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List: freebsd-scsi
Subject: RE: DPT management binaries for FreeBSD?
From: Simon Shapiro <shimon () simon-shapiro ! org>
Date: 1998-08-18 21:31:26
[Download RAW message or body]
On 18-Aug-98 Charles Owens wrote:
> On Sat, 15 Aug 1998, Simon Shapiro wrote:
>
>>
>> On 13-Aug-98 Charles Owens wrote:
>> > Simon,
>> >
>> > I looked under ftp://ftp.simon-shapiro.org/crash/tools and noted
>> > a number of FreeBSD binaries with names like "dtp_dm". Could this per
>> > chance be the native mgmt software that Tom is talking about below?
>> >
>> > If so, do I need a /dev/dpt? How can a make one (/dev/MAKEDEV doesn't
>> > know anything about it, of course)?
>>
>> These will not work in 2.2, only in 3.0-current; Too much retrofitting
>> for
>> what is considered a stable version of the O/S.
>
> Okay then, two questions:
>
> 1. Without these tools is there any way for me, with a 2.2-stable system
> to:
> * determine array status (e.g. "drive 3 has failed")
Smart Alec Reply: Listen to the beeps. They indicate (really) controller,
bus, target.
Serious Answer: You are right, and I am working on it. I will probably
release it on 3.0, as 2.x is a stable release for which new
functionality is not destined.
> * issue basic commands like "rebuild array" or "make drive X
> a hot spare."
See Serious Answer above.
> I'm mostly interested in being able to fully recover from a single drive
> failure without having to reboot and run the DOS Storage Manager.
>
> ... and no, I don't have DPT drives and enclosures (grrr...) which I
> understand would take care of this for me.
Took the words out of my mouth :-). With DPT enclosures, you will find
that the number of failures is reduced dramatically. Call me at home for
details on how to acomplish that a bit easier.
> 2. Would you consider 3.0-current generally stable enough for me to
> use for a large storage system? (about 52 GB usable space, 4 RAID-5
> arrays ccd'd together, as you suggested) It will be doing little
> other
> than serving up this disk space to a handfull of other FreeBSD boxes
> via NFSv2.
I do not know the state of the NFS these days. My experience with the DPT
driver and the kernel, is that I can load 3.0 much heavier than a 2.2
kernel.
This last sentense is in conflict with the official FreeBSD policy of
strongly discuraging production work on 3.0. My advise here is to always
test a new 3.0 kernel, heavily, before putting it on a production machine.
Heck, this is good advise for ANY software version :-)
> If I did use 3.0-current, will these tools from your ftp site allow me
> to do what I describe above?
Not yet, but as soon as they are functioning properly you will.
Simon
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