Rich Freeman wrote: > On Sat, Aug 20, 2022 at 3:15 PM Dale <rdalek1...@gmail.com> wrote: >> Related question. Does encryption slow the read/write speeds of a drive >> down a fair amount? This new 10TB drive is maxing out at about >> 49.51MB/s or so. > Encryption won't impact the write speeds themselves of course, but it > could introduce a CPU bottleneck. If you don't have any cores pegged > at 100% though I'd say this isn't happening. On x86 encrypting a hard > drive shouldn't be a problem. I have seen it become a bottleneck on > something like a Pi4 if the encryption isn't directly supported in > hardware by the CPU. > > 50MB/s is reasonable if you have an IOPS-limited workload. It is of > course a bit low for something that is bandwidth-limited. If you want > to test that I'm not sure rsync is a great way to go. I'd pause that > (ctrl-z is fine), then verify that all disk IO goes to zero (might > take 30s to clear out the cache). Then I'd use "time dd bs=1M > count=20000 if=/dev/zero of=/path/to/drive/test" to measure how long > it takes to create a 20GB file. Oh, this assumes you're not using a > filesystem that can detect all-zeros and compress or make the file > sparse. If you get crazy-fast results then I'd do a test like copying > a single large file with cp and timing that. > > Make sure your disk has no IO before testing. If you have two > processes accessing at once then you're going to get a huge drop in > performance on a spinning disk. That includes one writing process and > one reading one, unless the reads all hit the cache. >
Kinda picking random reply. I finally got the full backups done and have updated a couple times, new drive and old drives. Someone mentioned atop and I gave it a try. I noticed the drive parts that is either being read from or written to show up in red and a high amount of use. After doing some google searching, red means really, really busy. Makes sense. So, the drives are apparently just maxing out. I also noticed something else. Given that my internet is so much faster now, that also puts a load on disk I/O. Heck, the internet alone can almost max out the drive I/O. On top of that I'm watching a video on my TV. So, doing backups, watching TV and downloading stuff over a really fast internet connection, no wonder things were a little slow. I also ran this on the new 10TB drive and a older SMR 8TB drive. This is about normal, ish. sdl is the 8TB and sdm is the 10TB. root@fireball / # hdparm -tT /dev/sdl /dev/sdl: Timing cached reads: 8814 MB in 2.00 seconds = 4410.88 MB/sec Timing buffered disk reads: 558 MB in 3.00 seconds = 185.76 MB/sec root@fireball / # hdparm -tT /dev/sdm /dev/sdm: Timing cached reads: 8992 MB in 2.00 seconds = 4499.72 MB/sec Timing buffered disk reads: 612 MB in 3.01 seconds = 203.47 MB/sec root@fireball / # I have some other drives that are slower and a couple that are faster. So, I guess it about averages out. I have another question. I notice that the drive activity light stays on a lot more, downloading/uploading faster etc etc. Will that cause my drives to age faster or is that designed in? I try to get the higher grade of drives, avoid those built for light duty stuff. Of course, they not designed to be used by NASA either. :/ By the way, that new backup drive, filling up fast. My storage partition is too. This fast internet is causing, issues. ROFL Time to hunt up a deal on another 8TB or 10TB drive to add on. Dang, my case is about full. I really need a NAS or something. :-D Dale :-) :-)
