Dell PowerEdge RAID Controller S110 - Manual (Page 14)

12 Features
If a physical disk in RAID 5 fails, parity data exists on the remaining physical
disks, which can be used to restore the data to a new replacement physical
disk configured as a hot spare.
If a physical disk fails in RAID 10, the virtual disk remains functional and data
is read from the surviving mirrored physical disk(s). A single disk failure in
each mirrored set can be sustained, depending on how the mirrored set fails.
Mirror Rebuilding
A RAID mirror configuration can be rebuilt after a new physical disk is
inserted and the physical disk is designated as a hot spare. The system does
not have to be rebooted.
Online Capacity Expansion/Reconfigure (OCE/Reconfigure)
OCE/Reconfigure is a process that allows you to add storage capacity to an
existing virtual disk. In most cases additional storage capacity can be added
without taking the system offline. However, if an additional physical disk
needs to be added and the system does not support hot-swapping, the system
must be turned off.
OCE/Reconfigure enables you to increase the total storage capacity of a
virtual disk by integrating unused storage with the virtual disk.
Data can be accessed while the physical disks are added (if a system has hot-
swap capability) and while data on the virtual disk is being redistributed.
For volume and RAID 1, OCE/Reconfigure expands the virtual disk by using
the available space of the physical disks that are already members of the
virtual disk. For RAID 0, RAID 5 and RAID 10, additional capacity can be
attained by adding physical disks to the virtual disk.
Physical Disks (General)
The PERC S110 supports up to four SATA HDD or SSD physical disks.
NOTE: The physical disks in a virtual disk must be the same interface and drive
type (HDD or SSD). For example, you cannot mix a HDD and SSD physical disk, in the
same virtual disk.
A maximum of four physical disks can be used for RAID 0 and RAID 5. A
maximum of two physical disks can be used for RAID 1. A maximum of four
physical disks can be used for RAID 10.
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