presto man page on OpenBSD

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PRESTO(4)	      OpenBSD Programmer's Manual (SPARC)	     PRESTO(4)

     presto - Prestoserve battery-backed memory

     presto* at sbus?

     The Legato Prestoserve NVRAM cards used to be part of the ``NFS
     accelerator'' product, which used the cards memory as an NFS-dedicated
     cache, increasing performance of NFS servers exporting filesystem as NFS
     protocol, version 2.

     The presto driver does not attempt to achieve such a behaviour, which is
     questionable with the advent of NFS protocol, version 3.

     Instead, it will provide direct access to the NVRAM, as a block device.

     /dev/prestoup	block mode Prestoserve card number u, partition p
     /dev/rprestoup	raw mode Prestoserve card number u, partition p

     intro(4), disklabel(5), disklabel(8), MAKEDEV(8)

     The NVSIMM flavour, designed for SPARCstation models 10 and 20, is not
     supported yet.

OpenBSD 4.9			 July 11, 2010			   OpenBSD 4.9

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