Re: [zfs-discuss] ZVOL vs regular fs — huge difference in data consumption

Gordan Bobic gordan.bobic at gmail.com
Fri May 17 12:22:30 EDT 2013


iSCSI exports a block device with a sector size. Writes happen in sectors.
This sector size is the size of your block.


On Fri, May 17, 2013 at 5:05 PM, Daniel Smedegaard Buus <
danielbuus at gmail.com> wrote:

> On Fri, May 17, 2013 at 5:52 PM, Gordan Bobic <gordan.bobic at gmail.com>wrote:
>
>> It's more like one big partition than a file - there is no "file system"
>> on top of it. If you write data in blocks of 128KB, it'll store it in
>> blocks of 128KB. If you write data in blocks of 4KB, it'll store it in
>> blocks of 4KB.
>>
>>
> But how can it possibly know what block sizes are written? SCST wouldn't
> even know that, it "just" translates I/O operations, right? The only one
> who could possibly know the block size (assuming there isn't some "guest
> filesystem-sniffing" logic written into ZFS) would be Windows 7 on the
> remote computer... No?
>
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