Hi Richard, > Someone in the community was supposedly working on this, at one > time. It gets brought up about every 4-5 months or so. Lots of detail > in the archives.
Thank you for the pointer and sorry for the noise. I will definitely browse the archives to find out more regarding this question. Bob and Darren, thank you as well for your comments. I don't expect it to be easy to optimize RAIDZ for random read I/O, but I do not agree with the argument that caching heals all I/O problems. Yes, it would be desirable to always have so large a cache to eliminate almost all read-I/O, but those of us who are responsible for deploying such systems will know that physical read I/O performance does matter for random access patterns in particular, but also for more sequential access patterns on ZFS due to the inherent fragmentation that comes with COW (plus relevance for cache warmup times etc). In short, I consider this optimization approach worthwhile exploring, but I don't think I'll be able to do this myself. I would appreciate any pointers to background information regarding this question. Thank you, Nils _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
