Date: Tue, 18 Mar 2014 10:36:40 -0000 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Borja Marcos" <borjam@sarenet.es>, <freebsd-scsi@freebsd.org> Subject: Re: SATA on SAS and tags Message-ID: <1B1689B9E3D94E45963FBE018E25CD64@multiplay.co.uk> References: <4C5437F0-E612-4907-8D52-6FCB15CC78E1@sarenet.es>
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mps presents its devices as SCSI devices not ATA, using firmware based translation,
so thats actually expected.
Regards
Steve
----- Original Message -----
From: "Borja Marcos" <borjam@sarenet.es>
To: <freebsd-scsi@freebsd.org>
Sent: Tuesday, March 18, 2014 10:01 AM
Subject: SATA on SAS and tags
>
> Hello,
>
> I guess this is a bug. I am using SATA SSDs connecting to a SAS backplane and SAS controller (LSI2008, IT firmware, mps driver)
> and I've just noticed that CAM claims a maximum of 255 tags.
>
> Shouldn't it be 16 using NCQ instead of TCQ?
>
>
> mps0: <LSI SAS2008> port 0xfc00-0xfcff mem 0xdf2b0000-0xdf2bffff,0xdf2c0000-0xdf2fffff irq 32 at device 0.0 on pci2
> mps0: Firmware: 18.00.00.00, Driver: 16.00.00.00-fbsd
> mps0: IOCCapabilities: 1285c<ScsiTaskFull,DiagTrace,SnapBuf,EEDP,TransRetry,EventReplay,HostDisc>
>
> camcontrol devlist
> # camcontrol devlist
> <SEAGATE ST9146803SS FS64> at scbus0 target 8 lun 0 (pass0,da0)
> <SEAGATE ST9146803SS FS64> at scbus0 target 9 lun 0 (pass1,da1)
> <ATA Samsung SSD 840 BB0Q> at scbus0 target 10 lun 0 (da2,pass2)
> <ATA Samsung SSD 840 AB0Q> at scbus0 target 11 lun 0 (da3,pass3)
> <ATA Samsung SSD 840 BB0Q> at scbus0 target 12 lun 0 (da4,pass4)
> <ATA Samsung SSD 840 BB0Q> at scbus0 target 13 lun 0 (pass5,da5)
> <ATA Samsung SSD 840 BB0Q> at scbus0 target 14 lun 0 (da6,pass6)
> <ATA Samsung SSD 840 BB0Q> at scbus0 target 15 lun 0 (da7,pass7)
> <ATA Samsung SSD 840 AB0Q> at scbus0 target 17 lun 0 (da8,pass8)
> <ATA Samsung SSD 840 BB0Q> at scbus0 target 18 lun 0 (da9,pass9)
> <ATA Samsung SSD 840 AB0Q> at scbus0 target 19 lun 0 (da10,pass10)
> <ATA Samsung SSD 840 AB0Q> at scbus0 target 20 lun 0 (da11,pass11)
> <ATA Samsung SSD 840 BB0Q> at scbus0 target 21 lun 0 (da12,pass12)
> <ATA Samsung SSD 840 BB0Q> at scbus0 target 25 lun 0 (da13,pass13)
>
>
> # camcontrol tags da10 -v
> (pass10:mps0:0:19:0): dev_openings 255
> (pass10:mps0:0:19:0): dev_active 0
> (pass10:mps0:0:19:0): devq_openings 255
> (pass10:mps0:0:19:0): devq_queued 0
> (pass10:mps0:0:19:0): held -63
> (pass10:mps0:0:19:0): mintags 2
> (pass10:mps0:0:19:0): maxtags 255
>
>
> Thanks!
>
>
>
>
>
> Borja.
>
>
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