MDRAID & O_DIRECT

I moved this away from Proxmox 4.4 virtio_scsi regression to avoid necroposting, this is a reply to post from @t.lamprecht originally.

NB I do not solicit any reaction, I just wanted to let anyone, who wants to correct me, give that opportunity. But the below is my understanding.

t.lamprecht said:

Yeah, and as Wolfgang wrote one can trigger a modification of the butter after write was issued,

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The way I understood this whole historical situation:
1. there was unexplained corruption...

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