of a single drive.
— RAID 50—Distributed data guarding (RAID 5) with multiple parity groups.
— RAID 60—Advanced data guarding (RAID 6) with multiple parity groups.
— Unknown—You may need to upgrade your software.
• Capacity—Displays the size of the logical drive.
• Accelerator—Indicates whether the logical drive has an Array Accelerator board configured
and enabled. The following values are valid:
— Enabled—The Array Accelerator board is configured and enabled for this logical drive.
— Disabled—The Array Accelerator board is configured but not enabled for this logical
drive.
— Unavailable—There is no Array Accelerator board configured for this logical drive.
— Unknown—The Storage Agents do not recognize the Array Accelerator board. You
may need to upgrade your software.
• Stripe Size—Displays the size of a logical drive stripe in kilobytes.
• Total Read and Write Requests—Displays the total number of read and write requests for
the logical volume, expressed in reads and writes per second.
• Reads—Displays the number of read requests for the logical volume, expressed in reads per
second.
• Writes—Displays the number of write requests for the logical volume, expressed in writes
per second.
• Sectors Read—Displays the number of sectors read for the logical volume for this interval.
This value is expressed in sectors per second.
• Sectors Written—Displays the number of sectors written for the logical volume for this
interval. This value is expressed in sectors per second.
• OS Assigned Name—Displays the operating system name associated with this logical drive.
• Multipath Status—Displays the overall multipath status of this logical drive. The following
values are valid:
— Not Configured—Indicates that this logical drive is not configured to have multipath
access.
— Redundant—Indicates that all disks of this logical drive currently have more than one
I/O path to the controller.
— Not Redundant—Indicates that all disks of this logical drive previously had more than
one I/O path to the controller but now one or few of them have no redundant I/O path.
• Number Of Parity Groups—Indicates the number of parity groups (i.e. RAID 4/5/6
subvolumes), that are being striped across.
Identify Drive
1. Select the length of time to identify the physical drives that make up the logical drive from
the drop-down list box, and then click the Start button. The page automatically refreshes
and an image of an identified drive and a Stop button appears.
2. Click the Stop button to end identification before the time expires.
After the drive identification completes, the page must be manually refreshed 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 appears.
52 Agent information