On 06/26/2012 12:50 AM, Keith Keller wrote:
> On 2012-06-25, John R Pierce <pierce@xxxxxxxxxxxx> wrote:
>> On 06/25/12 1:10 PM, Alexander Dalloz wrote:
>>>> they really should be better integrated, like the way LVM and JFS are
>>>>> integrated on AIX.
>>>>>
>>>>> # chfs -a size=+2G /var
>>>>>
>>>>> adds 2GB to /var, online, automatically. grows the logical volume and
>>>>> resizes the file system, all at once.
>>> Don't know where software RAID comes into play on AIX, but what is the
>>> difference of that command above to this one on CentOS 6?
>>>
>>> # lvresize -L+2G -r VG_sys/LV_var
>>
>> does lvresize resize the file system while online? I didn't think it
>> did. the man page for fsadm (referenced in the lvresize man page) says
>> ext2/3/4 is unmounted before resizing. ooops. kind of hard to umount
>> /var !
>
> My man page for fsadm (CentOS 6) implies that you need to provide -e in
> order for fsadm to umount an ext? filesystem before attempting the
> resize. So in theory if you don't give -e it should resize while
> mounted.
>
I know that a combination of lvextend and resize2fs can be done online. I
regulary add new virtual disks to guests and then add the space to the root
partition in these guests in fact I just added 100G of space to a mongodb
VM a few minutes ago.
While I haven't used the -r switch yet I would think that it uses the same
mechanism and thus should do all its work online as well.
Regards,
Dennis
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