Hi Pranith,
I presume you are asking for some version of the profile data that just
shows the dd test (or a repeat of the dd test). If yes, how do I
extract just that data?
Thanks
Pat
On 05/05/2017 10:58 AM, Pranith Kumar Karampuri wrote:
hi Pat,
Let us concentrate on the performance numbers part for now. We
will look at the permissions one after this?
As per the profile info, only 2.6% of the work-load is writes. There
are too many Lookups.
Would it be possible to get the data for just the dd test you were
doing earlier?
On Fri, May 5, 2017 at 8:14 PM, Pat Haley <pha...@mit.edu
<mailto:pha...@mit.edu>> wrote:
Hi Pranith & Ravi,
A couple of quick questions
We have profile turned on. Are there specific queries we should
make that would help debug our configuration? (The default
profile info was previously sent in
http://lists.gluster.org/pipermail/gluster-users/2017-May/030840.html
<http://lists.gluster.org/pipermail/gluster-users/2017-May/030840.html>
but I'm not sure if that is what you were looking for.)
We also started to do a test on serving gluster over NFS. We
rediscovered an issue we previously reported (
http://lists.gluster.org/pipermail/gluster-users/2016-September/028289.html
<http://lists.gluster.org/pipermail/gluster-users/2016-September/028289.html>
) in that the NFS mounted version was ignoring the group write
permissions. What specific information would be useful in
debugging this?
Thanks
Pat
On 04/14/2017 03:01 AM, Ravishankar N wrote:
On 04/14/2017 12:20 PM, Pranith Kumar Karampuri wrote:
On Sat, Apr 8, 2017 at 10:28 AM, Ravishankar N
<ravishan...@redhat.com <mailto:ravishan...@redhat.com>> wrote:
Hi Pat,
I'm assuming you are using gluster native (fuse mount). If
it helps, you could try mounting it via gluster NFS (gnfs)
and then see if there is an improvement in speed. Fuse
mounts are slower than gnfs mounts but you get the benefit
of avoiding a single point of failure. Unlike fuse mounts,
if the gluster node containing the gnfs server goes down,
all mounts done using that node will fail). For fuse mounts,
you could try tweaking the write-behind xlator settings to
see if it helps. See the performance.write-behind and
performance.write-behind-window-size options in `gluster
volume set help`. Of course, even for gnfs mounts, you can
achieve fail-over by using CTDB.
Ravi,
Do you have any data that suggests fuse mounts are slower
than gNFS servers?
I have heard anecdotal evidence time and again on the ML and IRC,
which is why I wanted to compare it with NFS numbers on his setup.
Pat,
I see that I am late to the thread, but do you happen to
have "profile info" of the workload?
You can follow
https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Monitoring%20Workload/
<https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Monitoring%20Workload/>
to get the information.
Yeah, Let's see if profile info shows up anything interesting.
-Ravi
Thanks,
Ravi
On 04/08/2017 12:07 AM, Pat Haley wrote:
Hi,
We noticed a dramatic slowness when writing to a gluster
disk when compared to writing to an NFS disk. Specifically
when using dd (data duplicator) to write a 4.3 GB file of
zeros:
* on NFS disk (/home): 9.5 Gb/s
* on gluster disk (/gdata): 508 Mb/s
The gluser disk is 2 bricks joined together, no replication
or anything else. The hardware is (literally) the same:
* one server with 70 hard disks and a hardware RAID card.
* 4 disks in a RAID-6 group (the NFS disk)
* 32 disks in a RAID-6 group (the max allowed by the
card, /mnt/brick1)
* 32 disks in another RAID-6 group (/mnt/brick2)
* 2 hot spare
Some additional information and more tests results (after
changing the log level):
glusterfs 3.7.11 built on Apr 27 2016 14:09:22
CentOS release 6.8 (Final)
RAID bus controller: LSI Logic / Symbios Logic MegaRAID
SAS-3 3108 [Invader] (rev 02)
*Create the file to /gdata (gluster)*
[root@mseas-data2 gdata]# dd if=/dev/zero of=/gdata/zero1
bs=1M count=1000
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 1.91876 s, *546 MB/s*
*Create the file to /home (ext4)*
[root@mseas-data2 gdata]# dd if=/dev/zero of=/home/zero1
bs=1M count=1000
1000+0 records in
1000+0 records out
1048576000 bytes (1.0 GB) copied, 0.686021 s, *1.5 GB/s -
*3 times as fast*
Copy from /gdata to /gdata (gluster to gluster)
*[root@mseas-data2 gdata]# dd if=/gdata/zero1 of=/gdata/zero2
2048000+0 records in
2048000+0 records out
1048576000 bytes (1.0 GB) copied, 101.052 s, *10.4 MB/s* -
realllyyy slooowww
*Copy from /gdata to /gdata* *2nd time *(gluster to gluster)**
[root@mseas-data2 gdata]# dd if=/gdata/zero1 of=/gdata/zero2
2048000+0 records in
2048000+0 records out
1048576000 bytes (1.0 GB) copied, 92.4904 s, *11.3 MB/s* -
realllyyy slooowww again
*Copy from /home to /home (ext4 to ext4)*
[root@mseas-data2 gdata]# dd if=/home/zero1 of=/home/zero2
2048000+0 records in
2048000+0 records out
1048576000 bytes (1.0 GB) copied, 3.53263 s, *297 MB/s *30
times as fast
*Copy from /home to /home (ext4 to ext4)*
[root@mseas-data2 gdata]# dd if=/home/zero1 of=/home/zero3
2048000+0 records in
2048000+0 records out
1048576000 bytes (1.0 GB) copied, 4.1737 s, *251 MB/s* - 30
times as fast
As a test, can we copy data directly to the xfs mountpoint
(/mnt/brick1) and bypass gluster?
Any help you could give us would be appreciated.
Thanks
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Pat Haley Email:pha...@mit.edu
<mailto:pha...@mit.edu>
Center for Ocean Engineering Phone: (617) 253-6824
Dept. of Mechanical Engineering Fax: (617) 253-8125
MIT, Room 5-213http://web.mit.edu/phaley/www/
77 Massachusetts Avenue
Cambridge, MA 02139-4301
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_______________________________________________
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--
Pranith
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Pat Haley Email:pha...@mit.edu
<mailto:pha...@mit.edu>
Center for Ocean Engineering Phone: (617) 253-6824
Dept. of Mechanical Engineering Fax: (617) 253-8125
MIT, Room 5-213http://web.mit.edu/phaley/www/
77 Massachusetts Avenue
Cambridge, MA 02139-4301
--
Pranith
--
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Pat Haley Email: pha...@mit.edu
Center for Ocean Engineering Phone: (617) 253-6824
Dept. of Mechanical Engineering Fax: (617) 253-8125
MIT, Room 5-213 http://web.mit.edu/phaley/www/
77 Massachusetts Avenue
Cambridge, MA 02139-4301
_______________________________________________
Gluster-users mailing list
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http://lists.gluster.org/mailman/listinfo/gluster-users
