Is it possible to replace the U320 controller(s) from an MSA20 with SAS/SATA controller(s) in order to attach the MSA20 to a SAS host adapter, like a P800 or P400 for example?
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MSA60s are dirt cheap on eBay - probably your best bet. – Chris S Apr 29 '13 at 17:16
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No. It's not possible.
The HP StorageWorks MSA20 is an Ultra 320 parallel SCSI-only device for its external interface. It's a SATA backplane... But remember, it's first-generation SATA; 1.5Gbps. Terrible.
If you want something compatible, you'll need an MSA50, MSA60, MSA70, D2600 or D2700... You get the idea. Something more modern.
Also see the advice given on your previous question: 3.5" SATAs in an HP DL580 G4
