On 04/01/2015 10:57 AM, Ranjan Maitra wrote:
Thanks!
That's EMC's "OneFS" filesystem (EMC bought out Isilon).
On Wed, 1 Apr 2015 08:07:34 -0500 Ranjan Maitra <maitra.mbox.ignored@xxxxxxxxx> wrote:
Thanks to both Cameron and you, Bob!
After the transfer, here is what we have, on that filesystem:
$ du -sh kmeans --apparent-size
154G kmeans
$ du -sh kmeans
628G kmeans
So, I guess that leaves me (and others) stuck.
Is "kmeans" on the target or the source filesystem?
Sorry, this is on the target (Isilon FS). Locally (on a F21 workstation and ext4 FS) it clocks in at 154G and 159G respectively.
If it's the source,
keep in mind that OneFS can do data dedupes (assuming it's enabled),
but it is a NAS device (NFS and/or SMB). I don't believe it's capable
of sparse files (few NAS are). The data dedupe would reduce the actual
storage on disk on the EMC device , but not report it as a sparse
filesystem
Yes, I have been given this explanation, as well as that th block size is turned up on the isilon. This means that the size of a single file is probably 16K, rather than the typical 4K desktop file size. However, I do not have files that are that small where it would make a difference. So, I don't know.
I see: the dedupe is supposed to run over weekends but I am not sure what it does.
Deduping is a process by which redundant data on a storage device is
removed. You can loosely think of it as "gzip" at the block level on
the storage device itself (although gzip is _compression_, not
deduping). Everything on the device will _appear_ normal, but the
redundancies will have been removed and less physical space used.
Here's a good explanation:
http://www.webopedia.com/TERM/D/data_deduplication.html
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