On 2 May 2013 14:29, Stefan Borggraefe [off-list ref] wrote:

Am Donnerstag, 2. Mai 2013, 14:17:04 schrieb Mathias Burén:

quoted

On 2 May 2013 14:14, Stefan Borggraefe [off-list ref] wrote:

quoted

Am Donnerstag, 2. Mai 2013, 13:30:22 schrieb Mathias Burén:

quoted

I won't scold you for using RAID5 instead of RAID6 with this number of
if drives and especially the size of the drives.

Could you please post the output of smartctl -a for each device? (from
smartmontools)

That way we can verify which HDDs are broken, before proceeding.

Mathias

Hello Mathias,

RAID6 would have been the safer option clearly, but we needed the
extra-space and only had this number of drives available.

Here the requested output:

smartctl -a /dev/sdc
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.2.0-37-generic] (local
build) Copyright (C) 2002-11 by Bruce Allen,
http://smartmontools.sourceforge.net

Vendor:               Hitachi
Product:              HUS724040ALE640
Revision:             MJAO
User Capacity:        4.000.787.030.016 bytes [4,00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x5000cca22bd08a85
Serial number:              PK2331PAH5D0YT
Device type:          disk
Local Time is:        Thu May  2 15:09:16 2013 CEST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

[...]

Hm are these behind some controller of sorts? What about smartctl -x ?

We use an Adaptec 71605 controller. smartctl -x does not provide any more
useful information, I suppose. I only post the output of one drive as an
example this time. They all give a similar result.

smartctl -x /dev/sdc
smartctl 5.41 2011-06-09 r3365 [x86_64-linux-3.2.0-37-generic] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net

Vendor:               Hitachi
Product:              HUS724040ALE640
Revision:             MJAO
User Capacity:        4.000.787.030.016 bytes [4,00 TB]
Logical block size:   512 bytes
Logical Unit id:      0x5000cca22bd08a85
Serial number:              PK2331PAH5D0YT
Device type:          disk
Local Time is:        Thu May  2 15:20:55 2013 CEST
Device supports SMART and is Enabled
Temperature Warning Disabled or Not Supported
SMART Health Status: OK

Current Drive Temperature:     <not available>

Error Counter logging not supported
Device does not support Self Test logging
Device does not support Background scan results logging
scsiPrintSasPhy Log Sense Failed [unsupported field in scsi command]

What about the state of the software RAID5? It would be great if I
could bring it back to a state where the filesystem on it is fully
working again without having to copy the 20 TB of data to it again
(copying this amount of data takes some time :( ).
--
Best regards,
Stefan Borggraefe

Ugh, Adaptec, not my favourite controller. Do you have arcconf
installed? You could to arcconf getconfig 1 (or whatever your
controller number is) to grab some information regarding your
controller and the HDDs connected to it.

Do you have /dev/sg? devices? If so, smartctl -a might work on them.
Re the software RAID, I would double check the health of your HDDs
before attempting anything.

Mathias
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