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Bad performance when click INCRESE PRIORITY when duplicating


HARDICKER
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I use 2 disks in drive pool. When use one single drive, the sequence reading or writing speed is about 160-240MB/s. When I change No Duplicate to 2x Duplicate, duplication start automatically.

However, the duplicate speed will drop down from 100MB/s to 20MB/s, and the physical disk usage will increase from 60% to 100%, if click "Increase Priority" button. By the way, files being duplicated is big big files.

This is awful. Hope it will be fixed.

By the way, why read striping doesn't improve any performance when reading one big 2x-duplicated file? Reading speed can never be over 250MB/s.

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14 hours ago, HARDICKER said:

However, the duplicate speed will drop down from 100MB/s to 20MB/s, and the physical disk usage will increase from 60% to 100%, if click "Increase Priority" button. By the way, files being duplicated is big big files.

By default, duplication and balancing are ran as background I/O tasks, meaning that they will slow or stop, if there is other activity on the pool.  This is so that normal usage isn't slowed down by these tasks. 

Increasing the priority means that these ***will*** interfere with normal usage, which sounds like what is going on here. 

However, once duplication is finished, it should be better. 

14 hours ago, HARDICKER said:

By the way, why read striping doesn't improve any performance when reading one big 2x-duplicated file? Reading speed can never be over 250MB/s.

It may not. Because StableBit DrivePool is a file based solution, rather than a block based one, the performance gains are going to be only so much.  Additionally, just because the file is duplicated does not mean that it will read from both copies.  If one of the disks is busy with stuff, it will read from the other disk, and only the other disk.   It's not trying to speed up the reads, but to optimize them, based on system usage. 

 

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On 1/19/2021 at 3:30 PM, HARDICKER said:

However, the duplicate speed will drop down from 100MB/s to 20MB/s, and the physical disk usage will increase from 60% to 100%, if click "Increase Priority" button. By the way, files being duplicated is big big files.

On 1/20/2021 at 5:50 AM, Christopher (Drashna) said:

Increasing the priority means that these ***will*** interfere with normal usage, which sounds like what is going on here. 

Thank you for replying.

When one thing is of high priority, it should be faster ,and OTHER things will be slower.

However, increasing the priority of duplication will slow down duplication speed ITSELF. I wonder why the duplication will be faster when in background.

 

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