Re: Resize command syntax wrong?

[Phillip Susi <psusi@xxxxxxxxxx>]

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On 11/30/2011 01:59 PM, Helmut Hullen wrote:
> Hallo, Phillip,
> 
> Du meintest am 30.11.11:
> 
>> Currently the resize command is under filesystem, and takes a path to
>> the mounted filesystem.  This seems wrong to me.  Shouldn't it be
>> under device, and take a path to a device to resize?
> 
> No - it's a filesystem operation.

No, it isn't.  You can see the function that implements the resize in the code operates on a specific disk, and the ioctl does take as an argument which disk you are trying to resize.  Logically you are adjusting the space that is available on a particular device, which only indirectly affects the filesystem.  In other words, the only reason that the size of the filesystem changes is because you have changed the size of a device.  In fact, internally device removal is implemented by first resizing the device to 0.

It appears that the utility just passes devid=1 to the kernel when you don't specify it.  It should take a dev node as an argument and translate it to the devid for you.

> p.e.
> You start with a system of 2 disks. They get filled nearly  
> simultaneously.
> Then you add a 3rd disk (which is empty at that time). Now it's a good  
> idea to run "balance" for equalizing the filling.

balance != resize

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