Success upgade / olderstyle raid --> newstyle raid

[Schackel, Fa. Integrata, ZRZ DA]

Hi Maillist Members,

I've done a successfull upgrade for my raid5 TestDrive (9x 7MBytes) from mdtools 0.4x 
to the aktuell RaidTools 0.90 with persistent-superblock. All auto startup works best.
Due to the Mail from Brian a 'few days' ago I was very carefull with that procedure, 
only going step by step.
1st upgradin without SuperBlock, than with SuperBlock (all Data fine). At last 
updating the Partition Type to 0xfd for RaidAutoStartup.

For the testing I had half the raid full of data. After mkraid --upgrade (and 
persistent-superblock =1) all Data where readable.


Questions:
Can I assume that my productive raids will also upgraded without dataloss??
  (I know Backup is allways recommended..)
Where there Codechanges since there was the recomended not to set the 
persistent-superblock to 1, because fo dataloss ??

Bye for now,
Barney

--
I will post a full report if I'm finaly done.
--

> -----Ursprüngliche Nachricht-----
> Von: Brian [mailto:[EMAIL PROTECTED]]
> Gesendet: Freitag, 2. Juli 1999 01:54
> An: [EMAIL PROTECTED]
> Betreff: olderstyle raid --> newstyle raid
> 
> 
> I have recently upgraded some boxes from RH5.2 to RH6.0 and 
> have run into
> some problems with getting my arrays to work.
> 
> The arrays were created under RH5.2 with raidtools-0.50beta10-2.
> 
> I cannot set "persistant-superblock" to 1, because then it 
> would destroy
> my data correct?  So I leave it to 0.  
> 
> I try mkraid, to upgrade and it fails:
> 
> [root@sol /tmp]# cat /proc/mdstat 
> Personalities : [raid0] 
> read_ahead not set
> unused devices: <none>
> [root@sol /tmp]# /sbin/mkraid --upgrade /dev/md0
> handling MD device /dev/md0
> analyzing super-block
> disk 0: /dev/hdc1, 11255296kB, raid superblock at 11255232kB
> cannot upgrade magic-less superblock on /dev/hdc1 ...
> mkraid: aborted
> 
> here is my raidtab
> 
> [root@sol /tmp]# cat /etc/raidtab
> raiddev                 /dev/md0
> raid-level              0               # it's not obvious 
> but this *must
> be 
>                                         # right after raiddev
> 
> persistent-superblock   0    # set this to 1 if you want autostart,
>                              # BUT SETTING TO 1 WILL DESTROY PREVIOUS
>                              # CONTENTS if this is a RAID0 
> array created
>                              # by older raidtools (0.40-0.51) 
> or mdtools!
> 
> chunk-size              4
> 
> 
> nr-raid-disks           2
> nr-spare-disks          0
> 
> device                  /dev/hdc1
> raid-disk               0
> 
> device                  /dev/hdd1
> raid-disk               1
> 
> 
> I read the HOWTO, which basically says:
> 
>   1. You need autodetection support in the kernel. Check this
>   2. You must have created the RAID devices using 
> persistent-superblock
>   3. The partition-types of the devices used in the RAID must 
> be set to
>      0xFD  (use fdisk and set the type to ``fd'')
> 
> 
> I don't think when upgrading, #2 and #3 are necessary, correct?  I am
> assuming since their is a --upgrade flag in mkraid, that 
> someone must know
> how to upgrade these older style raids to newer style.
> 
> I was sort of disappointed by Redhat on this one.  They don't 
> even remove
> "raidadd" and "raidrun" from the initscripts.  Nor do they give any
> insightfull information on what to do with your raids after upgrading.
> 
> So basically if anyone has any idea how to upgrade these 
> older raids, that
> would be much appreciated. I did subscribe to the list right 
> now, but I
> didn't get my confirmation back yet, so if you could email me 
> as well as
> reply to the list, that would be appreciated.
> 
> Brian
> 
> 
> -----------------------------------------------------
> Brian Feeny (BF304)     [EMAIL PROTECTED]   
> 318-222-2638 x 109    http://www.shreve.net/~signal      
> Network Administrator   ShreveNet Inc. (ASN 11881)          
> 
>