Dale wrote: > 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 > > :-) :-) > >
Well, 2.5 days later, first backup done. Then I had to restart to update the changes made in the past couple days that rsync didn't catch. When that got done, I wanted to close the drive and unhook it but I'm getting that 'device in use' message. Well, after some digging, I found that extlazyinit process running and if memory serves me, that is the process that creates the file system in the background. I ran into that before. I think it was copying the files as fast as it was able to create the file system to put it on. I'll know next time I do backups. If this thing ever lets me disconnect the drive. Oh. Filesystem Size Used Avail Use% Mounted on /dev/mapper/10tb 9.1T 7.5T 1.6T 83% /mnt/10tb I don't see that lasting to long. :/ Yup, gotta come up with a plan. Dale :-) :-)
