|
Parity Group ID
|
Parity group
numbers
|
|
Top LDEV ID
|
External volume's
top LDEV ID
|
|
Top LDEV Name
|
External volume's
top LDEV name
|
|
Cache Mode
|
- Enable: Write data
from the host is propagated asynchronously.
- Disable: Write data
from the host is propagated synchronously.
When nondisruptive migration is specified as the
Attribute, the cache modes are
displayed:
- Through: Write and
read requests are transferred from the host to the external
storage system. The local system's cache is not used.
- Write Sync: Write
data is reflected from the host to the external storage
system synchronously. If read or write is performed while
data is being written to the external storage system, the
read or write operation waits until the ongoing write
operation is completed.
- Check
Condition (VSP E series): Indicates that write or read
commands from the host were rejected.
- Pending
(VSP E series): Holds write and read commands from
the host.
While cache mode
operations are in progress, status is reported for cache mode
changes:
- (Changing):
Transition to the displayed cache mode is in progress.
- (Error): Transition
to the displayed cache mode has failed and maintenance work
is required.
See Cache use and external storage performance
for more information.
|
|
Inflow Control
|
- Enable: Write data
is limited or prevented from being written to cache memory
when the write operation cannot be performed.
- Disable: Write data
is allowed to be written to cache when the write operation
cannot be performed.
|
|
Path Mode
|
External path of
the external volume:
- Single: One
external path is used, with alternate paths available in
case of failure.
- Multi: Multiple
paths are used at the same time.
- ALUA: Like Multi,
all paths are used; however, they are not used when
connected to ports in Passive status. For more
information, see External paths.
|
|
ALUA Permitted
|
Whether ALUA can
be set as the Path Mode in the local storage system:
- Enable: ALUA Mode
is used.
- Disable: ALUA Mode
is not used.
|
|
Load Balance Mode
|
I/O load balance
system for external storage system:
- Normal Round-robin:
Load balance is performed in round-robin system.
- Extended
Round-robin: Load balance system is automatically switched
for sequential I/O and random I/O.
- Disable: I/O
operation is performed with a single path, without load
balance.
|
