Thin Image host access and pair status

Thin Image User Guide

Version

9.8.6

Audience

anonymous

Part Number

MK-98RD9020-16

The status of Thin Image (HTI) pairs depends on whether the hosts can read from or write to the Thin Image pair P-VOL or S-VOLs.

The following table explains the host access and pair status for snapshot pairs.

HTI pair status	P-VOL		S-VOL
HTI pair status	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	Yes¹	Yes
COPY(RS-R) or RCPY	Yes²	Yes	No	No
PSUE	Yes	Yes	No	No
1: When the cascade attribute is disabled for the pair, access to the S-VOL might not be available if the usage rate of the pool to which the P-VOL belongs is 100%. 2: The data of the S-VOL can be read when pairs are restored. Legend Yes: Hosts can access the volume No: Hosts cannot access the volume

CAUTION:

If a host uses a software application to monitor Thin Image pair volumes other than Thin Image, 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.