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Another I/O speed comparison thread.
Other than the GVH category, I think we should have the IO-Racing category as well.
@eLohkCalb I just wanna get Confirm if it's a SSD one.
dd if=/dev/zero of=test bs=1M count=2048 oflag=dsync
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 48.4221 s, 44.3 MB/s
It's only have 44.3MB I/O??
How about asking the host to fix it, before coming here?
@Makenai Yes,i asked,But ubiquityhosting's guy replay me that they don't guarantee the disk speed.
@danefy You're testing it wrong, replace oflag=dsync with conv=fdatasync
@rm_
dd if=/dev/zero of=test bs=1M count=2048 conv=fdatasync
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 8.02768 s, 268 MB/s
much better now
here is the SSD 10 base from ramnode
dd if=/dev/zero of=test bs=1M count=2048 conv=fdatasync
2048+0 records in
2048+0 records out
2147483648 bytes (2.1 GB) copied, 1.63238 s, 1.3 GB/s
Both SSD 10 base vps, why Ramnode one is 5 times faster than ubiquityhosting one?
Mind telling the difference?
These two hosts probably have different node setups.
https://romanrm.net/dd-benchmark
OMG ONLY 268MB/s THAT'S TERRIBLE!!!!! TREATEN WITH CHARGEBACK AND WRITE A BAD REVIEW!!!!!!!
Now seriously, there are many possible reasons for the differences.
First one of the hosts might be using a RAID card with large RAM buffer which buffers the writes and to you it seems the writes are happening faster than the SSDs could handle.
Then there are different types of SSDs. Some SSDs have a controller chip which compresses the data that is being written, so when you send it zeroes, the zeroes get compressed and much less data is really written, so the result is that the write seems much faster than the flash chips could really handle if it was all random data.
And then... there could be other ways to artificially improve the DD write speed if a host really wanted to. But i hope nobody is doing this.
The I/O is not even close to prometeus' SSD. I've never thought about ubiquityhosting at all. I know abusers prefer ubiquityhosting and psychz so I never touch them. why I know this? I'm a bloody Chinese.