Date: Fri, 19 Jun 1998 20:47:40 -0400 (EDT) From: alex@nac.net To: Simon Shapiro <shimon@simon-shapiro.org> Cc: Chris Parry <laotzu@juniper.net>, freebsd-questions@FreeBSD.ORG, freebsd-SCSI@FreeBSD.ORG Subject: RE: DPT support binaries - How to Setup Message-ID: <Pine.BSF.3.96.980619203317.24846M-100000@iago.nac.net> In-Reply-To: <XFMail.980619154837.shimon@simon-shapiro.org>
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Just some notes...
> The DPT controller creates and manages RAID array in a manner totally
> transparent to the (ANY) operating system. Say, you have 45 disk drives,
ANY operating system that has a drive for the SCSI card. Like, remember
the FreeBSD didn't have a driver for it until recently.
> 1 RAID-0 array to be used for swap, /tmp, /var/tmp, /usr/obj, etc.
> RAID-0 is very fast, but if any disk in the array fails, the whole
> array will lose its data. For the indicated use, this is acceptable
> to us (Remember, this is just an example).
> We do not need an awful lot of space, but we need the speed of at
> least 15MB/Sec, so we will use 6 drives here.
Is this bright? Couldn't this panic the system in an event of a failure?
> 1 Huge RAID-0 array to contain news articles. Again, we do not care if
> we loose the article. This array needs to be big and as fast as
> possible. We will use 33 disk drives here.
Also, I think this is a bad idea; at least make three 11-drive arrays
(RAID-0 is ok, but this way if you lose *1* disk, you don't lose the
ENTIRE spool, only a third -- and, you lose no storage space). With news
servers like breeze, this is very easy.
> 1 Huge RAID-5 array to contain our E-mail. We need reliability and
> capacity, so we will use 33 drives here. In reality, RAID-5 arrays
> are not so effective at this size, but this is just an exadurated
> example.
You are putting news and mail on the same machine?
> What does the DPT do in case of disk failure?
Usually kernel panic on bootup, but thats irrelevant.
> Typically, the user who buys a $3,000.00 disk controller, attaching it to
The most expensive 3334/UDW is like $1800.
>
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