Thanks, John.
Regards, Richard Schuh > -----Original Message----- > From: The IBM z/VM Operating System > [mailto:[EMAIL PROTECTED] On Behalf Of John Franciscovich > Sent: Wednesday, April 09, 2008 8:45 AM > To: [email protected] > Subject: Re: Spool Question > > >Out of curiosity, how does CP allocate spool? I notice that our 14 > >regular spool volumes range from 43-91% used, according to Q ALLOC > >SPOOL. Does CP try to allocate new blocks on the least used > volume, or > >is allocation done using a rotating scheme? > > Allocation of new spool blocks is not based on the least used volume. > You could say it is done using a rotating scheme, but it is > certainly not a 1 for 1 rotation. > > The algorithm is not straightforward or trivial, and there > are several factors that determine which volume a spool block > is allocated on. > These range from the obvious, such as availability of space > on a particular volume, to less obvious and less predictable, > such as how many recent allocations (not a fixed number) have > been done on a volume. > The boundaries which trigger switching to a different volume > are not fixed, but are based on the size, type, and number of > volumes containing spool space. > > John Franciscovich > z/VM Development >
