| 1 |
William Kenworthy wrote: |
| 2 |
> What are you measuring the speed with - hdparm or rsync or ? |
| 3 |
> |
| 4 |
> hdparm is best for profiling just the harddisk (tallks to the |
| 5 |
> interface and can bypass the cache depending on settings, rsync/cp/?? |
| 6 |
> usually have the whole OS storage chain including encryption affecting |
| 7 |
> throughput. Encryption itself can be highly variable depending on |
| 8 |
> what you use and usually though not always includes compression before |
| 9 |
> encryption. There are tools you can use to isolate where the slowdown |
| 10 |
> occurs. atop is another one that may help. |
| 11 |
> |
| 12 |
> [test using a USB3 shingled drive on a 32 it arm system] |
| 13 |
> |
| 14 |
> xu4 ~ # hdparm -Tt /dev/sda |
| 15 |
> /dev/sda: |
| 16 |
> Timing cached reads: 1596 MB in 2.00 seconds = 798.93 MB/sec |
| 17 |
> Timing buffered disk reads: 526 MB in 3.01 seconds = 174.99 MB/sec |
| 18 |
> xu4 ~ # |
| 19 |
> |
| 20 |
> BillK |
| 21 |
> |
| 22 |
|
| 23 |
I copied that from a fair sized file in rsync's progress output. I just |
| 24 |
picked one that was the highest in the last several files that were on |
| 25 |
the screen, without scrolling back. No file system with compression |
| 26 |
since compressing video files doesn't help much. Just ext4 on encrypted |
| 27 |
LVM on a single partition. |
| 28 |
|
| 29 |
I tell you tho, this new drive is filling up pretty darn fast. I got to |
| 30 |
build a NAS or something here. Thing is, how to put it somewhere it is |
| 31 |
protected and all. A NAS won't exactly fit in my fire safe. :/ Bigger |
| 32 |
fire safe maybe???? o_O |
| 33 |
|
| 34 |
Dale |
| 35 |
|
| 36 |
:-) :-) |
| 37 |
|
| 38 |
P. S. Just made three more jars of pepper sauce. Must have that to go |
| 39 |
with peas and cornbread. :-D |
Archives