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The customer had a mix of SSD and Spinny disk. AT THE TIME ONLY VIOS
could tell IBM i that the hosted disks were SSD so unless we wanted to
play with iASPS etc that was the only way to leverage the SSDs with the
UNIT parm on objects.
By the time we tilled VIOS under and replanted with IBM i it was
supported in IBM i as well so by then a clear no-brainer.
Also note that the big performance hit wasn't on all storage it was
primarily if you had 2780 and the like which were at the time the
max-hustle RAID cards. That has long been corrected in VIOS as well.
- DrF
On 3/25/2021 6:40 AM, Rob Berendt wrote:
It was a good long term corrective action anyway.
Why anyone would host internal disk to IBM i via vios escapes me. It's a real performance hit.
Unless they wanted multiple lpars, shared resources and no expansion units. We always put our IBM i disk in expansion units and the CEC is reserved for VIOS disks.
Rob Berendt
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