After few suspend/resume cycles one of my hdd disappears from the list of devices, here is part of
dmesg output that seems to be related to issue:
[ 450.005310] sd 5:0:0:0: [sdc] Starting disk [ 451.754602] ata6.00: detaching (SCSI 5:0:0:0) [ 451.755862] sd 5:0:0:0: [sdc] Stopping disk [ 451.993621] ata6: SATA link up 6.0 Gbps (SStatus 133 SControl 300) [ 451.993682] sd 5:0:0:0: [sdc] Start/Stop Unit failed: Result: hostbyte=0x04 driverbyte=0x00
Device itself should be fine, Ubuntu worked there for few weeks, problem occurred after installing Gentoo on other drive and using this as a storage. Looks like there is some timeout in the kernel for device init process and it's just not enough for this slow disk.
Issue was reproduced with 2 different kernels: 4.1.15, 4.4.1 built from gentoo-sources package.
Linux distribuion: Gentoo
Tried rescan after losing disk with
echo "- - -" > /sys/class/scsi_host/host5/scan
And my disk is back again
[ 1517.414376] ata6: hard resetting link [ 1517.718490] ata6: SATA link up 1.5 Gbps (SStatus 113 SControl 310) [ 1517.722674] ata6.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded [ 1517.722677] ata6.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out [ 1518.140312] ata6.00: ATA-8: TOSHIBA MQ01ABD100, AX0P8E, max UDMA/100 [ 1518.140316] ata6.00: 1953525168 sectors, multi 16: LBA48 NCQ (depth 31/32), AA [ 1518.142307] ata6.00: ACPI cmd ef/02:00:00:00:00:a0 (SET FEATURES) succeeded [ 1518.142310] ata6.00: ACPI cmd f5/00:00:00:00:00:a0 (SECURITY FREEZE LOCK) filtered out [ 1518.143854] ata6.00: configured for UDMA/100 [ 1518.143861] ata6: EH complete [ 1518.144170] scsi 5:0:0:0: Direct-Access ATA TOSHIBA MQ01ABD1 8E PQ: 0 ANSI: 5 [ 1518.144301] sd 5:0:0:0: [sdc] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB) [ 1518.144304] sd 5:0:0:0: [sdc] 4096-byte physical blocks [ 1518.144334] sd 5:0:0:0: Attached scsi generic sg2 type 0 [ 1518.144350] sd 5:0:0:0: [sdc] Write Protect is off [ 1518.144354] sd 5:0:0:0: [sdc] Mode Sense: 00 3a 00 00 [ 1518.144387] sd 5:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA [ 1518.175044] sdc: sdc1 [ 1518.175497] sd 5:0:0:0: [sdc] Attached SCSI removable disk
So at least I have workaround, still hope to find a better soluiton.