Re: VMS analogue of FBSD and linux hier(7) man pages

In article <4670BCDF.3020600@xxxxxxxxxxx>, rgilbert88@xxxxxxxxxxx wrote:

Ron Johnson wrote:
On 06/13/07 21:26, Richard B. Gilbert wrote:
[snip]

same system disk although, in principle, you could have as many as
thirteen. A cluster could have one system disk for each node in the
cluster or small cluster could share a common system disk (disk
loading would make this impractical in a large cluster) imagine
fourteen nodes beating up the same system disk, it would run like a dog!


Only if the page/swap files, or some other important system files (audit
logs, etc) were on it, no?


How long would it take to boot thirteen nodes from the same system disk?
You may assume that each node has its own page/swap disk.

With modern systems, disks, and networks, OS startup is fast.

The main VMS development/build cluster has recently consisted of 19 nodes,
a mixture of VAX, Alpha, and Integrity. (This isn't supported, but it
works, and people who do their own support do run 3-architecture
clusters. We do our own support. :-)

The Alpha (nothing older than a DS10, IIRC) and Integrity systems all boot
from FibreChannel disks (1 or 2 Gb/sec). There's typically 1 Alpha boot
disk and 1 Integrity boot disk. I haven't timed them precisely, but I
believe they are all booted in 4 or 5 minutes. The VAXes boot from
CI-based disks, and take longer.

There are a LOT of disks. They are mostly mounted outside of the startup
process, and they are NOT all mounted on every node in 4 or 5 minutes!

The Alpha and Integrity systems usually spend more time doing HW- and
FW-based diagnostic tests than they do booting VMS.
.

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