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About LUNs
Hello, I am investigating about gain performance on my RN214, I was reading LUNs on Readsy OS user manual, Actually I do not have enough information about what is LUN and what for... is it using fo...
Leventh wrote:The LUN makes the virtual disk residing on a storage system, the network protocol to make the disk available to one (or multiple system with cluster capabilities on capable NAS system) is iSCSI. So the storage is remote (on a NAS) while the server or any other computer does handle the file system on this LUN locally. The system does not have to be server (the primary usage is in the server business no doubts), it can be any kind of a workstation, a RasPi, ...
Leventh wrote:Depending on the LUN host/iSCSI server (NAS) technology used, a LUN is hosted on a kind of a partition. Technically this can be file-based LUNs implemented simply a huge file or more flexible as a sparse bundle (not the allocating the full space), block-based LUNs which can reside on a Storage Pool which is again composed of one or multiple RAIDs, even backed by multi-level tiering. Some hard core OS file systems combine and use different technology layers, like simple JBOD, building redundancy, and the like.
Regardless, one LUN can be accessed by one host, or for the sake by one cluster file system capable systems. the file system level is done on the system(s), not on the NAS. As most usual client or computer OS variants are not cluster capable, this does limit the access to the LUN to one single system. of course, you could re-share the new iSCSI based volume and file system. but for this one does commonly operate dedicated networks with dedicated interface(s) - one for storage, one for the service protocol like SMB again.
A small ReadyNAS and e.g. a Windows system (Pro, Enterprise probably) allow some experimenting if you desire. Under the line, I'm afraid it won't do what you expect from it.
Dear
Leventh wrote:
The LUN makes the virtual disk residing on a storage system, the network protocol to make the disk available to one (or multiple system with cluster capabilities on capable NAS system) is iSCSI. So the storage is remote (on a NAS) while the server or any other computer does handle the file system on this LUN locally. The system does not have to be server (the primary usage is in the server business no doubts), it can be any kind of a workstation, a RasPi, ...
Leventh wrote:
Depending on the LUN host/iSCSI server (NAS) technology used, a LUN is hosted on a kind of a partition. Technically this can be file-based LUNs implemented simply a huge file or more flexible as a sparse bundle (not the allocating the full space), block-based LUNs which can reside on a Storage Pool which is again composed of one or multiple RAIDs, even backed by multi-level tiering. Some hard core OS file systems combine and use different technology layers, like simple JBOD, building redundancy, and the like.
Regardless, one LUN can be accessed by one host, or for the sake by one cluster file system capable systems. the file system level is done on the system(s), not on the NAS. As most usual client or computer OS variants are not cluster capable, this does limit the access to the LUN to one single system. of course, you could re-share the new iSCSI based volume and file system. but for this one does commonly operate dedicated networks with dedicated interface(s) - one for storage, one for the service protocol like SMB again.
A small ReadyNAS and e.g. a Windows system (Pro, Enterprise probably) allow some experimenting if you desire. Under the line, I'm afraid it won't do what you expect from it.
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