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TigerJr
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Joined: 19 Jun 2007
Posts: 540
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 Posted: Wed Dec 27, 2017 1:24 pm Post subject: loop0 in iscsi-target is blockio or fileio? |
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Subject as a question. I don't understand loop fs mounted from file is it block device or not?
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NeddySeagoon
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Joined: 05 Jul 2003
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| Posted: Wed Dec 27, 2017 2:07 pm Post subject: |
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TigerJr,
Its a block device in a file, so its one layered over the other.
Consider that the file may be fragmented on the HDD.
The filesystem hides the fragments from the block driver so that the file appears as a contiguous sequence of blocks to the loop device.
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TigerJr
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| Posted: Wed Dec 27, 2017 2:20 pm Post subject: |
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to NeddySeagoon
thanks for detailed answer, it makes good understanding of filesystem layers
| Quote: | | Consider that the file may be fragmented on the HDD. |
That filesystem lies on hardware raid layer, so im not consider that. It's raid problem)
In that topology i have botleneck in filesystem fileio those sync caches from loop driver in that large file....
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