IBM SAS RAID 5, Manual

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SSD and HDD use
Follow these guidelines when using SSDs and HHDs.
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Do not mix SSDs and HDDs within the same disk array. A disk array must only contain SSDs or
HDDs.
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Do not mix SSDs and HDDs with system mirroring in the same mirrored pair. A mirrored pair must
only contain SSDs or HDDs.
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It is important to plan for hot-spare devices when you use arrays of SSDs. An SSD hot-spare device
replaces a failed device in an SSD disk array. An HDD hot-spare device replaces a failed device for an
HDD disk array.
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It is recommended that SSDs be protected by RAID 5, RAID 6, or by system mirroring.
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See Installing and configuring Solid State Drives to identify specific configuration and placement
requirements related to the SSD devices.
Related information
Installing and configuring Solid State Drives
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SAS RAID controllers for IBM i