Please explain Persistant Reservation (SCSI)

[TheMouse]

Can someone please explain to me what persistant reservation is and what it can be used for? All my desktops currently run off iSCSI targets in a SAN and have no hard drives in them. TIA.

 

[yinan]

Damn this seems like overkill, but from what I recall persistent reservations are most often used with clusters.

 

[TheMouse]

Yea... I just want to get an idea of what it is.

 

[Emulex]

try googling scsi-3 or wiki.

 

[TheMouse]

try googling scsi-3 or wiki.

The jargon is over my head. I am not in infrastructure. I was looking for a simple explaination.

 

[Emulex]

http://www.servercare.nl/Lists/Posts/Post.aspx?ID=71

really simple. just don't use lame iscsi servers that do not implements reservations. matter of fact make sure you pick one that can handle boatloads of locks and reservations. i've seen vmware take down some pretty big san's with iscsi due to overloading and thin provisioning of lun's (bad practice).

scsi-3 has been around for ages; only poor products would support scsi-2 (thus lack of reservations)

 

[SammyJr]

scsi-3 has been around for ages; ... In other words, most Linux iSCSI targets. :(

 

[Emulex]

try lefthand VSA trial or (windows) starwind trial. both let you get an idea.

iscsi is somewhat overrated imo.