Users Guide

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.
NOTE: The system does not have to be rebooted.
Fault tolerance
The following fault tolerance features are available with the PERC S140:
● Physical disk failure detection (automatic).
● Virtual disk rebuild using hot spares (automatic, if the hot spare is configured for this feature).
● Parity generation and checking (RAID 5 only).
● Hot-swap manual replacement of a physical disk without rebooting the system (only for systems with a backplane that
allows hot-swapping).
If one side of a RAID 1 (mirror) fails, data can be rebuilt by using the physical disk on the other side of the mirror.
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.
Self-Monitoring And Reporting Technology
The Self-Monitoring and Reporting Technology (SMART) feature monitors certain physical aspects of all motors, heads, and
physical disk electronics to help detect predictable physical disk failures. Data on SMART compliant physical disks can be
monitored to identify changes in values and determine whether the values are within threshold limits. Many mechanical and
electrical failures display some degradation in performance before failure.
A SMART failure is also referred to as a predicted failure. There are numerous factors that are predicted physical disk failures,
such as a bearing failure, a broken read/write head, and changes in spin-up rate. In addition, there are factors related to read/
write surface failure, such as seek error rate and excessive bad sectors.
NOTE:
For detailed information on SCSI interface specifications, see t10.org, and for detailed information on SATA
interface specifications, see t13.org.
Native Command Queuing
Native Command Queuing (NCQ) is a command protocol used by SATA physical disks supported on the S140 controller. NCQ
allows the host to provide multiple input/output requests to a disk simultaneously. The disk decides the order to process the
commands to achieve maximum performance.
NVMe PCIe SSD support
S140 supports the NVMe PCIe SSD-including the NVMe PCIe SSD 2.5-inch Small Form Factor (SFF) and NVMe PCIe SSD
Adapter.
The S140 allows the NVMe PCIe SSD 2.5 inch SFF and the NVMe PCIe SSD adapter in a RAID configuration. The NVMe PCIe
SSDs supports volume, RAID 0, RAID 1, RAID 5, and RAID 10. S140 also supports Prepare to remove feature to remove Non-
RAID NVMe volume from the Dell EMC open manage console.
NOTE:
Recommended minimum version to support the NVMe drives is listed below.
Drives S140 operating system driver S140 UEFI driver
Samsung PM1733/PM1735 5.5.2.0008 5.5.2.0006
Intel P5500/P5600 5.5.2.0008 5.5.2.0006
Physical Disks 13