Facing problem when attempting to recover the file in the tgt shared directory without the remount operation

Facing problem when attempting to recover the file in the tgt shared directory without the remount operation

[zhao.mingyue]

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Hi
  I have met a problem currently when attempting to recovery the file in the tgt shared directory without the remount operation。

Here is the detailed steps:
1、 using XFS to create two files: file1 & file2 in the mounted directory(for example /home/aaa/)
2、 create a snap of the rbd named as snap1
3、 delete file1 & file2 in /home/aaa/
4、 rollback of rbd by snap1
5、 input “ls” in /home/aaa/
6、 no results shown
7、 if I remount the shared disks to /home/aaa/, file1 & file2 will be shown in the /home/aaa/,

My question:
Are there any methods to show the updated file information in the shared directory without using the remount operation, thanks!

The iscsi-target protocol diagram:
                                  CLIENT                                                                                         server
|----------------------------------------------------------------------|                                |-----------------------------------------------|
|         /home/aaa/                                                               |                                |                                                               |
|             XFS--------------   iSCSI-Initiator -------------------- |------------------------|--------ISCSI-target---------------rbd      |
|________________________________________|                                |___________________________|



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Re: Facing problem when attempting to recover the file in the tgt shared directory without the remount operation

[Emmanuel Florac]

Le Sun, 6 Dec 2015 06:08:44 +0000
"zhao.mingyue@h3c.com" <zhao.mingyue@h3c.com> écrivait:

> My question:
> Are there any methods to show the updated file information in the
> shared directory without using the remount operation, thanks!

Using XFS, probably not. Maybe using some form of cluster filesystem
(like GFS2, OCFS2, etc) and some SCSI magic but I doubt it. I'm pretty
sure you must use CEPH as a filesystem for these sort of things to
work as you intend. 

-- 
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Emmanuel Florac     |   Direction technique
                    |   Intellique
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