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Raid:Manual Rebuild (view source)

Revision as of 12:40, 22 March 2010

808 bytes removed ,  12:40, 22 March 2010
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=== Fail and remove the disk, '''sdb''' in this case ===
 
=== Fail and remove the disk, '''sdb''' in this case ===
   −
  [root@ ~]# mdadm --manage /dev/md2 --fail /dev/sdb2
+
  [root@ ~]# '''mdadm --manage /dev/md2 --fail /dev/sdb2'''
 
  mdadm: set /dev/sdb2 faulty in /dev/md2
 
  mdadm: set /dev/sdb2 faulty in /dev/md2
−
  [root@ ~]# mdadm --manage /dev/md2 --remove /dev/sdb2
+
  [root@ ~]# '''mdadm --manage /dev/md2 --remove /dev/sdb2'''
 
  mdadm: hot removed /dev/sdb2
 
  mdadm: hot removed /dev/sdb2
−
  [root@ ~]# mdadm --manage /dev/md1 --fail /dev/sdb1
+
  [root@ ~]# '''mdadm --manage /dev/md1 --fail /dev/sdb1'''
 
  mdadm: set /dev/sdb1 faulty in /dev/md1
 
  mdadm: set /dev/sdb1 faulty in /dev/md1
−
  [root@ ~]# mdadm --manage /dev/md1 --remove /dev/sdb1
+
  [root@ ~]# '''mdadm --manage /dev/md1 --remove /dev/sdb1'''
 
  mdadm: hot removed /dev/sdb1
 
  mdadm: hot removed /dev/sdb1
    
=== Add the partitions back ===
 
=== Add the partitions back ===
   −
  [root@ ~]# mdadm --manage /dev/md1 --add /dev/sdb1
+
  [root@ ~]# '''mdadm --manage /dev/md1 --add /dev/sdb1'''
 
  mdadm: hot added /dev/sdb1
 
  mdadm: hot added /dev/sdb1
−
  [root@ ~]# mdadm --manage /dev/md2 --add /dev/sdb2
+
  [root@ ~]# '''mdadm --manage /dev/md2 --add /dev/sdb2'''
 
  mdadm: hot added /dev/sdb2
 
  mdadm: hot added /dev/sdb2
    +
== Partition / Re-Partition, this disk ==
    +
=== Delete Existing Partitions ===
   −
 
+
  [root@ ~]# '''fdisk /dev/sdb'''
−
 
  −
 
  −
 
  −
 
  −
 
  −
 
  −
 
  −
 
  −
===The Leadup===
  −
I'm not sure if I'm reporting a bug or just some manual maintenance
  −
 
  −
My Disk didn't respond correctly to the Menu option "Manage Disk Redundancy". I was upgrading the hard disks to 1Gb disks from the 500Gb that came with the Dell server, the new disks were the Seagate 1Tb ST1000340NS, they are a Server Edition disk. It did this on both disks
  −
 
  −
The Disk was installed as the 2nd Hard Disk during an Upgrade process
  −
 
  −
''It's not fatal'', but it did stop the machine from booting on the disk, perhaps that's just ''not living, therefore not fatal'', whatever, it's not terribly useful.
  −
 
  −
 
  −
and a look from fdisks view shows
  −
 
  −
Note the correct partitioning on sda
  −
 
  −
  [root@ ~]# fdisk -lu /dev/sda
  −
  −
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
  −
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
  −
Units = sectors of 1 * 512 = 512 bytes
  −
  −
    Device Boot      Start        End      Blocks  Id  System
  −
/dev/sda1  *          63      208844      104391  fd  Linux raid autodetect
  −
/dev/sda2          208845  1953520064  976655610  fd  Linux raid autodetect
  −
 
  −
What has happened here is the disk partition has been written too close to the start of the drive, so the boot record hasn't got enough room for its GRUB staging - if thats the right term.
  −
 
  −
To correct this, remove the disk from the array, you will need to fail it, then remove it, the repartition and add it back to the array
  −
 
  −
{{Note box|I'm using sdb which was right for me, it might not be for you (if it's RAID 1, there is a 50% chance it's not !)}}
  −
 
  −
===Here we go lets fix this===
  −
 
  −
 
  −
====Re-Partition, first clean the old partitions====
  −
 
  −
[root@ ~]# fdisk /dev/sdb
   
   
 
   
 
  The number of cylinders for this disk is set to 121601.
 
