G'Day Anil, On Wed, Jun 18, 2008 at 07:37:38PM -0700, Anil Jangity wrote: > Why is it that the read operations are 0 but the read bandwidth is >0? > What is iostat > [not] accounting for? Is it the metadata reads? (Is it possible to > determine what kind of metadata > reads these are?
This could just be rounding - what interval did you use for zpool? I believe 1 read per 5 seconds will be shown as '0' (rounded from 0.2); the read bandwidth in your output is very small, suggesting that something like this may be happening. Brendan > > I plan to have 3 disks and am debating what I should do with them, if I > should do a > raidz (single or double parity) or just a mirror. > > As per some of the blog entries, I've been reading that raidz may not be > that suitable for lot of > random reads. > > With the # of reads below, I don't see any reason why I should consider > that. I would like to > proceed with doing a raidz with double parity, please give me some feedback. > > Thanks, > Anil > > capacity operations bandwidth > pool used avail read write read write > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.67G 2 19 52.3K 198K > data2 58.2G 9.83G 3 44 60.5K 180K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 21 11.3K 151K > data2 58.2G 9.83G 0 44 158 140K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 18 436 117K > data2 58.2G 9.83G 0 44 203 149K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 20 1.49K 167K > data2 58.2G 9.83G 0 44 331 154K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 21 791 166K > data2 58.2G 9.83G 0 46 199 167K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 25 686 364K > data2 58.2G 9.83G 0 45 35.9K 152K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 19 698 129K > data2 58.2G 9.83G 0 43 81 146K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 19 1.45K 141K > data2 58.2G 9.82G 0 44 59 139K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 19 436 124K > data2 58.2G 9.82G 0 43 71 145K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 21 412 150K > data2 58.2G 9.82G 0 41 114 138K > ---------- ----- ----- ----- ----- ----- ----- > data1 41.6G 5.66G 0 20 1.35K 128K > data2 58.2G 9.82G 0 47 918 160K > ---------- ----- ----- ----- ----- ----- ----- > > > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss -- Brendan [CA, USA] _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
