Ian Murdock wrote: > Tim, > > Great stuff. I'm going to respond in smaller chunks, to keep subtopics > in their own subthreads. > > Tim Foster wrote: >> You might be interested in reading Eric's post at: >> http://blogs.sun.com/erickustarz/entry/zfs_on_a_laptop >> >> It has more things we might want to keep in mind: >> >> * set "copies" > 1 for the root filesystem (and anything the user cares >> about on a single-disk installation, obviously decided automatically as >> a function of total available disk-space, user-override allowed of >> course) >> * set compression = on > > Nice! > > Given the size of today's laptop disks, I don't think > it's at all unreasonable for copies to be (at least) 2 for all blocks, > particularly with compression enabled by default too (though as you > mention, it should be easy to turn it off if desired (and should be > automatically turned off if free space is below a certain threshold). > > How does the system respond if it finds a bad block? Ideally, it > puts a copy somewhere else and keeps going, though if it runs > into this enough times, the user should be warned > (since it probably indicates impending catastrophic failure). > > Anywhere I can find numbers for 1. typical space savings; and > 2. typical performance degradation when compression is on, so > I have a better idea of the tradeoff? > >> A commenter to Eric's post asks about potential impacts to battery-life >> these may have - I've absolutely no idea, but if someone wants to send >> me a new laptop and a stopwatch, I'll check it out. > > I would think the battery impact of reading the block from the disk > would far outweigh the battery impact of decompressing its contents, > but that's just a guess. > > -ian
I would think that the main problem with zfs is it's very high memory requirements. We would have to make it very clear to users why they need so much memory to run OpenSolaris. That said, I believe that zfs is the way to go. Gary _______________________________________________ indiana-discuss mailing list [email protected] http://opensolaris.org/mailman/listinfo/indiana-discuss
