On Mon, May 9, 2011 at 2:11 AM, Evaldas Auryla <[email protected]>wrote:
> On 05/ 6/11 07:21 PM, Brandon High wrote: > >> On Fri, May 6, 2011 at 9:15 AM, Ray Van Dolson<[email protected]> >> wrote: >> >> We use dedupe on our VMware datastores and typically see 50% savings, >>> often times more. We do of course keep "like" VM's on the same volume >>> >> I think NetApp uses 4k blocks by default, so the block size and >> alignment should match up for most filesystems and yield better >> savings. >> > Assuming that VMware datastores are on NFS ? Otherwise VMware filesystem > VMFS uses its own block sizes from 1M to 8M, so the important point is to > align guest OS partition to 1M, and Windows guests starting from Vista/2008 > do that by default now. > > Regards, > > The VMFS filesystem itself is aligned by NetApp at LUN creation time. You still align to a 4K block on a filer because there is no way to automatically align an encapsulated guest, especially when you could have different guest OS types on a LUN. --Tim
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