USB RAID 5 Problem on Joli OS 1.2 (Ubuntu) using mdadm Post: 302707827

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Top Forums UNIX for Advanced & Expert Users USB RAID 5 Problem on Joli OS 1.2 (Ubuntu) using mdadm Post 302707827 by powelltallen on Sunday 30th of September 2012 04:49:01 AM

09-30-2012

Registered User

Hi,
From:

Code:

root@gokopjolicloud:/home/gokop# mdadm --detail /dev/md0 
/dev/md0:
        Version : 00.90
  Creation Time : Wed Sep 26 16:05:30 2012
     Raid Level : raid5
     Array Size : 31266560 (29.82 GiB 32.02 GB)
  Used Dev Size : 15633280 (14.91 GiB 16.01 GB)
   Raid Devices : 3
  Total Devices : 3
Preferred Minor : 0
    Persistence : Superblock is persistent

    Update Time : Sun Sep 30 11:07:47 2012
          State : clean, degraded, recovering
 Active Devices : 2
Working Devices : 3
 Failed Devices : 0
  Spare Devices : 1

         Layout : left-symmetric
     Chunk Size : 64K

 Rebuild Status : 6% complete

           UUID : 0e6fee1c:4a05e886:b1380be4:00007494 (local to host gokopjolicloud)
         Events : 0.98

    Number   Major   Minor   RaidDevice State
       0       8       17        0      active sync   /dev/sdb1
       1       8       33        1      active sync   /dev/sdc1
       3       8       49        2      spare rebuilding   /dev/sdd1

Please if I remove one of the active disks (/devsdb1 or /dev/sdc1), how can I reconstruct the data. I have saved a file on /dev/md0. Or if i remove the degraded spare /dev/sdd1, what happens? I want to test how to reconstruct my data when any of the 3 raid5 disks is removed (a scenario for a failed disk)

Regards
Powell

powelltallen

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LEARN ABOUT V7

msglog

msglog(7D)							      Devices								msglog(7D)

NAME

       msglog - message output collection from system startup or background applications

SYNOPSIS

       /dev/msglog

DESCRIPTION

       Output from system startup ("rc") scripts is directed to /dev/msglog, which dispatches it appropriately.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsr			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Stable			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       syslogd(1M), syslog(3C), attributes(5), sysmsg(7D)

NOTES

       In  the	current  version of Solaris, /dev/msglog is an alias for /dev/sysmsg.  In future versions of Solaris, writes to /dev/msglog may be
       directed into a	more general logging mechanism such as syslogd(1M).

       syslog(3C) provides a more general logging mechanism  than /dev/msglog and should be used in preference to /dev/msglog whenever possible.

SunOS 5.10							    13 Oct 1998 							msglog(7D)