[Gluster-users] Disk use with GlusterFS

Fri Mar 6 03:49:59 UTC 2020

@Amar/Mohit, Do you see any issues with Posix reserve feature?

> On 06-Mar-2020, at 9:11 AM, David Cunningham <dcunningham at voisonics.com> wrote:
> 
> Hi Aravinda,
> 
> That's what was reporting 54% used, at the same time that GlusterFS was giving no space left on device errors. It's a bit worrying that they're not reporting the same thing.
> 
> Thank you.
> 
> 
> On Fri, 6 Mar 2020 at 16:33, Aravinda VK <aravinda at kadalu.io <mailto:aravinda at kadalu.io>> wrote:
> Hi David,
> 
> What is it reporting for brick’s `df` output?
> 
> ```
> df /nodirectwritedata/gluster/gvol0
> ```
> 
> —
> regards
> Aravinda Vishwanathapura
> https://kadalu.io <https://kadalu.io/>
> 
>> On 06-Mar-2020, at 2:52 AM, David Cunningham <dcunningham at voisonics.com <mailto:dcunningham at voisonics.com>> wrote:
>> 
>> Hello,
>> 
>> A major concern we have is that "df" was reporting only 54% used and yet GlusterFS was giving "No space left on device" errors. We rely on "df" to report the correct result to monitor the system and ensure stability. Does anyone know what might have been going on here?
>> 
>> Thanks in advance.
>> 
>> 
>> On Thu, 5 Mar 2020 at 21:35, David Cunningham <dcunningham at voisonics.com <mailto:dcunningham at voisonics.com>> wrote:
>> Hi Aravinda,
>> 
>> Thanks for the reply. This test server is indeed the master server for geo-replication to a slave.
>> 
>> I'm really surprised that geo-replication simply keeps writing logs until all space is consumed, without cleaning them up itself. I didn't see any warning about it in the geo-replication install documentation which is unfortunate. We'll come up with a solution to delete log files older than the LAST_SYNCED time in the geo-replication status. Is anyone aware of any other potential gotchas like this?
>> 
>> Does anyone have an idea why in my previous note some space in the 2GB GlusterFS partition apparently went missing? We had 0.47GB of data, 1GB reported used by .glusterfs, which even if they were separate files would only add up to 1.47GB used, meaning 0.53GB should have been left in the partition. If less space is actually being used because of the hard links then it's even harder to understand where the other 1.53GB went. So why would GlusterFS report "No space left on device"?
>> 
>> Thanks again for any assistance.
>> 
>> 
>> On Thu, 5 Mar 2020 at 17:31, Aravinda VK <aravinda at kadalu.io <mailto:aravinda at kadalu.io>> wrote:
>> Hi David,
>> 
>> Is this Volume is uses Geo-replication? Geo-replication feature enables Changelog to identify the latest changes happening in the GlusterFS volume. 
>> 
>> Content of .glusterfs directory also includes hardlinks to the actual data, so the size shown in .glusterfs is including data. Please refer the comment by Xavi https://github.com/gluster/glusterfs/issues/833#issuecomment-594436009 <https://github.com/gluster/glusterfs/issues/833#issuecomment-594436009>
>> 
>> If Changelogs files are causing issue, you can use archival tool to remove processed changelogs.
>> https://github.com/aravindavk/archive_gluster_changelogs <https://github.com/aravindavk/archive_gluster_changelogs>
>> 
>> —
>> regards
>> Aravinda Vishwanathapura
>> https://kadalu.io <https://kadalu.io/>
>> 
>> 
>>> On 05-Mar-2020, at 9:02 AM, David Cunningham <dcunningham at voisonics.com <mailto:dcunningham at voisonics.com>> wrote:
>>> 
>>> Hello,
>>> 
>>> We are looking for some advice on disk use. This is on a single node GlusterFS test server.
>>> 
>>> There's a 2GB partition for GlusterFS. Of that, 470MB is used for actual data, and 1GB is used by the .glusterfs directory. The .glusterfs directory is mostly used by the two-character directories and the "changelogs" directory. Why is so much used by .glusterfs, and can we reduce that overhead?
>>> 
>>> We also have a problem with this test system where GlusterFS is giving "No space left on device" errors. That's despite "df" reporting only 54% used, and even if we add the 470MB to 1GB used above, that still comes out to less than the 2GB available, so there should be some spare.
>>> 
>>> Would anyone be able to advise on these please? Thank you in advance.
>>> 
>>> The GlusterFS version is 5.11 and here is the volume information:
>>> 
>>> Volume Name: gvol0
>>> Type: Distribute
>>> Volume ID: 33ed309b-0e63-4f9a-8132-ab1b0fdcbc36
>>> Status: Started
>>> Snapshot Count: 0
>>> Number of Bricks: 1
>>> Transport-type: tcp
>>> Bricks:
>>> Brick1: myhost:/nodirectwritedata/gluster/gvol0
>>> Options Reconfigured:
>>> transport.address-family: inet
>>> nfs.disable: on
>>> geo-replication.indexing: on
>>> geo-replication.ignore-pid-check: on
>>> changelog.changelog: on
>>> 
>>> -- 
>>> David Cunningham, Voisonics Limited
>>> http://voisonics.com/ <http://voisonics.com/>
>>> USA: +1 213 221 1092
>>> New Zealand: +64 (0)28 2558 3782
>>> ________
>>> 
>>> 
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>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> -- 
>> David Cunningham, Voisonics Limited
>> http://voisonics.com/ <http://voisonics.com/>
>> USA: +1 213 221 1092
>> New Zealand: +64 (0)28 2558 3782
>> 
>> 
>> -- 
>> David Cunningham, Voisonics Limited
>> http://voisonics.com/ <http://voisonics.com/>
>> USA: +1 213 221 1092
>> New Zealand: +64 (0)28 2558 3782
> 
> 
> 
> 
> 
> 
> 
> -- 
> David Cunningham, Voisonics Limited
> http://voisonics.com/ <http://voisonics.com/>
> USA: +1 213 221 1092
> New Zealand: +64 (0)28 2558 3782

Aravinda Vishwanathapura
https://kadalu.io

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