On 9/11/2019 4:16 AM, Martin K. Petersen wrote:
Max,
I guess Type 1 and Type 3 mirrors can work because Type 3 doesn't have
a ref tag, right ?
It will work but you'll lose ref tag checking on the Type 3 side of the
mirror. So not exactly desirable. And in our experience, the ref tag is
hugely important.
Also, there are probably some headaches lurking in the slightly
different app/ref tag escape handling if you mix the two
formats. Whereas Type 1 and 2 are 100% identical in behavior if you use
the LBA as the ref tag.
Anyway. So my take on all this is that the T10-DIF-TYPE1-CRC profile is
"it" and everything else is legacy.
do you see any reason to support the broken type 3 ?
Only to support existing installations. We can't really remove it
without the risk of breaking something for somebody out there.
what about broken type 3 in the NVMe spec ?
I don't really know what is broken there but maybe we can avoid
supporting it for NVMe until it's fixed.
