Nexsan BEAST Series, User Manual, Page: 77 / 267

Disk Statistics
Clicking RAID Information > Disk Stats takes you to the Disk Statistics page, which displays data on how
often individual disks have been accessed and how many retries have been performed in data recovery
attempts. On E-Series systems, this information is organized by drawer (
Pod 0 , Pod 1 , etc.).
Figure 3-23: Disk Statistics page
The Disk Number column displays the disk number, the controller to which it belongs, and an information icon.
Hover the mouse over the information icon for a pop-up dialog that displays that disk’s information. Click the
icon to be taken to that disk’s detail page (see
Disk Information Detail Page on page 74).
The IOs column displays the number of input/output operations (I/Os) performed on the disk.
Read indicates the number of times the drive has been read because of host array access.
Write indicates the number of times the drive has been written to because of host array access.
Others indicates the number of times that the drive has been accessed by the RAID Controller directly.
Examples include array creation, array rebuilds, and verifications.
The Transfer Retries column displays the number of times (for Read and Write operations, respectively) that
the RAID Controller has had to retry an I/O operation due to data transfer problems.
The Media Retries column displays the number of times (for Read and Write operations, respectively) that the
RAID Controller has had to retry an I/O operation due to disk media problems.
The Disk Health column displays a numerical assessment of each drive’s performance based on command
completion times aggregated over time. For SSD drives, it also displays the percentage of expected disk life
left.
Chapter 3: The Graphical User Interface — RAID Information
Nexsan High-Density Storage
User Guide
www.nexsan.com
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