Raid Devices By Raid Type; Virtual Raid Devices; Planning The Raid Configuration; Data Protection - HP StoreVirtual 4000 User Manual

RAID devices by RAID type

Each RAID type creates different sets of RAID devices.
of the variety of RAID devices created by the different RAID types as implemented on various
storage systems.
Table 7 Information in the RAID setup report
This item
Device Name
Device Type
Device Status
Subdevices

Virtual RAID devices

If you are using the VSA, the only RAID available is virtual RAID. After installing the VSA, virtual
RAID is configured automatically if you first configured the data disk in the VI Client.
HP recommends installing VSA for vSphere on top of a server with a RAID 5 or RAID 6 configuration.

Planning the RAID configuration

Plan the RAID configuration for storage systems based on a balance between data high availability
or fault tolerance, I/O performance, and usable capacity.
CAUTION:
change the RAID configuration without deleting all data on the storage system.

Data protection

Keeping multiple copies of your data ensures that data is safe and remains available in the case
of disk failure. HP recommends using both disk RAID and Network RAID to insure high availability:
Configure RAID 1, RAID 10, RAID 5, or RAID 6 within each storage system to ensure data
redundancy.
Always use Network RAID to mirror data volumes across storage systems in a cluster, regardless
of RAID level, for added data protection and high availability .

Using RAID for data redundancy

Within each storage system, RAID 1 or RAID 10 ensures that two copies of all data exist. If one
of the disks in a RAID pair goes down, data reads and writes continue on the other disk. Similarly,
RAID 5 or RAID 6 provides redundancy by spreading parity evenly across the disks in the set.
If one disk in a RAID 5 set, or two disks in a RAID 6 set goes down, data reads and writes continue
on the remaining disks in the set.
RAID protects against failure of disks within a storage system, but not against failure of an entire
storage system. For example, if network connectivity to the storage system is lost, then data reads
and writes to the storage system cannot continue.
30 Configuring RAID and Managing Disks
Plan your RAID configuration carefully. After you have configured RAID, you cannot
Table 7 (page 30)
Describes this
The disk sets used in RAID. The number and names of
devices varies by storage system and RAID level.
The RAID level of the device. For example, in a HP P4300
G2, RAID 5 displays a Device Type of RAID 5 and
subdevices as 8.
The RAID status of the device.
Status is one of the following:
Normal—green
Degraded—yellow
Off—red
Rebuilding—blue
The number of disks included in the device.
contains a description