On 12/08/2015 08:28 PM, Ankireddypalle Reddy wrote:
Vijay,
We are trying to write data backed up by Commvault simpana to glusterfs volume. The data being written is around 30 GB. Two kinds of write requests happen.
1) 1MB requests
2) Small write requests of size 128 bytes. In case of libgfapi access these are cached and a single 128KB write request is made where as in case of FUSE the 128 byte write request is handled to FUSE directly.
glusterfs 3.6.5 built on Aug 24 2015 10:02:43
Volume Name: dispersevol
Type: Disperse
Volume ID: c5d6ccf8-6fec-4912-ab2e-6a7701e4c4c0
Status: Started
Number of Bricks: 1 x (2 + 1) = 3
Transport-type: tcp
Bricks:
Brick1: ssdtest:/mnt/ssdfs1/brick3
Brick2: sanserver2:/data/brick3
Brick3: santest2:/home/brick3
Options Reconfigured:
performance.cache-size: 512MB
performance.write-behind-window-size: 8MB
performance.io-thread-count: 32
performance.flush-behind: on
hi,
Things look okay. May be we can find something using profile info.
Could you post the results of the following operations:
1) gluster volume profile <volname> start
2) Run the fuse workload
3) gluster volume profile <volname> info > /path/to/file-1/to/send/us
4) Run the libgfapi workload
5)gluster volume profile <volname> info > /path/to/file-2/to/send/us
Send both these files to us to check what are the extra fops if any that
are sent over network which may be causing the delay.
I see that you are using disperse volume. If you are going to use
disperse volume for production usecases, I suggest you use 3.7.x
preferably 3.7.3. We fixed a bug in releases from 3.7.4 till 3.7.6 which
will be released in 3.7.7.
Pranith
Thanks and Regards,
Ram
-----Original Message-----
From: Vijay Bellur [mailto:vbellur@xxxxxxxxxx]
Sent: Monday, December 07, 2015 6:13 PM
To: Ankireddypalle Reddy; gluster-users@xxxxxxxxxxx
Subject: Re: libgfapi access
On 12/07/2015 10:29 AM, Ankireddypalle Reddy wrote:
Hi,
I am trying to use libgfapi interface to access gluster
volume. What I noticed is that reads/writes to the gluster volume
through libgfapi interface are slower than FUSE. I was expecting the
contrary. Are there any recommendations/settings suggested to be used
while using libgfapi interface.
Can you please provide more details about your tests? Providing information like I/O block size, file size, throughput would be helpful.
Thanks,
Vijay
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