>but there may not be filesystem space for double the data. >Sounds like there is a need for a zfs-defragement-file utility perhaps? >Or if you want to be politically cagey about naming choice, perhaps, >zfs-seq-read-optimize-file ? :-)
For Datawarehouse and streaming applications a "seq-read-omptimization" could bring additional performance. For "normal" databases this should be benchmarked... This brings me back to another question. We have a production database, that is cloned on every end of month for end-of-month processing (currently with a feature on our storage array). I'm thinking about a ZFS version of this task. Requirements: the production database should not suffer from performance degradation, whilst running the clone in parallel. As ZFS does not clone all the blocks, I wonder how much the procution database will suffer from sharing most of the data with the clone (concurrent access vs. caching) Maybe we need a feature in ZFS to do a full clone (speak: copy all blocks) inside the pool, if performance is an issue.... just like the "Quick Copy" vs. "Shadow Image" -features on HDS Arrays... ------------------------------------------------------------------------- This message is intended for the addressee only and may contain confidential or privileged information. If you are not the intended receiver, any disclosure, copying to any person or any action taken or omitted to be taken in reliance on this e-mail, is prohibited and may be un- lawful. You must therefore delete this e-mail. Internet communications may not be secure or error-free and may contain viruses. They may be subject to possible data corruption, accidental or on purpose. This e-mail is not and should not be construed as an offer or the solicitation of an offer to purchase or subscribe or sell or redeem any investments. ------------------------------------------------------------------------- _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