  The number of cylinders for this disk is set to 121601.
Line 203: Line 161:  
  Syncing disks.
 
  Syncing disks.
   −
====Then Create the new partitions====
+
=== Create new partitions ===
 +
 
 
Note: change the partitions system id to reflect Linux raid autodetect
 
Note: change the partitions system id to reflect Linux raid autodetect
   Line 215: Line 174:  
     (e.g., DOS FDISK, OS/2 FDISK)
 
     (e.g., DOS FDISK, OS/2 FDISK)
 
   
 
   
−
  Command (m for help): n
+
  Command (m for help): '''n'''
 
  Command action
 
  Command action
 
     e  extended
 
     e  extended
 
     p  primary partition (1-4)
 
     p  primary partition (1-4)
−
  p
+
  '''p'''
 
  Partition number (1-4): 1
 
  Partition number (1-4): 1
 
  First cylinder (1-121601, default 1):
 
  First cylinder (1-121601, default 1):
Line 225: Line 184:  
  Last cylinder or +size or +sizeM or +sizeK (1-121601, default 121601): 13
 
  Last cylinder or +size or +sizeM or +sizeK (1-121601, default 121601): 13
 
   
 
   
−
  Command (m for help): n
+
  Command (m for help): '''n'''
 
  Command action
 
  Command action
 
     e  extended
 
     e  extended
 
     p  primary partition (1-4)
 
     p  primary partition (1-4)
−
  p
+
  '''p'''
 
  Partition number (1-4): 2
 
  Partition number (1-4): 2
 
  First cylinder (14-121601, default 14):
 
  First cylinder (14-121601, default 14):
Line 236: Line 195:  
  Using default value 121601
 
  Using default value 121601
 
   
 
   
−
  Command (m for help): m
+
  Command (m for help): '''a'''
−
Command action
+
Partition number (1-4): '''1'''
−
    a   toggle a bootable flag
  −
    b  edit bsd disklabel
  −
    c  toggle the dos compatibility flag
  −
    d  delete a partition
  −
    l  list known partition types
  −
    m  print this menu
  −
    n  add a new partition
  −
    o  create a new empty DOS partition table
  −
    p  print the partition table
  −
    q  quit without saving changes
  −
    s  create a new empty Sun disklabel
  −
    t  change a partition's system id
  −
    u  change display/entry units
  −
    v  verify the partition table
  −
    w  write table to disk and exit
  −
    x  extra functionality (experts only)
   
   
 
   
−
  Command (m for help): a
+
  Command (m for help): '''t'''
−
Partition number (1-4): 1
+
  Partition number (1-4): '''1'''
−
+
  Hex code (type L to list codes): '''fd'''
−
Command (m for help): p
  −
  −
Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
  −
255 heads, 63 sectors/track, 121601 cylinders
  −
Units = cylinders of 16065 * 512 = 8225280 bytes
  −
  −
    Device Boot      Start        End      Blocks  Id  System
  −
/dev/sdb1  *          1          13      104391  83  Linux
  −
/dev/sdb2              14      121601  976655610  83  Linux
  −
  −
Command (m for help): t
  −
  Partition number (1-4): 1
  −
  Hex code (type L to list codes): fd
   
  Changed system type of partition 1 to fd (Linux raid autodetect)
 
  Changed system type of partition 1 to fd (Linux raid autodetect)
 
   
 
   
−
  Command (m for help): t
+
  Command (m for help): '''t'''
−
  Partition number (1-4): 2
+
  Partition number (1-4): '''2'''
−
  Hex code (type L to list codes): fd
+
  Hex code (type L to list codes): '''fd'''
 
