[ale] Sportin' SCSI/RAID

[eric.ayers at mindspring.com (Eric Z. Ayers)]

Hello Jeff,

Most UNIX clustering solutions don't allow both machines to mount the
same SCSI target,LUN at the same time.  In fact, the SCSI protocol has 
this concept called a reservation which explicitly prohibits two host
adapters from talking to the same device simultaneously.

-Eric.

Jeff Hubbs writes:
 > Does anyone here have any experience with sharing a RAID array between two
 > Linux systems over a common SCSI bus?  What is required?  What are the
 > gotchas?  Is it less of a problem if one of the two machines only reads from
 > the RAID volume?  
 > 
 > If the shared RAID array in question held, say, a MySQL database, how would
 > both machines access it (again, presuming one machine only reads)?  An
 > instance of MySQL on each system?
 > 
 > - Jeff
 > 
 > ** Happy Holidays to the ALE! **
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