online data migration problem

[arvind mishra]

Hello All,

 

I am getting this error when i am adding iscsi disk to the existing raid 5

 

 mdadm: failed to add /dev/sdb1 to /dev/md1    4: Invalid argument

 

attached is my existing raid status

 

and sdb1 is the iscsi storage raid partition

 

Thanks

Arvind

On Thu, Jun 2, 2011 at 2:16 AM, me4u <torajve...@gmail.com> wrote:

Hi all,

Many people asks, we have published the luns to linux servers and how
to rescan it. Peoples are used to reboot the system and it works. If
you don't want to reboot the linux system, try this simple script :-

for HOST in `ls /sys/class/scsi_host`; do echo "- - -">/sys/class/
scsi_host/$HOST/scan; done

Hope, it will help.

~/Rajveer Singh
http://torajveersingh.blogspot.com/

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[Rajveer Singh]

Can you send your complete command and output which is giving this error.  Please use --verbose to get the detailed info with your mdadm command.

~/rajveer

[arvind mishra]

Hello Rajveer

 

I am attaching the screenshot

 

Re,

Arvind

[Rajveer Singh]

Arvind,

Try this:-

mdadm --add /dev/md1 /dev/sdb1 --verbose

And update
~/Rajveer

[arvind mishra]

I am getting the same error

[Tamim Daiyan]

Hi Arvind,

I do not know whether you have solved the matter, however, will you pleae try the followings as well.

1. You can not add another device in RAID 5 when all three devices are there. You have to drop one to add one. Since RAID 5 can handle 3 devices in single mount point.

2. Same goes for your another RAID 6. The quota is for 4. Adding another device will not help.

Please let us know whether the information was helpfull.

Thanks.

--Tamim

[arvind mishra]

Hello Rajveer,

Sorry for late reply.

Yes ,  the problem is solved by first removing one divice.

Thanks

[arvind mishra]

Hello Rajveer,

I am facing problem in configuring Cluster. I am not understanding some configuration like Fencing, quarrum etc. Kindly help me????????????????????????????????????