Re: raid1: All my data completely vanished into the void

On Tuesday 27 December 2005 11:33 pm, you wrote:

In short: it *definitely* should *not* have come back with what you saw.
I have no clue why this happened, all I can say is that I use md on
around 10 business critical production machines in exactly the way you
describe, and I have not seen this (though I've seen the failure modes I
described!).

I myself have been using md, mdadm for more than a year in multiple machines. 
I am at a loss. The only difference is now SATA drives with SATA controllers.

Are you positively sure that nothing else weird could have been going
on? Some layer that remaps drive names? funky hardware? write caching
capable of holding 3GB before writing out? Write caching of some sort is
actually my best guess.

  9.8Gb actually! same 3.2 Gb sent to each of the 3 raid 1 drive arrays to 
really  give them a workout, sent with rsync.

Only kicker is that this setup is Sata disks using the kernel sata drivers as 
modules. I have always used Pata drives before.

 

I get no kernel error messages at all. 
dmesg from the reboot tells me

First for the modules that come with linux: and the devices

libata version 1.02 loaded.
sata_via version 0.20
ACPI: PCI interrupt 0000:00:0f.0[B] -> GSI 20 (level, low) -> IRQ 185
sata_via(0000:00:0f.0): routed to hard irq line 10
ata1: SATA max UDMA/133 cmd 0xC000 ctl 0xB802 bmdma 0xA800 irq 185
ata2: SATA max UDMA/133 cmd 0xB400 ctl 0xB002 bmdma 0xA808 irq 185
ata1: dev 0 cfg 49:2f00 82:746b 83:7f01 84:4023 85:7469 86:3c01 87:4023 
88:407f
ata1: dev 0 ATA, max UDMA/133, 781422768 sectors: lba48
ata1: dev 0 configured for UDMA/133
scsi1 : sata_via
ata2: dev 0 cfg 49:2f00 82:746b 83:7f01 84:4023 85:7469 86:3c01 87:4023 
88:407f
ata2: dev 0 ATA, max UDMA/133, 781422768 sectors: lba48
ata2: dev 0 configured for UDMA/133
scsi2 : sata_via
  Vendor: ATA       Model: WDC WD4000YR-01P  Rev: 01.0
 Type:   Direct-Access                      ANSI SCSI revision: 05
SCSI device sde: 781422768 512-byte hdwr sectors (400088 MB)
SCSI device sde: drive cache: write back
 /dev/scsi/host1/bus0/target0/lun0: unknown partition table
Attached scsi disk sde at scsi1, channel 0, id 0, lun 0
  Vendor: ATA       Model: WDC WD4000YR-01P  Rev: 01.0
  Type:   Direct-Access                      ANSI SCSI revision: 05
SCSI device sdf: 781422768 512-byte hdwr sectors (400088 MB)
SCSI device sdf: drive cache: write back
 /dev/scsi/host2/bus0/target0/lun0: unknown partition table
Attached scsi disk sdf at scsi2, channel 0, id 0, lun 0

Notice the unknown partition table:

Then for the data from dmesg about the devices mounted on the highpoint 
rocketraid 1520 which used the proprietary hpt37x2.ko kernel module that I 
added to initrd and /lib/modules/`uname -r`/kernel/drivers/ide or whatever

hpt37x2: no version for "scsi_remove_host" found: kernel tainted.
HPT37x2 RAID Controller driver

SCSI device sda: 781422767 512-byte hdwr sectors (400088 MB)
sda: asking for cache data failed
sda: assuming drive cache: write through
 /dev/scsi/host0/bus0/target0/lun0: p1
SCSI device sda: 781422767 512-byte hdwr sectors (400088 MB)
sda: asking for cache data failed
sda: assuming drive cache: write through
 /dev/scsi/host0/bus0/target0/lun0: p1
SCSI device sdb: 781422767 512-byte hdwr sectors (400088 MB)
sdb: asking for cache data failed
sdb: assuming drive cache: write through
 /dev/scsi/host0/bus0/target1/lun0: p1
SCSI device sdb: 781422767 512-byte hdwr sectors (400088 MB)
sdb: asking for cache data failed
sdb: assuming drive cache: write through
 /dev/scsi/host0/bus0/target1/lun0: p1
SCSI device sdc: 781422767 512-byte hdwr sectors (400088 MB)
sdc: asking for cache data failed
sdc: assuming drive cache: write through
 /dev/scsi/host0/bus0/target2/lun0: p1
SCSI device sdc: 781422767 512-byte hdwr sectors (400088 MB)
sdc: asking for cache data failed
sdc: assuming drive cache: write through
 /dev/scsi/host0/bus0/target2/lun0: p1
SCSI device sdd: 781422767 512-byte hdwr sectors (400088 MB)
sdd: asking for cache data failed
sdd: assuming drive cache: write through
 /dev/scsi/host0/bus0/target3/lun0: p1
SCSI device sdd: 781422767 512-byte hdwr sectors (400088 MB)
sdd: asking for cache data failed
sdd: assuming drive cache: write through
 /dev/scsi/host0/bus0/target3/lun0: p1

If there's no extra data to explain this, I'm at a loss.

I wish I knew what else to check. I just bought 16 SATA drives for 2 servers!

Anyone else?

-Mike
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