[Gluster-users] File Size and Brick Size

[Krutika Dhananjay]

Hi,

What version of gluster are you using?
Also, could you share your volume configuration (`gluster volume info`)?

-Krutika

On Wed, Sep 28, 2016 at 6:58 AM, Ravishankar N <ravishankar at redhat.com>
wrote:

> On 09/28/2016 12:16 AM, ML Wong wrote:
>
> Hello Ravishankar,
> Thanks for introducing the sharding feature to me.
> It does seems to resolve the problem i was encountering earlier. But I
> have 1 question, do we expect the checksum of the file to be different if i
> copy from directory A to a shard-enabled volume?
>
>
> No the checksums must match. Perhaps Krutika who works on Sharding (CC'ed)
> can help you figure out why that isn't the case here.
> -Ravi
>
>
> [xxxxx at ip-172-31-1-72 ~]$ sudo sha1sum /var/tmp/oVirt-Live-4.0.4.iso
> ea8472f6408163fa9a315d878c651a519fc3f438  /var/tmp/oVirt-Live-4.0.4.iso
> [xxxxx at ip-172-31-1-72 ~]$ sudo rsync -avH /var/tmp/oVirt-Live-4.0.4.iso
> /mnt/
> sending incremental file list
> oVirt-Live-4.0.4.iso
>
> sent 1373802342 bytes  received 31 bytes  30871963.44 bytes/sec
> total size is 1373634560  speedup is 1.00
> [xxxxx at ip-172-31-1-72 ~]$ sudo sha1sum /mnt/oVirt-Live-4.0.4.iso
> 14e9064857b40face90c91750d79c4d8665b9cab  /mnt/oVirt-Live-4.0.4.iso
>
> On Mon, Sep 26, 2016 at 6:42 PM, Ravishankar N <ravishankar at redhat.com>
> wrote:
>
>> On 09/27/2016 05:15 AM, ML Wong wrote:
>>
>> Have anyone in the list who has tried copying file which is bigger than
>> the individual brick/replica size?
>> Test Scenario:
>> Distributed-Replicated volume, 2GB size, 2x2 = 4 bricks, 2 replicas
>> Each replica has 1GB
>>
>> When i tried to copy file this volume, by both fuse, or nfs mount. i get
>> I/O error.
>> Filesystem                  Size  Used Avail Use% Mounted on
>> /dev/mapper/vg0-brick1     1017M   33M  985M   4% /data/brick1
>> /dev/mapper/vg0-brick2     1017M  109M  909M  11% /data/brick2
>> lbre-cloud-dev1:/sharevol1  2.0G  141M  1.9G   7% /sharevol1
>>
>> [xxxxxx at cloud-dev1 ~]$ du -sh /var/tmp/ovirt-live-el7-3.6.2.iso
>> 1.3G /var/tmp/ovirt-live-el7-3.6.2.iso
>>
>> [melvinw at lbre-cloud-dev1 ~]$ sudo cp /var/tmp/ovirt-live-el7-3.6.2.iso
>> /sharevol1/
>> cp: error writing ‘/sharevol1/ovirt-live-el7-3.6.2.iso’: Input/output
>> error
>> cp: failed to extend ‘/sharevol1/ovirt-live-el7-3.6.2.iso’: Input/output
>> error
>> cp: failed to close ‘/sharevol1/ovirt-live-el7-3.6.2.iso’: Input/output
>> error
>>
>>
>> Does the mount log give you more information? It it was a disk full
>> issue, the error you would get is ENOSPC and not EIO. This looks like
>> something else.
>>
>>
>> I know, we have experts in this mailing list. And, i assume, this is a
>> common situation where many Gluster users may have encountered.  The worry
>> i have what if you have a big VM file sitting on top of Gluster volume ...?
>>
>> It is recommended to use sharding (http://blog.gluster.org/2015/
>> 12/introducing-shard-translator/) for VM workloads to alleviate these
>> kinds of issues.
>> -Ravi
>>
>> Any insights will be much appreciated.
>>
>>
>>
>> _______________________________________________
>> Gluster-users mailing listGluster-users at gluster.orghttp://www.gluster.org/mailman/listinfo/gluster-users
>>
>>
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