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- Newsgroups: comp.sys.hp
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!usc!cs.utexas.edu!torn!nott!bnrgate!bmers145!tcooper
- From: tcooper@bnr.ca (Terry Cooper)
- Subject: Re: clusters, etc.
- Message-ID: <1993Jan11.012310.21500@bmers145.bnr.ca>
- Sender: news@bmers145.bnr.ca
- Organization: Northern Telecom, Ltd.
- References: <28226@dog.ee.lbl.gov> <17780308@hpfcmgw.FC.HP.COM> <GJR.93Jan9083236@chamarti.ai.mit.edu>
- Date: Mon, 11 Jan 93 01:23:10 GMT
- Lines: 89
-
- In article <GJR.93Jan9083236@chamarti.ai.mit.edu> gjr@zurich.ai.mit.edu writes:
- >In article <17780308@hpfcmgw.FC.HP.COM> perry@hpfcmgw.FC.HP.COM (Perry Scott) writes:
- >
- >| From: perry@hpfcmgw.FC.HP.COM (Perry Scott)
- >| Date: Sat, 9 Jan 1993 00:05:46 GMT
- >| I don't work near the people that are investigating NFS Diskless so I'm
- >| not an expert. The negative feedback I have gotten from customers is:
- >|
- >| 1) Not industry standard
- >| 2) Diskless doesn't work through IP routers
- >| 3) CDFs are yet another implementation. It could be done with a
- >| dedicated root file system and symlinks/mountpoints.
- >|
- >| There are also some internal disadvantages to HP in supporting diskless
- >| in addition to industry standard NFS.
- >
- >We have a cluster with approximately 30 workstations (300s and 700s).
- >Before we clusterized our workstations (a few years ago), all
- >workstations booted locally and used NFS to mount the server's file
- >systems.
- >
- >We had all sort of kludges for sharing files and for having some
- >machines use specific versions, and required great pains and time when
- >updating the operating system or major software components.
- >
- >It was an incredible headache!
- >
- >The cluster software made our lives considerably easier. I usually
- >mention it to everyone who asks about HP equipment as one of the
- >strongest selling points.
- >
- >What does the cluster software buy us:
- >
- >- A reliable, consistent, fast network file system. I've had horrible
- >problems with NFS on HPs, Suns, and other hardware, and NFS is
- >considerably slower.
- >
- >- Easy upgrade and maintenance (changing /etc/netlinkrc, for example)
- >because there is only one copy of the system (or two for heterogenous
- >clusters). Any other software that allows machines to boot over the
- >network but have local swap disks could probably accomplish this as
- >well, but the cluster software does this beautifully.
- >
- >- Easy way to share configuration files and to disambiguate those that
- >should not be shared by using CDFs. The MIT AI lab also has a large
- >Sun setup, and all the /var directories and mesh of symlinks are a
- >very poor solution compared to CDFs.
- >
- >- Trivial addition of new machines to our setup. When we obtain new
- >machines, it usually takes < 10 minutes to have them working as part
- >of the cluster with everything set up. Note that this is the only
- >thing we use SAM for here, and I wish I did not have to use it for
- >this either.
- >
- >
- >I'm not so attached to cluster software that I will be unhappy with
- >anything else, but I would consider it a large step backwards to have
- >to put up with:
- >
- >- an unreliable and slow network file system,
- >
- >- having to upgrade 30 machines every time there is an operating
- >system upgrade or configuration change, rather than just one,
- >
- >- no real way to disambiguate shared files,
- >
- >- lack of software to conveniently integrate a new machine into our
- >setup.
- >
- >
- >In other words, HP, if you do away with cluster software, please make
- >sure that you don't throw away the features mentioned above.
-
- I am responsible for a small group of HP workstations, about 150 organised
- into 8 clusters. Most of these stations are 300/400s but we do have about
- 20 700s (cnodes 705/710/720, servers 730/750). This is a small sub-set of
- the corp installation of HP stations which number in the thousands. Without
- the cluster protocol, management of this number of workstations would be
- next to impossible. I know I've tried using NFS, it doesn't work for even
- a few (<50) workstations.
-
- On the point of cluster size, we have a mixed cluster of about 25 workstations
- (15 700s and 10 300/400s) with a 730 server. All workstations have internal
- disks for local swap, someting I highly recommend. The server doesn't work up
- a sweat but ethernet is proving to be too slow to handle the 700s (we are doing
- a lot of 'C' compiles, ie: heavy disk load). We will be spliting this
- workgroup into two in the next couple of weeks with the addition another server
- to reduce the load on the LAN (we are using a multiport bridge to split LAN
- traffic).
-