Le 05/02/10 01:00, Brian a écrit :
From what I saw, ZFS scales terribly well with multiple cores.Thanks for the reply. Are cores better because of the compression/deduplication being mult-threaded or because of multiple streams? It is a pretty big difference in clock speed - so curious as to why core would be better. Glad to see your 4 core system is working well for you - so seems like I won't really have a bad choice.Why avoid large drives? Reliability reasons? My main thought on that is that there is a 3 year warranty and I am building raidz2 because I expect failure. Or are there other reasons to avoid large drives? I thought I understood the overhead.. The write and read speeds should be roughly that of the slowest disk? Thanks. If you want to send/receive your filesystems through ssh to another machine, speed matters since ssh only uses one core (but then you can always use netcat). On Xeon E5520 running at 2.27 GHz we achieve around 70/80 MB/s ssh throughput. For dedup, you want lots of RAM and if possible a large and fast ssd for L2ARC. Someone on this list was asking about estimates on ram/cache needs based on blocksizes / fs size / estimated dedup ratio. Either I missed the answer or there was no really simple answer (other than more is better, which always stays true for ram and l2arc). Anyway, we tested it and were surprised about the quantity of reads that ensue. Arnaud |
_______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
