> From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- > boun...@opensolaris.org] On Behalf Of James > > I assume while a 2TB 7200rpm drive may have better sequential IOPS than a > 500GB, it will not be double and therefore,
Don't know why you'd assume that. I would assume a 2TB drive would be precisely double the sequential throughput of a 500G. I think if you double the surface density in two dimensions (a flat surface) you end up with 4x the storage capacity. Hence, a 2T drive should have 2x the 1-dimensional track density, and should be 2x faster sequential throughput than a 500G drive, with all other things being equal. > Our IO is random small(4kB) read/write but I expect ZFS to convert the writes > to sequential and the L2ARC to intercept a lot of the reads. (assumes low > latency, high iop ZIL SLOG device). If you truly have random reads, then your L2ARC can't help you much. Your L2ARC can only help if you have a lot of repeated reads clustered in hot areas of the storage pool. ARC is based on "Frequently Used" and "Recently Used" _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
