William Kenworthy wrote: > What are you measuring the speed with - hdparm or rsync or ? > > hdparm is best for profiling just the harddisk (tallks to the > interface and can bypass the cache depending on settings, rsync/cp/?? > usually have the whole OS storage chain including encryption affecting > throughput. Encryption itself can be highly variable depending on > what you use and usually though not always includes compression before > encryption. There are tools you can use to isolate where the slowdown > occurs. atop is another one that may help. > > [test using a USB3 shingled drive on a 32 it arm system] > > xu4 ~ # hdparm -Tt /dev/sda > /dev/sda: > Timing cached reads: 1596 MB in 2.00 seconds = 798.93 MB/sec > Timing buffered disk reads: 526 MB in 3.01 seconds = 174.99 MB/sec > xu4 ~ # > > BillK >
I copied that from a fair sized file in rsync's progress output. I just picked one that was the highest in the last several files that were on the screen, without scrolling back. No file system with compression since compressing video files doesn't help much. Just ext4 on encrypted LVM on a single partition. I tell you tho, this new drive is filling up pretty darn fast. I got to build a NAS or something here. Thing is, how to put it somewhere it is protected and all. A NAS won't exactly fit in my fire safe. :/ Bigger fire safe maybe???? o_O Dale :-) :-) P. S. Just made three more jars of pepper sauce. Must have that to go with peas and cornbread. :-D
