Is It Possible To Move Logical Volumes?

[Dave Bacon]

Thank you for your prompt reply Chris.  I fully understand and agree 
with your /var suggestion.  Would it be possible, or even wise, to just 
move /var/spool/mail to /dev/sdb?  This is the directory in /var I was 
most concerned about.

Your detailed instructions are very much appreciated.

Dave Bacon - OWLS

                _________________________________________

                              Dave G. Bacon
                        Computer Network Manager
                    Outagamie Waupaca Library System
                 225 N. Oneida St., Appleton, WI  54911
                 920/832-6193(voice),  920/832-6422(FAX)
                        dbacon at mail.owls.lib.wi.us
                          http://www.owlsweb.info
                _________________________________________




Chris Adams wrote:
> Once upon a time, Dave Bacon <dbacon at mail.owls.lib.wi.us> said:
>   
>> This new server will primarily be an eMail server.  So I was thinking
>> about moving /var and /home to /dev/sdb which has more space.  This will
>> also place most of the data on the RAID5 drives and keep it separate
>> from the OS RAID 1 drives.
>>     
>
> I'd personally probably leave /var with the rest of the OS (if /var
> isn't there, the OS is pretty much screwed anyway).  Also, /var/log gets
> a lot of writes, especially on a mail server, so RAID 5 could be a
> performance issue).  That's all just IMHO though.
>
>   
>> Could you please help answer my questions?
>>
>>   1. Is it possible to relocate /var and /home to /dev/sdb using the LVM?
>>     
>
> If the filesystems are on LVM already, then yes, this is easy and fairly
> straight-forward.  I've never used the GUI tools, but the CLI tool
> workflow would be something like:
>
> - fdisk /dev/sdb
>   make a single partition that covers the disk (type 8e for "Linux LVM")
>
> - lvm
>   1. pvcreate /dev/sdb
>      makes /dev/sdb an LVM physical volume
>   2. vgextend <VGName> /dev/sdb
>      adds the new PV to your existing volume group
>   3. pvmove -n <LVName> /dev/sdb
>      moves the specified logical volume to the specified PV
>      this step takes a while
>   4. lvextend -L <newsize> <LVName> /dev/sdb
>      increases the space allocated to the specified LV
>   (repeat steps 3 and 4 for each additional LV)
>
> - resize2fs -p /dev/<VGName></LVName>
>   increases the size of the filesystem to use all of the LV
>   (repeat for each additional filesystem)
>
>   
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