What will be the negotiated speed if I mix 6 and 12gbps SATA and SAS drives in a single h/w RAID controller, but keep them in the separate raid groups? Let's take LSI (Dell PERC H730) as an example with 2 x SATA @6Gbps in RAID1 and 2 x SAS @12Gbps in RAID1 in another. Will the SAS disks negotiate to their max of 12 or step down to 6?
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Link speed negotiation is done on a per-port basis, so it should be possible to have SATA 3.0 (6 Gb/s) and SAS 3.0 (12 Gb/s) connected to the same PERC card at maximum speed.
However, you can not (and should not) mix them in the same virtual disk / array. In other words, keep them in separate array and all should works without issues.
From PERC H730 manual:
Combining SAS and SATA hard drives within a virtual disk is not supported. Also, combining hard drives and solid state drives (SSDs) within a virtual disk is not supported
No similar statements is done for mixing SATA 3.0 and 6.0 Gpbs drives, and omreport storage pdisk controller=0 reports link speed on a per-drive basis.
shodanshok
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Thank you for the answer. Do you happen to have any reference to a documentation to support this? – Lubos A. Jun 15 '20 at 23:39
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@LubosA.I've updated my answer – shodanshok Jun 16 '20 at 12:04