ISCSI server on MFSMount about moosefs HOT 10 CLOSED

Hi,
Basically we had small bug in our MooseFS client code. Right now you can download corrected source code (fixed by ef431a5).
Packages will be available this week.

The other question is - which iSCSI software should be used?
We tried couple of them, and SCST was most suitable for MooseFS.

Please consider to update you operating system because linux kernel and fuse library are quite old.

from moosefs.

Thank you.

from moosefs.

Sorry, I view the code. I can't understand what bug is fixed by this code. Anywhere the inode would by modify?
And this problem also occured when I read files from this disk for a long time on the client. And I open this file and seek it as follow is also block.

[root@YU-73 mfs]# python 
Python 2.6.6 (r266:84292, Aug 18 2016, 15:13:37) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-17)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> f = open("iscsi-disk", "r+") # iscsi-disk is block device
>>> f.seek(0)

I use mfsnetdump catch network package. I find seek opration is not send package to master.

from moosefs.

Hi,

Problem was connected with our new data structure that we have used in this version.
Please update the MooseFS client and do some tests.

I'm looking forward to hearing from you.

from moosefs.

OK,
I will update fuse version to 2.9.3! Should I update my kernel version or change my iSCSI to SCST?

from moosefs.

Hi,

According to iSCSI target software.
With SCST and MooseFS we achieved the best performance and stability. Basically only SCST was able to use block size larger than 4k.

About kernel. In my humble opinion newer and stable kernel is always good option.
Please consider to use relatively new Linux distributions like CentOS 7 or Ubuntu 16 in your cluster.

from moosefs.

Thank you.

from moosefs.

Hi @xandrus ,
When I install SCST, I have some problem.
When I install SCST without patching my kernel, The same problem would occured.
In the SCST source code, I can't find "scst_exec_req_fifo-2.6.32.patch" to patch my kernel.(PS. I can find "put_page_callback-2.6.32.patch"). I also try to run the "rebuild-rhel-kernel-rpm", but useless.
I will change My Linux distributions to CentOS 7. Can you give me some suggestion to install SCST on CentOS 7? Can I install SCST without patching kernel?

from moosefs.

Please search for something like SCST DKMS.
This solution will allow you to build only modules for kernel not whole kernel.

from moosefs.

Thank you for much!

from moosefs.