LARGE single-system Cyrus installs?

Rob Mueller robm at
Fri Nov 16 01:39:47 EST 2007

>> About 30% of all I/O is to mailboxes.db, most of which is read.  I

> Solaris 10 does this in my case. Via dtrace you'll see that open() on the 
> mailboxes.db and read-calls do not exceed microsecond ranges. mailboxes.db 
> is not the problem here. It is entirely cached and rarely written 
> (creating, deleting and moving a mailbox).

So what does "30% of all I/O" mean in that original statement? Does that 
mean "30% of all IO requests from application to OS" or does that mean "30% 
of all IO requests from OS to IO device"? I assumed you meant the second 
because usually accessing data cached in memory isn't actually considered IO 
by most people...


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