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Comment on Data HDD with SSD catch drive

rambos@lemm.ee ⁨4⁩ ⁨months⁩ ago

I have managed to copy with rsync and getting 180 MB/s. I guess my initial assumption was wrong, HDD is obviously not bottleneck here, it can get close to ISP speed. Thank you for pointing this out, Ill do more testing these days. Im kinda shocked because I never knew HDD can be that fast. Gonna reread all the comments as well

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not_fond_of_reddit@lemm.ee ⁨4⁩ ⁨months⁩ ago
The cool thing about rsync is that it goes ”BRRRRRRRRR!” like a warthog… the plane… and it can saturate the receiving drive or array depending on your network and client. And getting 180 with rsync… on a SATA drive, can’t really hope for more.

And you can run a quick n dirty test is using dd

$> dd if=/dev/zero of=1g-testfile bs=1g count=1

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- rambos@lemm.ee ⁨4⁩ ⁨months⁩ ago
  Thx. Ive seen dd commands in guides how to test drive speed, but I’m not sure how can I specify what drive I want to test. I see I could change “if” and “of”, but don’t trust myself enough to use my own modified commands before understanding them better. Will read more about that. Honestly I’m surprised drive speed test is not easier, but its probably just me still being noob xD
  
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  - not_fond_of_reddit@lemm.ee ⁨4⁩ ⁨months⁩ ago
    Let’s say you want to test a drive that is mounted on /tmp… you just cd into that directory and you can use my example.
    
    You can use
    
    $> df -h or $> mount
    
    to check how your drive is mounted in the OS Most ”default ” installations will have 1-4 partitions and / being partition 3 or 4.
    
    So if you look at the mount command and / is /dev/sdX3 (where X can be a-z depending on how many drives you have connected) and no other mounts are in the output then every directory under / is on that drive… so you can run my example from your home-directory if you fancy that.
    
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    rambos@lemm.ee ⁨4⁩ ⁨months⁩ ago
    Thank you a lot for being patient with me :D
    
    dd if=/dev/zero of=1g-testfile bs=1G count=1 1+0 records in 1+0 records out 1073741824 bytes (1.1 GB, 1.0 GiB) copied, 4.62269 s, 232 MB/s
    
    This HDD is obviously working fine and much faster than I thought it can. I guess I have to find bottleneck elswhere
    
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ShortN0te@lemmy.ml ⁨4⁩ ⁨months⁩ ago
The limitation of HDDs was never sequential Read/Write when it comes to day to day use on a PC.

The huge difference to an SSD is when data is written or read not sequentially, often referred to random I/O.

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