Mixing Drive Types In Raid Groups; Raid Controller Migration - Cisco SE-CL-L3 Installation Manual

Storage Controller Considerations
The write policy can be set to Write Back, if preferred. You can set the write policy using the following
methods:
• For standalone servers, use the Cisco IMC interface to set Virtual Drive Properties > Write Policy. See
• For Cisco UCS-integrated servers, use the Cisco UCS Manager interface to set the write-cache policy
• Use the LSI Option ROM Configuration Utility.

Mixing Drive Types in RAID Groups

The following table lists the technical capabilities for mixing hard disk drive (HDD) and solid state drive
(SSD) types in a RAID group. However, see the recommendations that follow for the best performance.
Table 12: Mixing Drive Types
Mix of Drive Types in RAID Group
SAS HDD + SATA HDD
SAS SSD + SATA SSD
HDD + SSD
Drive Type Mixing Best Practices
For the best performance follow these guidelines:
• Use either all SAS or all SATA drives in a RAID group.
• Use the same capacity for each drive in the RAID group.
• Never mix HDDs and SSDs in the same RAID group.

RAID Controller Migration

This server supports SAS/SATA hardware RAID (controller card) and embedded software SATA RAID. You
cannot use hardware RAID and software RAID at the same time. See the table below for which data migrations
are allowed and a summary of migration steps.
Starting RAID Controller
the "Managing Storage Adapters" section in your Cisco IMC Configuration Guide.
Cisco IMC GUI and CLI Configuration Guides
as part of virtual drive configuration in your storage profile.
Cisco UCS Manager Configuration Guides
Allowed?
Yes
Yes
No
Migrate to Hardware RAID Allowed?
Cisco Application Services Engine Hardware Installation Guide

Mixing Drive Types in RAID Groups

Migrate to Software RAID
Allowed?
93