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Mapping Linux kernel ATA errors to a device

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I found it quite difficult to map Linux kernel ATA warnings to a particular device. These article gives some insights.

I have a dying drive in my system and I'm getting Linux kernel warnings like those ones:

[ 3180.294013] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[ 3180.316290] ata6.00: configured for UDMA/33
[ 3180.316294] ata6: EH complete
[ 3180.547232] ata6: exception Emask 0x50 SAct 0x0 SErr 0x90800 action 0xe frozen
[ 3180.547234] ata6: irq_stat 0x00400000, PHY RDY changed
[ 3180.547238] ata6: SError: { HostInt PHYRdyChg 10B8B }
[ 3180.547244] ata6: hard resetting link
[ 3182.698012] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 310)
[ 3182.736664] ata6.00: configured for UDMA/33
[ 3182.736667] ata6: EH complete
[ 3182.864164] ata6.00: exception Emask 0x50 SAct 0x1 SErr 0x90800 action 0xe frozen
[ 3182.864167] ata6.00: irq_stat 0x00400000, PHY RDY changed
[ 3182.864170] ata6: SError: { HostInt PHYRdyChg 10B8B }
[ 3182.864173] ata6.00: failed command: READ FPDMA QUEUED
[ 3182.864179] ata6.00: cmd 60/cutout/00:00:02:00:00/40 tag 0 ncq 4096 in
[ 3182.864181]          res 40/cutout/00:00:02:00:00/40 Emask 0x50 (ATA bus error)
[ 3182.864183] ata6.00: status: { DRDY }
[ 3182.864189] ata6: hard resetting link
To figure out who is ata6 I had to look at my drives in the /sys file-system:
dirk@topo ~ $ ls -l /sys/block/sd{a,b,c,d}
lrwxrwxrwx 1 root root 0 Apr  9 01:24 /sys/block/sda -> ../devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0/block/sda
lrwxrwxrwx 1 root root 0 Apr  9 01:24 /sys/block/sdb -> ../devices/pci0000:00/0000:00:1f.2/host1/target1:0:0/1:0:0:0/block/sdb
lrwxrwxrwx 1 root root 0 Apr  9 01:24 /sys/block/sdc -> ../devices/pci0000:00/0000:00:1f.2/host4/target4:0:0/4:0:0:0/block/sdc
lrwxrwxrwx 1 root root 0 Apr  9 01:24 /sys/block/sdd -> ../devices/pci0000:00/0000:00:1f.2/host5/target5:0:0/5:0:0:0/block/sdd

On PCI bus 1, PCI device 00:1f.2 is my SATA controller, a Intel Corporation 82801HB (ICH8) 4 port SATA AHCI Controller (rev 02). It provides 4 hosts to each of which I have attached a disk.

To get that ID, Instead of looking into the target structure, we're looking into the scsi_host structure. It has a directory for the host and in it a file unique_id. That's the ID appended to ata.

So for each of the hosts above I can display the ID like this:

dirk@topo ~ $ for host in 0 1 4 5; do echo -n host${host}:; cat /sys/devices/pci0000:00/0000:00:1f.2/host${host}/scsi_host/host${host}/unique_id; done
host0:1
host1:2
host4:5
host5:6

So going back to where we came, ata6 is host5, which hosts sdd.

 

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