For the last couple of months I have been noticing very bad write-performance in the term of IOPS through my BPN-SAS2-216EL (featuring LSI SAS2X36 expander) backplane.
This is a screenshot from Anvil's Storage Utilities using an Intel 520 120GiB SSD and an old LSI SAS-1068E (Dell SAS 6/iR) connected to the backplane:
Connected to a more modern LSI 9307-8i HBA the values are roughly the same (in the margin of error) and this points me in the direction that the backplane is the culprit:
Compare this to the same disk connected to the onbard controller:
Should I really be worried about this or is there some kind of magic happening in the SAS expander that I'm unaware of?
This is a screenshot from Anvil's Storage Utilities using an Intel 520 120GiB SSD and an old LSI SAS-1068E (Dell SAS 6/iR) connected to the backplane:
Connected to a more modern LSI 9307-8i HBA the values are roughly the same (in the margin of error) and this points me in the direction that the backplane is the culprit:
Compare this to the same disk connected to the onbard controller:
Should I really be worried about this or is there some kind of magic happening in the SAS expander that I'm unaware of?
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