If you're trying to extend your group's allocation but are seeing something like:
(puma) [netid@junonia ~]$ xdisk -c expire -d 1
invalid request_days: 1
for every value you enter, your xdisk has likely reached its maximum time limit. To check, go to portal.hpc.arizona.edu, click Manage XDISK, and look at the box next to Duration. If you see 300, your allocation cannot be extended further.
If your allocation is at it's limit, you will need to back up your data to external storage (e.g., a local machine, lab server, or cloud service). Once your xdisk has expired (either by expiring or through manual deletion), you can immediately create a new allocation and restore your data. Detailed xdisk information can be found on our Storage page. You may also want to look at our page on Transferring Data