Managing Internal Drives
This chapter contains the following sections:
Internal storage is
the RAID-protected storage that is directly attached to the system. The
internal drives can be of different sizes and use different technologies. Both
IBM Storwize and IBM SAN Volume Controllers support a range of
enterprise-class, nearline-class or flash drives and they automatically detect
internal drives that are attached to them.
Internal drives can be
designated as either an unused, a candidate, or a spare.
You can view the list
of internal drives and their properties in the
Drives report for that selected account in
Cisco UCS Director. The report displays the following
physical and logical properties of all internal drives, and the details of
drive slots of an IBM Storwize or IBM SAN Volume Controller:
is new to the system and cannot be used to create an array or changed to a
drive can be used to create an array or changed to a spare drive.
uses this drive to replace a failed drive. Spares can also be used to replace
system assigned identifier for the drive.
availability between the system and the drive.
use or role of the drive. This attribute determines if the drive can be formed
into an array.
Type—The technology type of the drive as either flash, enterprise, and nearline
amount of usable space that is available on the drive.
identifier for the MDisk.
name of the MDisk that uses the drive.
position of the drive in the array.
identifier for the enclosure that contains the drive slot.
location of the drive within its enclosure.
Internal drives are configured into RAID (Redundant Array of
Independent Disks) arrays and presented as MDisks to the system. When a RAID
member (drive) of an array fails, the system automatically replaces the failed
member with a hot-spare drive and re-synchronizes the array to restore its
no protection against drive failures which can be used for only temporary
volumes. You require a minimum of two drives for this RAID level.
data for good performance and provides protection against drive failures. You
require a minimum of two drives for this RAID level.
against a single drive failure. Data and one strip of parity are stripped
across all array members. You require a minimum of three drives for this RAID
level and a maximum of 16 drives.
against two drive failures. Data and two strips of parity are stripped across
all array members. You require a minimum of five drives for this RAID level and
a maximum of 16 drives.
good performance and protects against at least one drive failure. All data is
mirrored on two array members. You require a minimum of two drives for this
RAID level and a maximum of 16 drives.