  Changed system type of partition 2 to fd (Linux raid autodetect)
 
  Changed system type of partition 2 to fd (Linux raid autodetect)
 
   
 
   
−
  Command (m for help): p
+
  Command (m for help): '''p'''
 
   
 
   
 
  Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
 
  Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
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  /dev/sdb2              14      121601  976655610  fd  Linux raid autodetect
 
  /dev/sdb2              14      121601  976655610  fd  Linux raid autodetect
 
    
 
    
−
  Command (m for help): w
+
  Command (m for help): '''w'''
 
  The partition table has been altered!
 
  The partition table has been altered!
 
   
 
   
Line 294: Line 224:  
  Syncing disks.
 
  Syncing disks.
    +
== Write the GRUB boot sector ==
   −
====and lastly, write the boot sector====
+
  [root@ ~]# '''grub'''
−
 
  −
  [root@ ~]# grub
   
   
 
   
 
     GNU GRUB  version 0.95  (640K lower / 3072K upper memory)
 
     GNU GRUB  version 0.95  (640K lower / 3072K upper memory)
Line 305: Line 234:  
     completions of a device/filename.]
 
     completions of a device/filename.]
 
   
 
   
−
  grub> device (hd0) /dev/sdb
+
  grub> '''device (hd0) /dev/sdb'''
 
   
 
   
−
  grub> root (hd0,0)
+
  grub> '''root (hd0,0)'''
 
   Filesystem type is ext2fs, partition type 0xfd
 
   Filesystem type is ext2fs, partition type 0xfd
 
   
 
   
−
  grub> setup (hd0)
+
  grub> '''setup (hd0)'''
 
   Checking if "/boot/grub/stage1" exists... no
 
   Checking if "/boot/grub/stage1" exists... no
 
   Checking if "/grub/stage1" exists... yes
 
   Checking if "/grub/stage1" exists... yes
Line 320: Line 249:  
  Done.
 
  Done.
 
   
 
   
−
  grub> quit
+
  grub> '''quit'''
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
 
 +
===The Leadup===
 +
I'm not sure if I'm reporting a bug or just some manual maintenance
 +
 
 +
My Disk didn't respond correctly to the Menu option "Manage Disk Redundancy". I was upgrading the hard disks to 1Gb disks from the 500Gb that came with the Dell server, the new disks were the Seagate 1Tb ST1000340NS, they are a Server Edition disk. It did this on both disks
 +
 
 +
The Disk was installed as the 2nd Hard Disk during an Upgrade process
 +
 
 +
''It's not fatal'', but it did stop the machine from booting on the disk, perhaps that's just ''not living, therefore not fatal'', whatever, it's not terribly useful.
 +
 
 +
 
 +
and a look from fdisks view shows
 +
 
 +
Note the correct partitioning on sda
 +
 
 +
[root@ ~]# fdisk -lu /dev/sda
 +
 +
Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
 +
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
 +
Units = sectors of 1 * 512 = 512 bytes
 +
 +
    Device Boot      Start        End      Blocks  Id  System
 +
/dev/sda1  *          63      208844      104391  fd  Linux raid autodetect
 +
/dev/sda2          208845  1953520064  976655610  fd  Linux raid autodetect
 +
 
 +
What has happened here is the disk partition has been written too close to the start of the drive, so the boot record hasn't got enough room for its GRUB staging - if thats the right term.
 +
 
 +
To correct this, remove the disk from the array, you will need to fail it, then remove it, the repartition and add it back to the array
 +
 
 +
{{Note box|I'm using sdb which was right for me, it might not be for you (if it's RAID 1, there is a 50% chance it's not !)}}
 +
 
 +
===Here we go lets fix this===
 +
 
    
and then I can use the wiki's proceedure to grow the disk - which is why I am here
 
and then I can use the wiki's proceedure to grow the disk - which is why I am here
Davidbray
88

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Retrieved from "https://wiki.koozali.org/Special:MobileDiff/14435"

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