[BlueOnyx:15051] Re: DegradedArray event on /dev/md0

[Gerald Waugh]

On 03/31/2014 09:57 AM, Gerald Waugh wrote:
> On 03/31/2014 06:39 AM, RC Barker wrote:
>> Hey Gerald,
>> This is what I got
>> [root at openx tmp]#  mdadm hotadd /dev/md0 /dev/sdb1
>> mdadm: An option must be given to set the mode before a second device is 
>> listed
>> [root at openx tmp]# mdadm /dev/md0 -a /dev/sdb1
>> mdadm: cannot find /dev/sdb1: No such file or directory
>> [root at openx tmp]#
>>
>> And this
>> [root at openx tmp]# smartctl -a /dev/sdb
>> smartctl 5.42 2011-10-20 r3458 [i686-linux-2.6.18-348.12.1.el5PAE] 
>> (local build)
>> Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
>>
>> Smartctl open device: /dev/sdb failed: No such device
>> [root at openx tmp]#
>> RC
> check that sdb drive is connected properly. else looks like sdb may be kaput
>
more;

You might look for errors here, and maybe older messages files
   dmesg | grep sdb
   cat /var/log/messages | grep sdb