On Feb 26, 2010, at 8:25 PM, Eric D. Mudama wrote: > On Thu, Feb 25 at 20:21, Bob Friesenhahn wrote: >> On Thu, 25 Feb 2010, Alastair Neil wrote: >> >>> I do not know and I don't think anyone would deploy a system in that way >>> with UFS. >>> This is the model that is imposed in order to take full advantage of zfs >>> advanced >>> features such as snapshots, encryption and compression and I know many >>> universities >>> in particular are eager to adopt it for just that reason, but are stymied >>> by this >>> problem. >> >> It was not really a serious question but it was posed to make a point. >> However, it would be interesting to know if there is another type of >> filesystem (even on Linux or some other OS) which is able to reasonably and >> efficiently support 16K mounted and exported file systems. >> >> Eventually Solaris is likely to work much better for this than it does >> today, but most likely there are higher priorities at the moment. > > I agree with the above, but the best practices guide: > > http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#ZFS_file_service_for_SMB_.28CIFS.29_or_SAMBA > > states in the SAMBA section that "Beware that mounting 1000s of file > systems, will impact your boot time". I'd say going from a 2-3 minute > boot time to a 4+ hour boot time is more than just "impact". That's > getting hit by a train.
The shares are more troublesome than the mounts. > > Might be useful for folks, if the above document listed a few concrete > datapoints of boot time scaling with the number of filesystems or > something similar. Gory details and timings are available in the many references to CR 6850837 http://bugs.opensolaris.org/bugdatabase/view_bug.do?bug_id=6850837 -- richard ZFS storage and performance consulting at http://www.RichardElling.com ZFS training on deduplication, NexentaStor, and NAS performance http://nexenta-atlanta.eventbrite.com (March 16-18, 2010) _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
