Turn off bad block reallocation

[Neale Machin]

We've just been connected to a Symmetrix and have been told that when we use the disks under LVM we have to turn the bad block reallocation off. I can see how to do it in sam but does anyone know what command and parameter does this.

[Dirk Wiedemann]

Hi

the LVM-command is lvchange with option -r ...
have a look at the manpage for lvchange.

Dirk

[Tom Geudens]

Hi,
Normally you do this in the lvcreate.
#lvcreate -L xxx -r N -n lv_name vgname
Where the "-r N" turns the bad block relocation off.

This is also an option of the lvchange command.

Regards,
Tom

[James Beamish-White]

As above - see the man page for lvcreate and search for 'bad block'.

But more as a FYI - when in SAM, if you want to figure out what it is doing, have a look at the samlog after doing the task. It'll show you what tasks it did :-)

Cheers!
James

[T G Manikandan · Accepted solution]

For example if you are creating a new logical volume

#lvcreate -L 800 -n vol1 -r n /dev/vgxx

-L logical voulme size
-r reallocation policy
-n logical volume name

-C contigous or not

check the lvcreate man pages

If you want to stop bad block reallocation off
then use
-r n


Thanks

[Trond Haugen]

The reason you have to do this is tha the EMC (normally) does the bad block reallocation and things will go wring if LVM does too.
You can change it with lvchange -r n.

Regards,
Trond