[156418.468222] ata8: exception Emask 0x10 SAct 0x0 SErr 0x4050000 action 0xe frozen
[156418.468229] ata8: irq_stat 0x00000040, connection status changed
[156418.468238] ata8: SError: { PHYRdyChg CommWake DevExch }

(translation: SATA controller reports that a routine hotplug event took place)


[156418.468248] ata8: hard resetting link

(translation: reinitializing the link to detect the new state)


[156419.639804] ata8: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[156419.640116] ata8.15: Port Multiplier 1.2, 0x197b:0x575f r0, 15 ports, feat 0x5/0xf
[156419.642876] ata8.00: hard resetting link
[156420.120077] ata8.00: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[156420.120117] ata8.01: hard resetting link
[156420.596106] ata8.01: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[156420.596145] ata8.02: hard resetting link
[156421.072110] ata8.02: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[156421.072150] ata8.03: hard resetting link
[156421.548133] ata8.03: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[156421.548187] ata8.04: hard resetting link
[156421.864279] ata8.04: SATA link down (SStatus 0 SControl 330)
[156421.864338] ata8.05: hard resetting link
[156422.180286] ata8.05: SATA link down (SStatus 0 SControl 330)
[156422.180347] ata8.06: hard resetting link
[156422.496366] ata8.06: SATA link down (SStatus 0 SControl 330)
[156422.496425] ata8.07: hard resetting link
[156422.812324] ata8.07: SATA link down (SStatus 0 SControl 330)
[156422.812385] ata8.08: hard resetting link
[156423.128307] ata8.08: SATA link down (SStatus 0 SControl 330)
[156423.128368] ata8.09: hard resetting link
[156423.440261] ata8.09: SATA link down (SStatus 0 SControl 330)
[156423.440332] ata8.10: hard resetting link
[156423.752231] ata8.10: SATA link down (SStatus 0 SControl 330)
[156423.752292] ata8.11: hard resetting link
[156424.068483] ata8.11: SATA link down (SStatus 0 SControl 330)
[156424.068555] ata8.12: hard resetting link
[156424.384240] ata8.12: SATA link down (SStatus 0 SControl 330)
[156424.384307] ata8.13: hard resetting link
[156424.700327] ata8.13: SATA link down (SStatus 0 SControl 330)
[156424.700386] ata8.14: hard resetting link
[156425.016375] ata8.14: SATA link down (SStatus 0 SControl 330)

(translation: we see a port multiplier now; ports 00-03 have a device in them, ports 04-15 don't)


[156425.017056] ata8.00: ATA-10: WDC WD40EFRX-68N32N0, 82.00A82, max UDMA/133
[156425.017060] ata8.00: 7814037168 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
[156425.017586] ata8.00: configured for UDMA/133
[156425.018162] ata8.01: ATA-10: WDC WD40EFRX-68N32N0, 82.00A82, max UDMA/133
[156425.018165] ata8.01: 7814037168 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
[156425.018754] ata8.01: configured for UDMA/133
[156425.019349] ata8.02: ATA-10: WDC WD40EFRX-68N32N0, 82.00A82, max UDMA/133
[156425.019352] ata8.02: 7814037168 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
[156425.019920] ata8.02: configured for UDMA/133
[156425.020496] ata8.03: ATA-10: WDC WD40EFRX-68N32N0, 82.00A82, max UDMA/133
[156425.020499] ata8.03: 7814037168 sectors, multi 16: LBA48 NCQ (depth 31/32), AA
[156425.021012] ata8.03: configured for UDMA/133
[156425.021084] ata8: EH complete

(translation: we configured the four devices)