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SATA speed

B

bjlockie

Member
ata1.00: ATA-6: ST3120827AS, 3.42, max UDMA/133
ata1.00: 234441648 sectors, multi 16: LBA48 NCQ (depth 0/32)
ata1.00: configured for UDMA/133

ata3.00: ATA-7: SAMSUNG SP2504C, VT100-33, max UDMA7
ata3.00: 488397168 sectors, multi 16: LBA48 NCQ (depth 0/32)
ata3.00: configured for UDMA/133

Does that imply I can make the Samsung go faster?
 
Only if the controller can do UDMA7 - they have to be a team. And, they can't be in a RAID array - because the array has to be a team.
 
No you can't. The "UDMA mode" is entirely meaningless on a SATA drive, it's just there so that legacy software doesn't get confused - exactly as shown in your system log snippet, in fact. Your 'ata' driver thinks it needs to configure a DMA mode, and given the bogus data, it can - but it does nothing to the actual mode of operation on the SATA cable.

What will actually do something is updating your Linux to have 'ata' drivers that use NCQ.
 
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