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
the “Managing Storage Adapters” section in your Cisco IMC Configuration Guide.
Cisco IMC GUI and CLI Configuration Guides
• For Cisco UCS-integrated servers, use the Cisco UCS Manager interface to set the write-cache policy
as part of virtual drive configuration in your storage profile.
Cisco UCS Manager Configuration Guides
• 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
Allowed?Mix of Drive Types in RAID Group
YesSAS HDD + SATA HDD
YesSAS SSD + SATA SSD
NoHDD + 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.
Migrate to Software RAID
Allowed?
Migrate to Hardware RAID Allowed?Starting RAID Controller
Cisco Application Services Engine Hardware Installation Guide
93
Storage Controller Considerations
Mixing Drive Types in RAID Groups
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