2011/7/14 Peter Hamilton <peterghamilton@xxxxxxxxx>: > I'm trying to find out what the negotiated speed is on a SATA port. dmesg > reports the negotiated speed, but I'm hoping to find it somewhere in /sys or > /proc (or some other tool). Scraping dmesg is a messy process as I'm > starting with a block device. I would have to trace the block device to the > scsi address and translate that to an ata address. > Here's the scsi and block device info from dmesg: > > scsi 7:0:0:0: Direct-Access ATA WDC WD1600AAJS-2 01.0 PQ: 0 ANSI: 5 > sd 7:0:0:0: [sdd] 312581808 512-byte logical blocks: (160 GB/149 GiB) > sd 7:0:0:0: [sdd] Write Protect is off > sd 7:0:0:0: [sdd] Mode Sense: 00 3a 00 00 > sd 7:0:0:0: [sdd] Write cache: enabled, read cache: enabled, doesn't support > DPO or FUA > sd 7:0:0:0: [sdd] Attached SCSI disk > sd 7:0:0:0: Attached scsi generic sg3 type 0 > Here's the corresponding ata info from dmesg: > ata7: SATA link up 3.0 Gbps (SStatus 123 SControl 370) > ata7.00: ATA-8: WDC WD1600AAJS-22L7A0, 01.03E01, max UDMA/133 > ata7.00: 312581808 sectors, multi 0: LBA48 NCQ (depth 31/32), AA > ata7.00: configured for UDMA/133 > > > > Finding the SATA link speed in dmesg would be much cleaner than scraping > dmesg. Does anyone know where I might find that? > Also, for a SAS HBA, the link speed is not reported to dmesg. Does anyone > know how to find the link speed for a SAS drive? > Thanks, > Peter Take a look at /sys/class/ata_link/linkX/sata_spd Where X should be the number of your SATA port. There probabably exists something equivalent for SAS but I don't have a controller so I can't tell for sure. Mirco _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
