Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-27 Thread Roy Sigurd Karlsbakk
- "Tim.Kreis" 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 hardware. It s

Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-27 Thread Tim.Kreis
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 Hig

Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-26 Thread Brandon High
On Mon, Apr 26, 2010 at 8:51 AM, tim Kries 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 those checksum

Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-26 Thread tim Kries
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

Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-26 Thread tim Kries
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 ded

Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-26 Thread Constantin Gonzalez
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 rat

Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-23 Thread tim Kries
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. -- This message posted from opensolaris.org ___ zfs-discuss mailing

Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-23 Thread Khyron
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 the

Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-23 Thread tim Kries
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 -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensol

Re: [zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-23 Thread Richard Jahnel
You might note, dedupe only dedupes data that is writen after the flag is set. It does not retroactivly dedupe already writen data. -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensola

[zfs-discuss] ZFS deduplication ratio on Server 2008 backup VHD files

2010-04-23 Thread tim Kries
Hi, I am playing with opensolaris a while now. Today i tried to deduplicate the backup VHD files Windows Server 2008 generates. I made a backup before and after installing AD-role and copied the files to the share on opensolaris (build 134). First i got a straight 1.00x, then i set recordsize t