Hewlett Packard Enterprise HPE XP7, User Manual, Page: 31 / 311

5. If you restore a Fast Snap pair in "PSUS" status, snapshot data is overwritten to the primary volume.
The pair status is "COPY(RS-R) or RCPY" when the restore process is in progress. The pair status is
"PAIR" after the restore process finishes.
6. The pool can only contain data of predetermined capacity. If the total capacity of snapshot data in the
pool exceeds the pool capacity, the status of the Fast Snap pair becomes "PSUE." In addition, the pair
status changes to "PSUE" if a failure occurs during the restore process or if the pool usage rate
reaches 100 percent. Even if the restore process is not in progress, the pair status may change to
"PSUE" when a failure occurs. When snapshot data is stored in the THP pool, the timing of changing
to PSUE is determined by the setting in "Suspend FS pairs when the deletion threshold is exceeded"
in RWC, or by the setting specified by using the
raidcom modify pool -suspend_tipair
<yes|no>
command in RAID Manager. For details, see the HPE XP7 Provisioning for Open Systems
User Guide .
Fast Snap host access and pair status
The following table explains the host access and pair status for snapshot pairs.
FS pair status P-VOL S-VOL
Read Write Read Write
SMPL Yes Yes No No
SMPL(PD) or SMPP Yes Yes No No
COPY Yes Yes No No
PAIR/PFUL Yes Yes No No
PSUS/PFUS Yes Yes Yes Yes
COPY(RS-R) or RCPY Yes Yes No No
PSUE Yes Yes No No
Legend
Yes: Hosts can access the volume
No: Hosts cannot access the volume
CAUTION: If a host uses a software application to monitor Fast Snap pair volumes other than Fast
Snap, the S-VOL status determines if the software application ends abnormally. For example, if the
S-VOLs are in a status other than "PSUS" and "PFUS," the host can reject access.
If a host connects to at least two ports, an abnormality can occur with ports that are not connected
to S-VOLs rejecting access from hosts. To resolve these issues, close the software application that
monitors volumes.
Workflow for Fast Snap pair status changes
Fast Snap host access and pair status 31