On 3/1/21 10:37 PM, Frederic Muller wrote:
I bought a rather cheap but not so cheap 1TB SSD drive advertised at rw
speeds of 450MB/s. I have 2 thinkpads, one X1 3rd gen and one X1 6th
gen. Now here is what happened:
1. On 3rd gen laptop with F32 I tested (and made a full backup) : 45MB/s
(NTFS)
2. I installed a the "brand new" F33, restored my backup and...: 85MB/s
(NTFS)
3. Since I was a tad late updating I told myself let's do it on the 6th
Gen too. Did a full backup on F32 at : ~400MB/s!!! (NTFS and ext4 - did
several backups)
4. I installed a fresh new F33 and the restore speed was then... 50MB/s
:-( (ext4)
5. I just restested the disk on the 3rd gen laptop and I am now (ext4)
at 45MB/s (I also just upgrade my BIOS to its latest version for this
test).
So I was wondering if there was any logical explanations and things I
could do to ensure I use the disk at its maximum speed.
There are a lot of factors and you've left out some details. Is this
internal or external. If external, then USB2 or USB3 (or something
else)? What are you using for the backup and restore? Even though
there is almost no seek delay, reading and writing lots of random files
involved a lot of IO operations. If you really want to test the speed,
you should use something like dd using a big blocksize.
dd if=/dev/zero of=/test.dat bs=8M count=1K
dd if=/test.dat of=/dev/null bs=8M
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