high iowait (100%) on SATA disks
We just put up a new machine with 3 SATA disks. The first one is doing fine.
We had to use sata_sil, so they show up as scsi devices:
$ cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: Maxtor 6Y080M0 Rev: YAR5
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: HDS724040KLSA80 Rev: KFAO
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi2 Channel: 00 Id: 00 Lun: 00
Vendor: ATA Model: HDS724040KLSA80 Rev: KFAO
Type: Direct-Access ANSI SCSI revision: 05
The other two ones show all problems. I first thought they were broken disks
(which is still a possibility). I checked them with badblocks. sdb gets stuck
at some point and stops responding. sdc gets through but takes ages. Is this
normal - they are 400G disks. I have turned my attention to sdc, after sdb
segfaulted a cp with huge amounts of data. I noticed that even accesing the
better one, sdc, causes the iowait to go up to 100% for longer periods of
time.
This is on a stock debian kernel 2.6.11-1-686 (apparently I should be using a
smp kernel for hyperthreading support - would this make any difference?).
Has anyone seem anything similiar, hints? I'm running out of ideas but find it
strange that both disks should be broken.
Thanks,
mimo
Some more info
lspci
00:00.0 Host bridge: Intel Corp.: Unknown device 254c (rev 01)
00:00.1 Class ff00: Intel Corp. e7500 [Plumas] DRAM Controller Error Reporting
(rev 01)
00:02.0 PCI bridge: Intel Corp. e7500 [Plumas] HI_B Virtual PCI Bridge (F0)
(rev 01)
00:1d.0 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #1) (rev 02)
00:1d.1 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #2) (rev 02)
00:1d.2 USB Controller: Intel Corp. 82801CA/CAM USB (Hub #3) (rev 02)
00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB PCI Bridge (rev 42)
00:1f.0 ISA bridge: Intel Corp. 82801CA ISA Bridge (LPC) (rev 02)
00:1f.1 IDE interface: Intel Corp. 82801CA IDE U100 (rev 02)
00:1f.3 SMBus: Intel Corp. 82801CA/CAM SMBus (rev 02)
01:1c.0 PIC: Intel Corp. 82870P2 P64H2 I/OxAPIC (rev 04)
01:1d.0 PCI bridge: Intel Corp. 82870P2 P64H2 Hub PCI Bridge (rev 04)
01:1e.0 PIC: Intel Corp. 82870P2 P64H2 I/OxAPIC (rev 04)
01:1f.0 PCI bridge: Intel Corp. 82870P2 P64H2 Hub PCI Bridge (rev 04)
02:03.0 Ethernet controller: Intel Corp. 82546EB Gigabit Ethernet Controller
(Copper) (rev 01)
02:03.1 Ethernet controller: Intel Corp. 82546EB Gigabit Ethernet Controller
(Copper) (rev 01)
03:02.0 Unknown mass storage controller: CMD Technology Inc Silicon Image SiI
3112 SATARaid Controller(rev 02)
03:03.0 Unknown mass storage controller: CMD Technology Inc Silicon Image SiI
3112 SATARaid Controller(rev 02)
04:01.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27)
dmesg
: SCSI subsystem initialized
: libata version 1.10 loaded.
: sata_sil version 0.8
: ACPI: PCI interrupt 0000:03:02.0[A] -> GSI 26 (level, low) -> IRQ 169
: ata1: SATA max UDMA/100 cmd 0xF8802080 ctl 0xF880208A bmdma 0xF8802000 irq
169
: ata2: SATA max UDMA/100 cmd 0xF88020C0 ctl 0xF88020CA bmdma 0xF8802008 irq
169
: ata1: dev 0 cfg 49:2f00 82:7c6b 83:7b09 84:4003 85:7c69 86:3a01 87:4003
88:207f
: ata1: dev 0 ATA, max UDMA/133, 160086528 sectors:
: ata1: dev 0 configured for UDMA/100
: scsi0 : sata_sil
: ata2: dev 0 cfg 49:2f00 82:74eb 83:7feb 84:4123 85:74e8 86:3c03 87:4123
88:207f
: ata2: dev 0 ATA, max UDMA/133, 781422768 sectors: lba48
: ata2: dev 0 configured for UDMA/100
: scsi1 : sata_sil
: Vendor: ATA Model: Maxtor 6Y080M0 Rev: YAR5
: Type: Direct-Access ANSI SCSI revision: 05
: Vendor: ATA Model: HDS724040KLSA80 Rev: KFAO
: Type: Direct-Access ANSI SCSI revision: 05
: ACPI: PCI interrupt 0000:03:03.0[A] -> GSI 27 (level, low) -> IRQ 177
: ata3: SATA max UDMA/100 cmd 0xF8804480 ctl 0xF880448A bmdma 0xF8804400 irq
177
: ata4: SATA max UDMA/100 cmd 0xF88044C0 ctl 0xF88044CA bmdma 0xF8804408 irq
177
: ata3: dev 0 cfg 49:2f00 82:74eb 83:7feb 84:4123 85:74e8 86:3c03 87:4123
88:207f
: ata3: dev 0 ATA, max UDMA/133, 781422768 sectors: lba48
: ata3: dev 0 configured for UDMA/100
: scsi2 : sata_sil
: ata4: no device found (phy stat 00000000)
: scsi3 : sata_sil
: Vendor: ATA Model: HDS724040KLSA80 Rev: KFAO
: Type: Direct-Access ANSI SCSI revision: 05
: NET: Registered protocol family 1
: SCSI device sda: 160086528 512-byte hdwr sectors (81964 MB)
: SCSI device sda: drive cache: write back
: SCSI device sda: 160086528 512-byte hdwr sectors (81964 MB)
: SCSI device sda: drive cache: write back
: /dev/scsi/host0/bus0/target0/lun0: p1 p2 p3 p4 < p5 p6 >
: Attached scsi disk sda at scsi0, channel 0, id 0, lun 0
: SCSI device sdb: 781422768 512-byte hdwr sectors (400088 MB)
: SCSI device sdb: drive cache: write back
: SCSI device sdb: 781422768 512-byte hdwr sectors (400088 MB)
: SCSI device sdb: drive cache: write back
: /dev/scsi/host1/bus0/target0/lun0: unknown partition table
: Attached scsi disk sdb at scsi1, channel 0, id 0, lun 0
: SCSI device sdc: 781422768 512-byte hdwr sectors (400088 MB)
: SCSI device sdc: drive cache: write back
: SCSI device sdc: 781422768 512-byte hdwr sectors (400088 MB)
: SCSI device sdc: drive cache: write back
: /dev/scsi/host2/bus0/target0/lun0: unknown partition table
: Attached scsi disk sdc at scsi2, channel 0, id 0, lun 0
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