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Re: [Qemu-devel] [PATCH v3 0/8] block: drive-backup live backup command
From: |
Benoît Canet |
Subject: |
Re: [Qemu-devel] [PATCH v3 0/8] block: drive-backup live backup command |
Date: |
Mon, 2 Sep 2013 14:57:23 +0200 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
I don't see the point of using hashes.
Using hashes means that at least one extra read will be done on the target to
compute the candidate target hash.
It's bad for a cloud provider where IOs count is a huge cost.
Another structure to replace a bitmap (smaller on the canonical case) would be
a block table as described in the Hystor paper:
www.cse.ohio-state.edu/~fchen/paper/papers/ics11.pdf
Best regards
Benoît
- Re: [Qemu-devel] [PATCH v3 0/8] block: drive-backup live backup command,
Benoît Canet <=