Matthew Stevenson wrote:
It does lead to another question though: is there a way to see how much data is
shared between any two given snapshots
only if these are the only two snapshots (and no clones) as then the
difference in a total used space for all snapshots (two of them) and a
sum of
On Thu, Aug 20, 2009 at 5:25 PM, Robert Milkowski mi...@task.gda.pl wrote:
Matthew Stevenson wrote:
Ha ha, I know! Like I say, I do get COW principles!
I guess what I'm after is for someone to look at my specific example (in txt
file attached to first post) and tell me specifically how to
Thank you very much, this explains it perfectly.
I had been coming to the conclusion that the shared data must be what accounts
for the missing space, but previously my thinking/expectation was that it
would be charged against the snapshot in which the shared data first
appeared. Doing that
Matthew Stevenson wrote:
Ha ha, I know! Like I say, I do get COW principles!
I guess what I'm after is for someone to look at my specific example (in txt
file attached to first post) and tell me specifically how to find out where the
13.8GB number is coming from.
I feel like a total numpty
The guide is good, but didn't tell me anything I didn't already know about this
area unfortunately.
Anyway, I freed up a big chunk of space by first deleting the snapshot which
was reported by zfs list as being the largest (2GB). Doing zfs list after this
deletion revealed that several of the
On Tue, Aug 18, 2009 at 2:37 PM, Matthew
Stevensonno-re...@opensolaris.org wrote:
So there must be basically lots of references to data that hide themselves
from the surface and can't really be found using zfs list.
zfs list -t all usually works for me. Look at USED and REFER
My understanding
Hi, thanks for the info.
Can you have a look at the attachment on the original post for me?
Everything you said is what I expected to see in the output there, but a lot of
the values are blank where I hoped they would at least be able to tell me a
breakdown of the USEDSNAP figure
As far as I
On Tue, Aug 18, 2009 at 4:09 PM, Matthew
Stevensonno-re...@opensolaris.org wrote:
Hi, thanks for the info.
Can you have a look at the attachment on the original post for me?
Everything you said is what I expected to see in the output there, but a lot
of the values are blank where I hoped
Well, I see USEDSNAP 13.8 GB for the dataset, so if you delete ALL
snapshots you'd probably be able to get that much.
I agree, it's just hard to see how...
As for which snapshot to delete to get most space,
that's a liitle
bit tricky. See
it's pretty simple, if i understand it correctly. When you add some blocks
to zfs...
xxx
then take a snapshot
(snapshot of x)
the disk has the space of the x's and the snapshot does't take up any space
yet
then you add more to the drive
and maybe take another snapshot
I do understand these concepts, but to me that still doesn't explain why adding
the size of each snapshot together doesn't equal the size reported by zfs list
in USEDSNAP.
I'm clearly missing something. Hmmm...
--
This message posted from opensolaris.org
On Aug 18, 2009, at 9:04 AM, Matthew Stevenson wrote:
I do understand these concepts, but to me that still doesn't explain
why adding the size of each snapshot together doesn't equal the size
reported by zfs list in USEDSNAP.
Here is the pertinent text from the ZFS Admin Guide.
dude, i just explained it =)
ok...let me see if i can do better...
if you have a file that's 1 gb , in zfs you have those blocks added. on a
normal filesystem when you edit the file or add to it, it will erase the old
file and add a new one over it (more or less).
on zfs, you have the blocks
Ha ha, I know! Like I say, I do get COW principles!
I guess what I'm after is for someone to look at my specific example (in txt
file attached to first post) and tell me specifically how to find out where the
13.8GB number is coming from.
I feel like a total numpty for going on about this, I
If you understand how copy on write works and how snapshots work then the
concept of the extra space should make perfect since. If you want a
mathmatic formula for how to figure it out i would have to say that it would
be based on how DIFFERENT the data is between snapshots AND how MUCH data it
Please can someone take a look at the attached file which shows the output on
my machine of
zfs list -r -t filesystem,snapshot -o space rpool/export/home/matt
The USEDDS figure of ~2GB is what I would expect, and is the same figure
reported by the Disk Usage Analyzer. Where is the remaining
On Aug 14, 2009, at 9:19 AM, Matthew Stevenson wrote:
Please can someone take a look at the attached file which shows the
output on my machine of
zfs list -r -t filesystem,snapshot -o space rpool/export/home/matt
The USEDDS figure of ~2GB is what I would expect, and is the same
figure
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