mikebounds
12 years agoLevel 6
Documents to explain what detailed features are available for each licence
Are there any documents to explain what detailed features are available for each licence, preferably a single document or article
in the "Getting Started guide" it gives a highlevel overview so it says an Enterprise licence gives
Veritas Quick I/O optionVeritas Extension for Oracle Disk Manager optionVeritas Database Storage Checkpoint optionVeritas Database FlashsnapVeritas Database Dynamic Storage Tiering
but it doesn't say what flashsnap gives you or tell you what documentation you need to refer to, to find this out. I found some information for flashsnap in the "Veritas Storage Foundation Advanced Features Administrator's Guide", but this is not very detailed - it says:
The following kinds of point-in-time copy solution are supported by the FlashSnaplicence:■ Volume-level solutions are made possible by the persistent FastResync andDisk Group Split/Join features of Veritas Volume Manager. These features aresuitable for implementing solutions where the I/O performance of theproduction server is critical.■ File system-level solutions use the Storage Checkpoint feature of Veritas FileSystem. Storage Checkpoints are suitable for implementing solutions wherestorage space is critical for:■ File systems that contain a small number of mostly large files.■ Application workloads that change a relatively small proportion of filesystem data blocks (for example, web server content and some databases).■ Applications where multiple writable copies of a file system are requiredfor testing or versioning.
This is not very clear as this reads as if Storage Checkpoint are part of flashsnap, but the "Getting Starting Guide" says these are separate features, but this doesn't really matter as Enterprise license gives you both features, but it is not clear what snapshot features and other features flashsnap gives. So for example, the Volume Admin guide lists several types of snapshots:
■ Traditional third-mirror break-off snapshots
■ Full-sized instant snapshots
■ Space-optimized instant snapshots
■ Emulation of third-mirror break-off snapshots
■ Linked break-off snapshot volumes
■ Cascaded snapshots
So which of these snapshots are made available with the flashsnap licence - the "Advanced Features" guide says
These features are suitable for implementing solutions where the I/O performance of the production server is critical.
If I/O performance is critical, then you use full snapshots such as "Traditional third-mirror break-off snapshots", rather than Copy-On-Write snapshots such as "Space-optimized instant snapshots" so that Production writes are not impacted by snapshot writes, so this would imply that flashsnap gives you "Traditional third-mirror break-off snapshots" and not "Space-optimized instant snapshots", but I am pretty sure this is not the case and I THINK that flashsnap gives you:
- Snapshots that need DCOs (generally created with "vxsnap") so you don't need Flashsnap for snapshots without DCOs (generally created with "vxassist snap". Now even though DCOs give the ability to fast resync, even if you don't need this, you may still need a DCO so for instance if you need the abiltity to create a mirror in a separate diskgroup, then you need "Linked break-off snapshot volumes", but you may never snap back, so don't need fastresync, but I think you MUST create DCO (run vxsnap prepare) for "Linked break-off snapshot volumes" and therefore I THINK you need flashsnap. So I THINK all snapshots require flashsnap apart from "Traditional third-mirror break-off snapshots"
- Diskgroup split and join
- Site awareness feature
What features are available with a licence change by version, so any docs which explain what the Enterprise license gives would be appreciated.
Mike