I want to tune samba on a system that has LVM2 under it. I have started to read an article which made me to ask this question, if my partition supports unwritten extents or not, I couldn't find it by googling it.

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    What matters is the file system you put on top of that LV. LVM or partitions or full disks just give you a block device, unwritten extents are irrelevant to them. – Stéphane Chazelas Feb 23 '15 at 12:47

As Stéphane Chazelas said, LVM is irrelevant.

You can see what type of partition table you use for example by mount.

I have ext4 on top of my LVM, but adding to my samba config the strict allocate = Yes did stop my samba working, being accessible.

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