Date: Mon, 29 Nov 1999 14:00:19 -0800 (PST) From: Kim and Chet Golding <golding@halcyon.com> To: Poul-Henning Kamp <phk@FreeBSD.ORG> Cc: small@FreeBSD.ORG Subject: Re: md - memory disk wishlist ? Message-ID: <Pine.GSO.4.20.9911291345060.23725-100000@king.halcyon.com> In-Reply-To: <23112.943907996@critter.freebsd.dk>
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Great Question! 1. Mirror or Raid mode would be very cool. 2. A cluster hook of some sort would be super if you had multiple systems and could config/treat a memory disk as a single unit and let the unit take care of passing updates to another system. (Maybe on boot this could reload itself from another systems md based on a switch-file or test-condition script in /etc... or after network was up.. failing over to something in /etc/defaults if network is unreachable..) 3. Snap effect... Something like a .bak but with versions say up to 16 working in a lifo manner. Would be good for some situations. Giving you a version cache device for sql tables or floppy build versions. Chet On Mon, 29 Nov 1999, Poul-Henning Kamp wrote: > > Hi gang, > > I'm looking for input from this crowd: what features do you want to > see from the md driver ? > > Currently it supports two modes of operation: > > 1. Preloaded images. This is like MFS_ROOT basically, > but you can muliple images and get multiple devices. > > 2. Malloc mode. Here storage is malloc(9)'ed on as needed > basis and freed back when possible (with UFS for instance). > Simple compression is performed: if a sector have all bytes > identical no storage will be alocated, only that byte value > will be stored. > > I would like to hear from the embedded people what you need from a > memory device driver in FreeBSD in the future. > > Shoot away! :-) > > -- > Poul-Henning Kamp FreeBSD coreteam member > phk@FreeBSD.ORG "Real hackers run -current on their laptop." > FreeBSD -- It will take a long time before progress goes too far! > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-small" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-small" in the body of the message
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