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- From: wrwalke@ddn-wms.nmi.com (William Walker)
- Newsgroups: comp.sys.sun.admin
- Subject: Re: what is prestoserve??
- Summary: prestoserve on alternate bus...
- Message-ID: <98@ddn-wms.nmi.com>
- Date: 17 Nov 92 20:23:23 GMT
- References: <1992Oct30.171756.9140@walter.cray.com> <1992Nov1.003446.835@ukw.uucp> <1992Nov02.093827.6272@einoed.in-berlin.de>
- Organization: Network Mgmt Inc., Fairfax, VA
- Lines: 35
-
- In article <1992Nov02.093827.6272@einoed.in-berlin.de>, alh@einoed.in-berlin.de (Adrian Le Hanne) writes:
- > lupe@ukw.uucp (Lupe Christoph) writes:
- >
- > >PrestoServe is something like a write buffer for NFS. Writes are saved
- > >into static, battery buffered RAM to be written to disk "at leasure".
- > >Pros: helps a lot if you have lots of NFS writes.
- > >Cons: does not help much if you don't. ;-)
- >
- > [...]
- > There is (at least =) a minor problem with the PrestoServe accelerators,
- > you can only accelerate those disk drives that are on the same bus as the
- > PrestoServe accelerator, i.e. you need the VME board. We tried to accelerate
- > additional SCSI disks on a 4/670 which lead to server crashes when mounting
- > the devices. I didn't find a single note in the release notes about this.
-
-
- in 4.1.2, you could set BOUNCEIO option and have VME Prestoserve handle
- the Sbus-SCSI controllers. i found this one while upgrading my 470 to
- a 670 MP. the machine ran _significantly_ slower as an MP. the fix was
- to enable a memcopy feature allowing controller-controllers to cross the
- bus lines.
-
- i no longer have a hybrid (upgraded) machine around, all of my machines
- are running 4.1.3, and are all new rev HW, so i can't look it up. 8-(
-
- bill.
-
-
-
-
- --
-
- Bill Walker - Network Analyst - Network Management Inc.
- bill@nmi.com 11242 Waples Mill Rd
- wrwalke@ddn-wms.ddn.mil Fairfax, VA 22030
-