[SCALE 24.10.2.2] Is it Possible to Manually Set Custom iSCSI Extent Block Size?

TrueNAS General
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Hello!

Is it possible to somehow specify a value for the Logical Block Size that isn’t listed in the dropdown menu? Maybe via the API?

For example: 8192b

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Probably no?

Never heard of a device with a logical block size of 8192, only ever 512 or 4k.
Is there such a thing?

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Some modern SSDs have 8k physical block sizes and benefit from setting ashift=13 (8192b), yes.

But I’m talking about an iSCSI virtual block device, so that’s not really relevant. I’m just trying to figure out if I can customize the extent block size beyond what’s in the dropdown menu in a supported way.

4

I don’t think you can.

You could make a feature request.

5

Thanks for your help. Posted a feature request here: iSCSI Setup: More Options for iSCSI Extent Logical Block Size Larger than 4k (4096 bytes)

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And since the quick answer is that you’d need a use case with actual test results for the request to be considered, I think we’re back here for advice as to

  • How to set up a zvol with >4k extent from the CLI;
  • How to have the GUI manage this zvol for iSCSI sharing.
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7

Agreed.

That’s a bit out of my depth, unfortunately.