HP Store Once Backup System 4900 Installation and Configuration Guide

Capacity expansion
When expanding capacity, it is very important not only to install the expansion kits in the correct
sequence, but also to install the licenses for the expansion kits in the correct sequence. The HP
StoreOnce 4900 Backup system requires:
• The first disk enclosure to be expanded first. Up to 5 x 44TB disk expansion kits may be
added, but be certain to install the disks in the correct bays as instructed on the disk enclosure
labels, and apply the correct licenses for these kits.
• If further capacity is required, purchase and install the 60TB expansion kit which is a separate
disk enclosure and requires a different license type. The license must be applied before further
expansion can occur.
• For further capacity expansion, use 5 x 44TB disk expansion kits in the second disk enclosure,
taking care to install the disks in the correct bays as instructed on the disk enclosure labels,
and apply the correct licenses for these kits.
When adding expansion 1 through 5 for each enclosure, the 44TB license is required to be added
for each expansion.
If only enclosure with its 15 disks is added to the system, the 60TB license is required to be added.
Problems expanding storage
Discover storage fails
The hardware discover storage command will fail if:
• A previous discover storage command is already running.
• There is no storage to be added.
• There are insufficient expansion licenses applied to allow the entire expansion to complete
(in this case, no expansion will take place until sufficient licenses are present for all added
storage).
• The storage is installed in the wrong disk bay locations for this expansion set.
• There are any failed or predictive fail disks in either the existing or newly added storage.
• The SAS cabling to the disk enclosures is incorrect.
• There are any “foreign” LUNs already present on the attached storage.
Add storage fails
The hardware add storage command will fail if:
• There is an outstanding discover or add command in progress.
• Any of the error conditions described above for the hardware discover storage
command have not been rectified.
Cannot connect to a NAS share
The following sequence will cause problems when connecting to a NAS share.
1. Create an NFS share and mount it on a Linux box.
2. Delete the share on the HP StoreOnce Backup system without unmounting it from the Linux
box.
3. Recreate the share again with the same name.
In this scenario, the Linux client will assign a new set of inodes to the new share, but when trying
to access the old mount point it will use the previous set of inodes and will therefore not manage
to connect.
Problems expanding storage 115