bsousa wrote: > ARC Size Breakdown: > Most Recently Used Cache Size: 88% 4078 MB (p) > Most Frequently Used Cache Size: 11% 550 MB (c-p) > >
Okey, so 88% of the ARC contents have only been hit once, and 11% are being hit over and over. > So now i'm even more confused...in the ARC Efficency we see : > > Data Demand Efficiency: 52% > Data Prefetch Efficiency: 58% > > is this a good thig or a bad thing? > This is actually good. It means that 52% of the cache hits are blocks your asking for again, and 58% are blocks you've never asked for but were prefetched ahead of time. On a lot of server systems you'll see prefetch efficiency really low... like 10% or lower. In those cases the additional I/O may not be worth it, however in your case 58% of the cache hits are prefetched bits that you don't need to do I/O to disk for...which is kool. So I'd recommend leaving prefetch alone. :) benr. _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
