If you are facing performance issue / running out of space while running multiple VMs.
You can either upgrade to better storage system or install additional hdd.
To add new hdd to citrix xenserver, you need to follow below mentioned steps.
1)Find the disk ID
cat /proc/partitions
e.g sdb
2)Find the disk ID
ls /dev/disk/by-id
e.g for sdb:- scsi-SATA_WD2502ABYS-23B7_WD-WCAT1J013665
3)Find host-uuid
xe host-list
4)Create Repo
xe sr-create content-type=user device-config:device=/dev/disk/by-id/DISK-ID host-uuid=HOST-UUID name-label="Local Storage 2" shared=false type=lvm |