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MegaRAID SAS Software User GuideChapter 1: Overview
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1.7.1 Valid Drive Mix Configurations
with HDDs and CacheCade – SSD
Caching software
You can allow a virtual drive to consist of both CacheCade – SSD Caching software and
HDDs. For virtual drives that have both CacheCade – SSD Caching software and HDDs,
you can choose whether to mix SAS drives and SATA drives on the CacheCade – SSD
Caching software devices.
You can choose whether to allow a virtual drive to consist of both CacheCade – SSD
Caching software devices and HDDs. For a virtual drive that consists of CacheCade –
SSD Caching software only, you can choose whether to allow SAS CacheCade – SSD
Caching software drives and SATA CacheCade – SSD Caching software drives in that
virtual drive. For virtual drives that have both CacheCade – SSD Caching software and
HDDs, you can choose whether to mix SAS and SATA HDD drives with SAS and SATA
CacheCade – SSD Caching software devices in various combinations.
Table1 lists the valid drive mix configurations you can use when you create virtual
drives and allow HDD and CacheCade – SSD Caching software mixing. The valid drive
mix configurations are based on manufacturer settings.
NOTE: Only one of the valid configurations listed in Table1 is allowed based on your
controller card manufacturing settings.
NOTE: The valid drive mix also applies to hot spares. For hot spare information, see
Section2.4.12, Hot Spares, on page28.
Table 1: Valid Drive Mix Configurations
# Valid Drive Mix Configurations
1. SAS HDD with SAS SDD (SAS-only configuration)
2. SATA HDD with SATA CacheCade – SSD Caching software (SATA-only configuration)
3. SAS HDD with a mix of SAS and SATA CacheCade – SSD Caching software (a SATA HDD
cannot be added)
4. SATA HDD with a mix of SAS and SATA CacheCade – SSD Caching software (a SAS HDD
cannot be added)
5. SAS CacheCade – SSD Caching software with a mix of SAS and SATA HDD (a SATA
CacheCade – SSD Caching software cannot be added)
6. SATA CacheCade – SSD Caching software with a mix of SAS and SATA HDD (a SAS
CacheCade – SSD Caching software cannot be added)
7. A mix of SAS and SATA HDD with a mix of SAS and SATA CacheCade – SSD Caching
software
8. A CacheCade – SSD Caching software cannot be added to a HDD, but a SAS/SATA mix is
allowed.