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matrox65
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Problem with External USB Drive

Post by matrox65 » Jun 14, 2019 9:22 am

Hello,
i use an 6TB USB Disk that was direct attach over USB3 to my BackUp Server. I was little frustrated why Rotated Hard Drive Option makes my Save slower. I have make two scenarios:

BackUp Repository with "Use per-VM backup files" enabled
- Read Speed 140MB/s
- Transfer Speed 115MB/s

BackUp Repository with "Rotated Hard Drive" enabled
- Read Speed 120MB/s
- Transfer Speed 70MB/s

For me im not understand why i can not use "per-VM backup files" with Rotated Hard Drives.

best regards, Juerg

matrox65
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Re: Problem with External USB Drive

Post by matrox65 » Jun 14, 2019 12:16 pm

Or what i can do for more performance?

best regards, Juerg

foggy
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Re: Problem with External USB Drive

Post by foggy » Jun 14, 2019 1:10 pm

Hi Juerg, per-VM files are one of the limitations of the repository backed up by rotated drives:
You cannot store per-VM backup files on backup repositories with rotated drives.
And actually you even cannot enable per-VM backup chains on a rotated drives repository.

matrox65
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Re: Problem with External USB Drive

Post by matrox65 » Jun 14, 2019 1:47 pm

Yes, that im know. But im wonder why my BackUp with Rotated Disk needs nearly 2x times longer as with per VM BackUp.

foggy
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Re: Problem with External USB Drive

Post by foggy » Jun 14, 2019 5:13 pm

It could be explained by the increased number of parallel streams after enabling per-VM chains.

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