Related Topics; About Spares - HP P2000 G3 Reference Manual

• For maximum use of a dual-controller system's resources, each controller should own a similar number
of vdisks.
• Set the chunk size to match the transfer block size of the host application.

Related topics

• About RAID levels

• About spares

• About volumes
• Vdisk topics in
• Configuring a vdisk
• Verifying a vdisk
• Scrubbing a vdisk
• Viewing information about a vdisk
• Removing a vdisk from quarantine
About spares
A controller automatically reconstructs a redundant (fault-tolerant) vdisk (RAID 1, 3, 5, 6, 10, 50) when one
or more of its disks fails and a compatible spare disk is available. A compatible disk has enough capacity
to replace the failed disk and is the same type (SAS or SATA).
There are three types of spares:
• Dedicated spare. Reserved for use by a specific vdisk to replace a failed disk. Most secure way to
provide spares for vdisks but expensive to reserve a spare for each vdisk.
• Global spare. Reserved for use by any redundant vdisk to replace a failed disk.
• Dynamic spare. An available compatible disk that is automatically assigned to replace a failed disk in
a redundant vdisk.
When a disk fails, the system looks for a dedicated spare first. If it does not find a dedicated spare, it looks
for a global spare. If it does not find a compatible global spare and the dynamic spares option is enabled,
it takes any available compatible disk. If no compatible disk is available, reconstruction cannot start.
A best practice is to designate spares for use if disks fail. Dedicating spares to vdisks is the most secure
method, but it is also expensive to reserve spares for each vdisk. Alternatively, you can enable dynamic
spares or assign global spares.
Related topics
• Configuring dynamic spares
• Managing dedicated spares
• Managing global spares
• Using the Provisioning Wizard
• Creating a vdisk
• Viewing information about a vdisk
22 Getting started
on page 30
on page 22
on page 23
Provisioning the system
on page 55
on page 85
on page 85
(page
on page 86
on page 50
on page 55
on page 62
on page 59
on page 61
(page
on page 59
92), all vdisks (page
92) or all vdisks (page
91), or the system (page
91)
89)