> > My question is: how can I know if one disk fails?
> > Is there something link /proc/mdstat ?
> > Alternatively: if one disk fail any message will be written
> > to the log files?
> By nature of RAID, you won't see any information for physical
> disk drives associated to the RAID1.
> However, you will find the information for RAID1 from /proc.
Ok, but how can I know when a disk goes offline?
I wasn't able to find any information about the status of RAID1 in /proc
For example, with an LSI MegaIDE I get the following with
cat /proc/megaide/0/status
------------------------------------------------------------------------
Logical Drive Information
Status : ONLINE Logical Drive No: 0
Physical Drive Information
------ PRIMARY ------ ----- SECONDARY -----
MASTER SLAVE MASTER SLAVE
STATUS : ONLINE OFFLINE ONLINE OFFLINE
No Of Errors : 0 0 0 0
No Of Pending Commands : 0 0 0 0
------------------------------------------------------------------------
Or, with an Adaptec SCSI controller, I get the following with the Adaptec utilities:
--------------------------------------------------------------------------
Adaptec SCSI RAID Controller Command Line Interface
Copyright 1998-2002 Adaptec, Inc. All rights reserved
--------------------------------------------------------------------------
Executing: open "aac0"
Executing: container list
Num Total Oth Stripe Scsi Partition
Label Type Size Ctr Size Usage C:ID:L Offset:Size
----- ------ ------ --- ------ ------- ------ -------------
0 RAID-5 136GB 64KB Open 0:00:0 64.0KB:68.3GB
/dev/sda ARRAY 0:02:0 64.0KB:68.3GB
0:04:0 64.0KB:68.3GB
Executing: disk list
C:ID:L Device Type Blocks Bytes/Block Usage Shared Rate
------ -------------- --------- ----------- ---------------- ------ ----
0:00:0 Disk 143374000 512 Initialized NO 320
0:02:0 Disk 143374000 512 Initialized NO 320
0:04:0 Disk 143374000 512 Initialized NO 320
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