What's happening here? Suddenly, my backup server is suffering apparently spurious hard drive convictions. The server is running RAID5 on 7 disks under md. It has been running well for months, but suddenly it has started kicking drives from the array when under moderately heavy read or write loads. The thing is, it isn't convicting any particular drive repeatedly, and the drives are not showing any errors under SMART. This is a PM system, and I have tried changing the drive adapters, changing the PMs, changing cables, moving the drives around, and moving them out of the CPU enclosure to a new external chassis. The convictions are not occurring on any one channel, over any one particular PM, or over any particular cable. Since this started happening, I have been unable to get all the way through a resync before the array dumps at least one of the drives. Here is a sample from the kernel log during one of the convictions:
Dec 12 13:03:39 Backup kernel: [56319.397992] ata6.00: failed to read SCR 1 (Emask=0x40) Dec 12 13:03:39 Backup kernel: [56319.397999] ata6.01: failed to read SCR 1 (Emask=0x40) Dec 12 13:03:39 Backup kernel: [56319.398001] ata6.02: failed to read SCR 1 (Emask=0x40) Dec 12 13:03:39 Backup kernel: [56319.398006] ata6.03: failed to read SCR 1 (Emask=0x40) Dec 12 13:03:39 Backup kernel: [56319.398008] ata6.04: failed to read SCR 1 (Emask=0x40) Dec 12 13:03:39 Backup kernel: [56319.398010] ata6.05: failed to read SCR 1 (Emask=0x40) Dec 12 13:03:39 Backup kernel: [56319.398014] ata6.15: exception Emask 0x4 SAct 0x0 SErr 0x0 action 0x6 frozen Dec 12 13:03:39 Backup kernel: [56319.398018] ata6.00: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen Dec 12 13:03:39 Backup kernel: [56319.398022] ata6.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 2
Dec 12 13:03:39 Backup kernel: [56319.398023] res 40/00:00:00:00:00/00:00:00:00:00/00 Emask 0x4 (timeout)
Dec 12 13:03:39 Backup kernel: [56319.398025] ata6.00: status: { DRDY } Dec 12 13:03:39 Backup kernel: [56319.398028] ata6.01: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen Dec 12 13:03:39 Backup kernel: [56319.398031] ata6.02: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen Dec 12 13:03:39 Backup kernel: [56319.398034] ata6.03: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen Dec 12 13:03:39 Backup kernel: [56319.398037] ata6.04: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen Dec 12 13:03:39 Backup kernel: [56319.398040] ata6.05: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen Dec 12 13:03:39 Backup kernel: [56319.398044] ata6.15: hard resetting link Dec 12 13:03:41 Backup kernel: [56321.597384] ata6.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0) Dec 12 13:03:41 Backup kernel: [56321.597864] ata6.00: hard resetting link Dec 12 13:03:42 Backup kernel: [56321.933843] ata6.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320) Dec 12 13:03:42 Backup kernel: [56321.933849] ata6.01: hard resetting link Dec 12 13:03:42 Backup kernel: [56322.294048] ata6.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Dec 12 13:03:42 Backup kernel: [56322.294055] ata6.02: hard resetting link Dec 12 13:03:42 Backup kernel: [56322.642243] ata6.02: SATA link down (SStatus 0 SControl 320) Dec 12 13:03:42 Backup kernel: [56322.646087] ata6.03: hard resetting link Dec 12 13:03:43 Backup kernel: [56323.006393] ata6.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300) Dec 12 13:03:43 Backup kernel: [56323.006400] ata6.04: hard resetting link Dec 12 13:03:43 Backup kernel: [56323.354708] ata6.04: SATA link up 1.5 Gbps (SStatus 113 SControl 300) Dec 12 13:03:43 Backup kernel: [56323.354714] ata6.05: hard resetting link Dec 12 13:03:43 Backup kernel: [56323.690211] ata6.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320) Dec 12 13:03:43 Backup kernel: [56323.694555] ata6.00: configured for UDMA/100 Dec 12 13:03:43 Backup kernel: [56323.695732] ata6.01: configured for UDMA/100 Dec 12 13:
03:44 Backup kernel: [56323.703212] ata6.03: configured for UDMA/100 Dec 12 13:03:44 Backup kernel: [56323.803119] ata6.04: configured for UDMA/100 Dec 12 13:03:44 Backup kernel: [56323.803188] ata6: EH complete Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:0:0:0: [sde] 2930277168 512-byte hardware sectors (1500302 MB) Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:0:0:0: [sde] Write Protect is off Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:0:0:0: [sde] Mode Sense: 00 3a 00 00 Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:1:0:0: [sdf] 2930277168 512-byte hardware sectors (1500302 MB) Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:1:0:0: [sdf] Write Protect is off Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:1:0:0: [sdf] Mode Sense: 00 3a 00 00 Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:1:0:0: [sdf] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:3:0:0: [sdg] 2930277168 512-byte hardware sectors (1500302 MB) Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:3:0:0: [sdg] Write Protect is off Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:3:0:0: [sdg] Mode Sense: 00 3a 00 00 Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:3:0:0: [sdg] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:4:0:0: [sdh] 625142448 512-byte hardware sectors (320073 MB) Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:4:0:0: [sdh] Write Protect is off Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:4:0:0: [sdh] Mode Sense: 00 3a 00 00 Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:4:0:0: [sdh] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:0:0:0: [sde] 2930277168 512-byte hardware sectors (1500302 MB) Dec 12 13:03:44 Backup kernel: [56323.8
03119] sd 5:0:0:0: [sde] Write Protect is off Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:0:0:0: [sde] Mode Sense: 00 3a 00 00 Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:0:0:0: [sde] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:1:0:0: [sdf] 2930277168 512-byte hardware sectors (1500302 MB) Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:1:0:0: [sdf] Write Protect is off Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:1:0:0: [sdf] Mode Sense: 00 3a 00 00 Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:1:0:0: [sdf] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:3:0:0: [sdg] 2930277168 512-byte hardware sectors (1500302 MB) Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:3:0:0: [sdg] Write Protect is off Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:3:0:0: [sdg] Mode Sense: 00 3a 00 00 Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:3:0:0: [sdg] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:4:0:0: [sdh] 625142448 512-byte hardware sectors (320073 MB) Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:4:0:0: [sdh] Write Protect is off Dec 12 13:03:44 Backup kernel: [56323.803119] sd 5:4:0:0: [sdh] Mode Sense: 00 3a 00 00 Dec 12 13:03:44 Backup kernel: [56323.807115] sd 5:4:0:0: [sdh] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA Dec 12 13:03:44 Backup kernel: [56323.839100] end_request: I/O error, dev sde, sector 10 Dec 12 13:03:44 Backup kernel: [56323.839100] md: super_written gets error=-5, uptodate=0 Dec 12 13:03:44 Backup kernel: [56323.839100] raid5: Disk failure on sde, disabling device.
Dec 12 13:03:44 Backup kernel: [56323.839100] raid5: Operation continuing on 6 devices.
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