The problem is that the windows server backup seems to choose dynamic
vhd (which would make sense in most cases) and I dont know if there is a
way to change that. Using ISCSI-volumes wont help in my case since
servers are running on physical hardware.
Am 27.04.2010 01:54, schrieb Brandon
- Tim.Kreis tim.kr...@gmx.de skrev:
The problem is that the windows server backup seems to choose dynamic
vhd (which would make sense in most cases) and I dont know if there is
a
way to change that. Using ISCSI-volumes wont help in my case since
servers are running on physical
Hi Tim,
thanks for sharing your dedup experience. Especially for Virtualization, having
a good pool of experience will help a lot of people.
So you see a dedup ratio of 1.29 for two installations of Windows Server 2008 on
the same ZFS backing store, if I understand you correctly.
What dedup
Hi,
The setting was this:
Fresh installation of 2008 R2 - server backup with the backup feature - move
vhd to zfs - install active directory role - backup again - move vhd to same
share
I am kinda confused over the change of dedup ratio from changing the record
size, since it should dedup
I found the VHD specification here:
http://download.microsoft.com/download/f/f/e/ffef50a5-07dd-4cf8-aaa3-442c0673a029/Virtual%20Hard%20Disk%20Format%20Spec_10_18_06.doc
I am not sure if i understand it right, but it seems like data on disk gets
compressed into the vhd (no empty space), so even
On Mon, Apr 26, 2010 at 8:51 AM, tim Kries tim.kr...@gmx.de wrote:
I am kinda confused over the change of dedup ratio from changing the record
size, since it should dedup 256-bit blocks.
Dedup works on the blocks or either recordsize or volblocksize. The
checksum is made per block written, and
You might note, dedupe only dedupes data that is writen after the flag is set.
It does not retroactivly dedupe already writen data.
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It was active all the time.
Made a new zfs with -o dedup=on, copied with default record size, got no dedup,
deleted files, set recordsize 4k, dedup ratio 1.29x
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A few things come to mind...
1. A lot better than...what? Setting the recordsize to 4K got you some
deduplication but maybe the pertinent question is what were you
expecting?
2. Dedup is fairly new. I haven't seen any reports of experiments like
yours so...CONGRATULATIONS!! You're probably
Dedup is a key element for my purpose, because i am planning a central
repository for like 150 Windows Server 2008 (R2) servers which would take a lot
less storage if they dedup right.
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