Understanding Ceph

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Hi All

I am trying to get my feet wet with Ceph and RADOS. My aim is to use
it as a block device for KVM instances. My understanding is that
virtual disks get striped at 1 MB boundaries by default. Does that
mean that there are going to be 1MB files on disks? Let's say I want
to update a particular vdisk with 16 bytes of data at offset 4096.
This would mean I want to update the first 1MB chunk. Let us assume I
have 3 way replication and the replicas are A, B and C. The write may
succeed at A and B and fail at C. Is there any state kept in the
metadata indicating at which replicas the write succeeded?
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