my ZCS 7.1.4 is running out of space. It is 89% used now (of 240 GB).
ZCS running as VM on ESXi 5.0.
root@zimbra:# fdisk -l

Disk /dev/sda: 268.4 GB, 268435456000 bytes
255 heads, 63 sectors/track, 32635 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x0006f39d

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          31      248976   83  Linux
/dev/sda2              32       32635   261891630    5  Extended
/dev/sda5              32       32635   261891598+  8e  Linux LVM
root@zimbra:# df -h
Filesystem            Size  Used Avail Use% Mounted on
                      239G  201G   27G  89% /
varrun                3.8G   48K  3.8G   1% /var/run
varlock               3.8G     0  3.8G   0% /var/lock
udev                  3.8G   52K  3.8G   1% /dev
devshm                3.8G     0  3.8G   0% /dev/shm
/dev/sda1             236M   26M  198M  12% /boot
First, I am more windows guy and mostly copy-paste Linux admin with dozen google search results opened for each Linux command.
Now as I understand, I have 2 options:
a.) Add some 200 GB to existing disk via VMWare Client, then extend LVM partition to use additional space.
b.) Add 200 GB virtual disk to this virtual machine, and add additional storage to Zimbra, one partition for index and one for store.

Which is the best to go for reliability, performance, and stability?