Replacing disk in Linux Software RAID 1

[Michael Mansour]

Hi Michael,

Many thanks for the below, I'll try this process
tonight.

With the "Ghost", could I simply boot from a Live
Rescue CD and use something like:

# dd if=/dev/hdg of=/dev/hde

where /dev/hde would be the new blank drive?

Michael.

 --- "Michael E. Webster" <mwebster at intercosmos.com>
wrote: 
> Michael, 
> 
> Whaddaya know..  I just happen to have a recipe for
> doing this.
> I went through a similar problem about two months
> ago.
> Just substitute /dev/hde and /def/hdg where
> applicable.
> 
> 
> Copy the MBR to /dev/hdc (done before procedure)
> 
> prompt# grub
> 
> Grub> device (hd0) /dev/hdc
> 
> Grub> root (hd0,0)
> 
> Grub> setup (hd0)
> 
> 
> Make sure that we have the partition table for all
> drives backed up
> (done before)
> 
> prompt# sfdisk -d /dev/hda >
> /raidinfo/partitions.hda
> 
> prompt# sfdisk -d /dev/hdc >
> /raidinfo/partitions.hdc
> 
> prompt# more /proc/mdstat > /raidinfo/mdstat.md
> 
> 
> Estimated time: zero minutes
> 
> 
> Shutdown the box
> 
> Remove /dev/hda and label as â??hda badâ??
> 
> Boot box to make sure it boots
> 
> Shutdown server and place new blank drive in ide0
> (new hda)
> 
> Estimated time: ten minutes 
> 
> 
> Ghost ide1 (hdc) to ide0 (hda)
> 
> Do â??Boot Imageâ?? copy
> 
> Estimated time: a little more than an hour
> 
> 
> Remove ide1 (original hdc) and label as â??hdc
> goodâ??
> 
> Power on to make sure ide0 (new hda) boots
> 
> Shutdown and place new blank drive in ide1 (new hdc)
> 
> Power on to make sure it boots
> 
> Shutdown
> 
> Estimated time: fifteen minutes
> 
> 
> Power on and boot
> 
> Copy the MBR to hdc
> 
> prompt# grub
> 
> Grub> device (hd0) /dev/hda
> 
> Grub> root (hd0,0)
> 
> 
> 
> Hope this helps,
> Mike.
> 
> 
> 
> 
> On Fri, 2004-08-13 at 17:51, Michael Mansour wrote:
> > Hi,
> > 
> > I have a server with a 2 disk Linux Software RAID
> 1
> > setup (two 80Gb disks). The first device is
> /dev/hde
> > and the second is /dev/hdg.
> > 
> > The /dev/hde device is ready to fail, as it
> produces
> > various SMART errors using smartctl and fails on a
> > self-test with:
> > 
> > [root at gazelle root]# smartctl -l selftest /dev/hde
> > smartctl version 5.30 Copyright (C) 2002-4 Bruce
> Allen
> > Home page is http://smartmontools.sourceforge.net/
> > 
> > === START OF READ SMART DATA SECTION ===
> > SMART Self-test log structure revision number 1
> > Num  Test_Description    Status                 
> > Remaining  LifeTime(hours)  LBA_of_first_error
> > # 1  Short offline       Completed: read failure  
>    
> > 90%        34         0x0463c0ee
> > # 2  Short offline       Completed: read failure  
>    
> > 90%      1087         0x0425290c
> > # 3  Extended offline    Completed: read failure  
>    
> > 90%      1072         0x0425290c
> > # 4  Short offline       Completed: read failure  
>    
> > 90%      1072         0x0425290c
> > # 5  Short offline       Completed: read failure  
>    
> > 90%      1071         0x0425290c
> > 
> > The server is running Fedora Core 1.
> > 
> > I have the new 80Gb disk and wish to replace
> /dev/hde
> > device with the new disk, how do I do this?
> > 
> > The following is how I have the mirror setup:
> > 
> > # fdisk -l /dev/hde
> > 
> > Disk /dev/hde: 80.0 GB, 80026361856 bytes
> > 255 heads, 63 sectors/track, 9729 cylinders
> > Units = cylinders of 16065 * 512 = 8225280 bytes
> > 
> >    Device Boot    Start       End    Blocks   Id 
> > System
> > /dev/hde1   *         1       395   3172806    b 
> > Win95 FAT32
> > /dev/hde2           396       408    104422+  fd 
> > Linux raid autodetect
> > /dev/hde3           409      1070   5317515   fd 
> > Linux raid autodetect
> > /dev/hde4          1071      9729  69553417+   f 
> > Win95 Ext'd (LBA)
> > /dev/hde5          1071      1331   2096451   fd 
> > Linux raid autodetect
> > /dev/hde6          1332      1585   2040223+  fd 
> > Linux raid autodetect
> > /dev/hde7          1586      1716   1052226   fd 
> > Linux raid autodetect
> > /dev/hde8          1717      4327  20972826   fd 
> > Linux raid autodetect
> > /dev/hde9          4328      9729  43391533+  fd 
> > Linux raid autodetect
> > 
> > with /dev/hdg being exactly like above.
> > 
> > As soon as I pull out the /dev/hde device, the
> server
> > won't boot (as grub only resides on /dev/hde), so
> I
> > also installed grub on /dev/hdg to overcome that
> > problem. But now I'm wondering what I must do to
> pull
> > out /dev/hde and replace it with the new drive
> (which
> > doesn't have any partitioning setup) and then
> force
> > Linux to resync the data on /dev/hdg to the new
> > /dev/hde?
> > 
> > Is there some way I have to fail the /dev/hde
> drive,
> > replace it then put it back on-line? First time
> I've
> > done this with Software RAID so I'm not sure.
> > 
> > Any advice is appreciated.
> > 
> > Michael.
> > 
> > 
> > Find local movie times and trailers on Yahoo!
> Movies.
> > http://au.movies.yahoo.com
> > 
> 
> 
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