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rsync -v -axHS --delete --no-whole-file /fs/a/ /fs/b/I was running
dstat which reported (note
that the disk transfer rate reported is twice the actual
transfer rate):
----total-cpu-usage---- -dsk/total- -net/total- ---paging-- ---system-- usr sys idl wai hiq siq| read writ| recv send| in out | int csw 24 35 0 41 0 0| 63M 62M|1998B 1505B| 0 0 |1252 4270 29 38 0 31 1 1| 63M 67M|1938B 1446B| 0 0 |1244 4326 11 15 0 73 0 1| 26M 63M|2313B 1650B| 0 0 | 660 1888 26 48 0 24 1 1| 75M 62M|1938B 1446B| 0 0 |1435 5042 29 43 0 25 1 2| 73M 66M| 11k 28k| 0 0 |1434 4998 31 43 0 24 1 1| 70M 70M| 11k 6618B| 0 0 |1378 4764 28 51 0 20 0 1| 70M 64M| 105k 9.9k| 0 0 |1497 4898 30 36 0 26 4 4| 67M 70M| 101k 42k| 0 0 |1736 5217 25 47 0 24 1 3| 71M 66M| 28k 3112B| 0 0 |1423 4874 28 49 0 20 1 2| 72M 71M|4252B 4952B| 0 0 |1424 4885 27 46 0 24 2 1| 73M 66M|3078B 3286B| 0 0 |1422 4937 30 42 0 27 0 1| 71M 71M|3440B 6034B| 0 0 |1515 4856 28 48 0 23 1 0| 73M 72M|2283B 1609B| 0 0 |1407 4895 24 42 0 32 0 2| 73M 70M|4270B 2044B| 0 0 |1402 4864 36 36 0 26 2 0| 72M 70M|2374B 1974B| 0 0 |1381 4821 40 36 0 24 0 0| 68M 68M|2012B 1518B| 0 0 |1331 4613 28 38 0 31 0 3| 66M 66M|1968B 1463B| 0 0 |1293 4514 27 34 0 38 0 1| 62M 62M|2841B 1716B| 0 0 |1229 4203 22 50 0 26 1 1| 66M 63M|1860B 1439B| 0 0 |1307 4410 31 25 0 42 1 1| 57M 60M|2526B 2070B| 0 0 |1142 3897 28 50 0 21 0 1| 73M 71M|1946B 1518B| 0 0 |1417 4879 28 49 0 22 1 0| 67M 67M|2200B 1584B| 0 0 |1305 4509 32 35 0 32 1 0| 69M 68M|1963B 1380B| 0 0 |1322 4596 27 50 0 23 0 0| 72M 73M|1800B 1380B| 0 0 |1393 4808 22 45 0 32 0 1| 66M 65M|2314B 1932B| 0 0 |1307 4493 25 43 0 32 0 0| 59M 59M|2012B 1518B| 0 0 |1163 4033 10 23 0 67 0 0| 27M 57M|2012B 1518B| 0 0 | 644 2021 25 48 0 26 0 1| 66M 55M|1963B 1380B| 0 0 |1311 4429 34 39 0 26 0 1| 73M 71M|1800B 1380B| 0 0 |1410 4893 32 44 0 21 1 2| 73M 80M|2314B 1932B| 0 0 |1438 4931 38 43 0 19 0 0| 73M 77M|2150B 1584B| 0 0 |1411 4910 26 48 0 24 1 1| 73M 76M|2128B 1643B| 0 0 |1418 4939 28 45 0 24 2 1| 72M 79M|2379B 1584B| 0 0 |1399 4820 32 44 0 23 1 0| 65M 68M| 19k 28k| 0 0 |1506 4681 37 47 0 13 1 2| 70M 71M|5582B 9936B| 0 0 |1687 4963 30 44 0 25 0 1| 71M 67M|2788B 3654B| 0 0 |1459 4798This was while updating some directories containing mostly large files (large photographs, RPM files), and it was quite impressive. The partitions involved were on the inner cylinders of a 500GB drive and could do about 50MB/s and the reported average of around 35MB/s is pretty good considering it is through the filesystem doing simultaneous reading and writing (obviously not on the same drive).
