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
> <mailto: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/
> <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 list
>> Gluster-users at gluster.org <mailto:Gluster-users at
gluster.org>
>> http://www.gluster.org/mailman/listinfo/gluster-users
>> <http://www.gluster.org/mailman/listinfo/gluster-users>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
<http://www.gluster.org/pipermail/gluster-users/attachments/20160928/a97fb575/attachment.html>