Date: Fri, 30 Oct 1998 10:48:33 +0300 From: "Mikhail A. Sokolov" <mishania@demos.net> To: Tom <tom@uniserve.com> Cc: Rich Winkel <rich@chumbly.math.missouri.edu>, stable@FreeBSD.ORG Subject: Re: RAID support in FBSD? Message-ID: <19981030104833.55472@demos.su> In-Reply-To: <Pine.BSF.4.02A.9810291312000.5325-100000@shell.uniserve.ca>; from Tom <tom@uniserve.com> on Thu, Oct 29, 1998 at 01:35:02PM -0800 References: <199810292052.OAA16290@chumbly.math.missouri.edu> <Pine.BSF.4.02A.9810291312000.5325-100000@shell.uniserve.ca>
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On Thu, Oct 29, 1998 at 01:35:02PM -0800, Tom wrote: # On Thu, 29 Oct 1998, Rich Winkel wrote: # DPT has a whole line of host based RAID controllers. They are probably # the best you can get. Very wide operating system support, so they are ^^^^^^^^^^^^^^^^^^^ Usually, DPT is __very__ slow to operate in degraded mode, which makes it way unusable when such things happen. Since the RAID (5, for instance) are supposed to be redundant/working even when in degraded mode, you want SCSI-SCSI box, something from www.infortrend.com. Let me as well issue the following phrase not proving it, since it'd need more than 2 pages of advocacy: since you will not really achieve anything more than 2mb/sec (values provided for ultra1-wide) in production environment, you really want SCSI-SCSI RAIDs which are much more easy to operate, more redundant (see Tom's definitions/disadvantages list). I neither work for infortrend, nor dpt, of course. # hardly OS depedent. # # Disadvantages: FreeBSD can't run the dptmgr software, so online # re-config and monitoring is not possible. If, you have a smart drive # enclosure, this shouldn't be a big problem. # # Advantages: a DPT PM334 is probably cheaper than a SCSI-SCSI raid unit. # It also doesn't need any precious hard bays to be mounted in either. You # also get up to 3 UW SCSI channels per PCI slot. # # > The machine would be a 400mhz xeon, a departmental server, with # > an adaptec 2940 ultra wide/fast controller. # > # > Sorry for the open-ended questions, any faq pointers would be # > much appreciated. # > # > Thanks for any help!!! # > # > Rich # > # # Tom # # # To Unsubscribe: send mail to majordomo@FreeBSD.org # with "unsubscribe freebsd-stable" in the body of the message -- -mishania To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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