Date: Mon, 9 Nov 1998 14:29:15 +1030 From: Greg Lehey <grog@lemis.com> To: Bill Vermillion <bill@bilver.magicnet.net> Cc: freebsd-fs@FreeBSD.ORG Subject: Re: RAID1 Software vs Hardware Message-ID: <19981109142915.G499@freebie.lemis.com> In-Reply-To: <199811081130.GAA21734@bilver.magicnet.net>; from Bill Vermillion on Sun, Nov 08, 1998 at 06:30:17AM -0500 References: <19981108094916.T499@freebie.lemis.com> <199811081130.GAA21734@bilver.magicnet.net>
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On Sunday, 8 November 1998 at 6:30:17 -0500, Bill Vermillion wrote: > Greg Lehey recently said: >> On Saturday, 7 November 1998 at 8:31:26 -0500, Bill Vermillion wrote: >>> Greg Lehey recently said: >>>> BTW, ccd always reads from the same copy of the data, so this >>>> doesn't work. But in principle you're right. >>> Reading from two disks for different files is one of the touted >>> features of most HW implementations. >> >> Put it this way, I don't know of any other implementation, SW or >> HW, which is this primitive. ... > > You are speaking of 'ccd' when you make this statement? I trimmed > previous posters quotes - and I believe the ccd comment came from > you. Correct in both cases. Trim more and you get what I have above. > I also think that is primitive. Doing that make the drive act like > only a backup device. Right. >> Vinum has a choice of round robin (default) or always reading from >> a specific drive (which can be an advantage if you have a ramdisk, >> for example). > > Yup. I can't see much use for a RAID in RAM. :-) I don't know. RAM disks don't seem as popular as they used to be, but it's still possible. The same situation would occur if one of the plexes was remote (a thing I have on the wish list for Vinum). Greg -- See complete headers for address, home page and phone numbers finger grog@lemis.com for PGP public key To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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