Method Flush implementation
Write cach e setting after replication
GUI action
The replication
manager automatically sets
thesourcedisk
to write-though mode and
ensures the flush is completed before starting
the replication.
Job
You must include job commands to set the
source disk to write-through mode and wait
for the flush to complete before starting the
replication.
CLUI
You must issue CLUI commands to set the
source disk to write-through mode and wait
for the flush to complete before starting the
replication.
When replication is completed, the controller
software automatically sets the source disk
andpreallocatedcopy(convertedcontainer)
to write-back mode.
If you want the source disks or copies to be
in write-through mode, you must explicitly
set them.
This feature is controller-software version dependent. See controller software features - local replication.
See also virtual disk containers.
Snapclone FAQ
• How can I t
ell a snapclone from other types of virtual disks?
Because snapclones are independent virtual disks, they are identified as original (active) virtual
disks. This distinguishes them from snapshots, but not from other independent virtual disks.
See virtual disks types.
• How long
does it take to create a snapclone?
Asnapcl
one requires only a matter of seconds to create, no matter how large the source. However,
the s napclone does not become an independent virtual disk until unsharing is completed.
• What is snapclone normalization or unsharing?
Normali
zation or uns h aring is a snapclone background process. See virtual disks normalization.
• When can a host read from or write to a snapc lon e?
A host can immediately read from and write to a snapclone, even during the unsharing process.
• After I
create a snapc lon e, can I delete th e source virtual disk?
Yes. However, you cannot delete the source virtual disk until the background unsharing process is
completed. Once the snap clone is an independent virtual disk, you can delete the source.
Snapclone g uidelines
The following guidelines apply to snapclone virtual disks:
• The a rray must have a local replication license. See replication licenses overview.
• A snapclone can be in a different disk group than the source. (A snapclone is created in the
same disk group as its source , unless specified otherwise.)
• The redundancy (Vraid) level of a snapclone can be the same, lower, or higher than the source.
See redundancy level ( Vraid).
• Untilasnapcloneisnormalized,anothersnapcloneofthesamesourcecannotbecreated.See
normalization.
Snapclones cannot be created when the disk to be replicated is:
• A snapshot
• A disk that has a snapshot
• In the process of normalizing or being deleted
Sna
pshots
Snapshot replication of a virtual disk instantly creates a virtual, point-in-time co py of the disk. The c opy is
cal
led a snapshot. See also virtual disks snapshot types and snapshot FAQ.
HP StorageWorks Replication Solutions Manager 4.0.1
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