ZFS ZFS iscsi (nfs is very slow)

A

aabaab

nfs is very slow for my clients, I have 10G connectivity between server and clients.
I want to get a zvol created on zfs and want to get two initiators connected to this zvol via iscsi. I tried that and on one of the initiators I used fdisk to create the ext4 filesystem over it and mounted it, the other initiator after login to target mounted the same volume, but I can't have the files synchronized on it i.e. when one initiator creates the file on the volume the other can't see it unless it umount and mount that again. How can I have the same volume mounted on both the targets and can have the synchronized data over it ? Is it even possible ?

Thanks in advance for the help.
 
correct, it is not possible. this would be like having the same hard drive plugged into two computers, they will fight over allocated space and overwrite each others' content. sorry.
 
You could write a special filesystem for that case...

Would be based on the NFS code.

Overall it might be better to debug the NFS performance problem.
 
cracauer@ said:
You could write a special filesystem for that case...
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Typically, these things are called cluster file systems, or shared disk file systems. They are not uncommon. But they tend to be complex, and optimized for large installations. Oracle has open-sourced the Oracle Cluster File System OCFS2, but I don't know whether it is being actively maintained. RedHat used to have GFS (the global file system, not to be confused with GFS = Google file system which is not open source). In the BSD area, Matt Dillon's Hammer2 does clustering (although I don't know whether it was ever coded to completion). To be honest, I think none of the open-source options are functional. A better solution might theoretically be to go directly to a cluster file system, where access to the raw block device is performed by a cluster host; I think both Ceph and Lustre are freely downloadable, but getting them set up would be a major task.

Would be based on the NFS code.
Click to expand...
That sort of describes Panasas' PanFS, which is to a large extent built around NFS. Although the flow here goes the other way: A lot of NFSv4 was built by starting from PanFS. To set a scale: At its peak, Panasas had about 60-80 engineers working on building this system. Not something an amateur can knock out over a weekend.
 
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