[dm-devel] device mapper and resizing devices

[Arthur Bergman]

As far as I understand this is not supported. What we do is we add a 
new device, we then do sg_reset -b /dev/sgX and then we add them into 
the volume group and then we resize it.

I would also warn you that we have seen corruption repeatable times 
with xfs over devicemapper under 2.6.

Cheers
Arthur

-----
CTO @ Fotango Ltd
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On 1 Mar 2005, at 21:03, Andy wrote:

> I am using dm-multipath on non-partitioned (xfs) devices on a SAN.  If 
> I
> resize the device, and rescan my path devices (i.e rescan /dev/sda,
> /dev/sdb, /dev/sdc,/dev/sdd (all the same path)) the kernel sees the 
> new
> size of the individual devices, but the /sys/block/dm-0 device is 
> still the
> old size.  I believe this is the reason why I cannot grow my xfs 
> filesystem
> without doing a reboot so that the dm device will have the new size. 
> I'd
> like to avoid unmounting and rebooting to resize the device.  I haven't
> played with lvm enough to feel comfortable using it.  Is there any way 
> to
> get the dm device to be the proper size, or is this a bug, or a 
> feature that
> needs further discussion?
>
> Andy
>
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