Date: Fri, 20 Feb 1998 00:50:31 -0800 From: "Michael L. VanLoon -- HeadCandy.com" <michaelv@MindBender.serv.net> To: bag@sinbin.demos.su (Alex G. Bulushev) Cc: agdolla@datanet.hu (Gabor Dolla), freebsd-isp@FreeBSD.ORG Subject: Re: fault tolerant :)) setup Message-ID: <199802200850.AAA20546@MindBender.serv.net> In-Reply-To: Your message of Fri, 20 Feb 98 11:31:58 %2B0300. <199802200831.LAA13139@sinbin.demos.su>
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>> I'd like to hear opinions on fault-tolerant setups....
>> Say, you have two identical machines, one is a mail server the other is
>> the www server, and when one of them is down the other does both jobs.
>> A few years back I worked for a company which had some Digital Alpha
>> servers. Digital had a nice disk tower with an Y cable so both servers
>> were able to access the same disks. Are there such products available for
>> PCs ?
>infortrand RAID's allow fault-tolerant scheme with two or more servers,
>but it is a problem to mount the same UFS from different servers ...
>
>u can mount disk RW only for one server, after first server fail,
>the second server run fsck and mount disk (or mount disk RO) ...
>it is not good, but we use this scheme ...
>
>may be JFS :)
There have to be hardware products out there, somewhere, that work
this way, because this is they way NT clustering server works. You
must have two SCSI controllers connected to one or more (SCSI) drives.
I believe both servers are allowed to work and do dual service while
they are well. The good server takes over when the bad one fails.
Don't know if they had to do any magic to NTFS to make this work, or
if the magic happens inside the clustering services on both machines.
-----------------------------------------------------------------------------
Michael L. VanLoon mvanloon@exmsft.com michaelv@MindBender.serv.net
Contract software development for Windows NT, Windows 95 and Unix.
Windows NT and Unix server development in C++ and C.
--< Free your mind and your machine -- NetBSD free un*x >--
NetBSD working ports: 386+PC, Mac 68k, Amiga, Atari 68k, HP300, Sun3,
Sun4/4c/4m, DEC MIPS, DEC Alpha, PC532, VAX, MVME68k, arm32...
NetBSD ports in progress: PICA, others...
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