Date: Thu, 8 Apr 1999 09:59:49 +0930 From: Greg Lehey <grog@lemis.com> To: Ollivier Robert <roberto@keltia.freenix.fr>, FreeBSD Hackers <hackers@FreeBSD.ORG> Subject: Re: Separate boot partition? Message-ID: <19990408095949.G2142@lemis.com> In-Reply-To: <19990408000955.D8314@keltia.freenix.fr>; from Ollivier Robert on Thu, Apr 08, 1999 at 12:09:55AM %2B0200 References: <19990407085435.M2142@lemis.com> <19990407080113.A4122@keltia.freenix.fr> <19990407155835.M2142@lemis.com> <19990408000955.D8314@keltia.freenix.fr>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thursday, 8 April 1999 at 0:09:55 +0200, Ollivier Robert wrote: > According to Greg Lehey: >> Right, most System Vs I know with this method call it /stand. But >> that name is taken :-) On Tandem, the boot file system is (wait for >> it) bfs. It's the most stupid file system I've seen yet, but it makes >> it easier for the bootstrap to find the kernel. > > On SVR4 (at least some of the older 4.0 ones) used bfs as the filesystem > used for /stand. It is much simplier than UFS (contiguous allocation and > all that) and fits in the boot blocks. Right, that sounds the same as Tandem's bfs. But with space for two kernels, the "boot blocks" are slightly larger than on FreeBSD :-) >> Well, you *could* tell me which parts are cool and why. Then you'd >> have at least a hope of getting it. > > It is something that for some parts is akind to vinum (mirror, raid and > all) with resizing of partitions (both VxfS and HFS). The LVM module from > AIX is even better because you don't need to unmount the filesystem before > (HP does it with an extra package called OnlineJFS). I hope that we'll be able to expand ufs online with Vinum. It's a ufs issue, not a Vinum issue. > You have Physical Volumes, grouped into Volume Groups, each Volume > Group is divided into Logical Volumes and a LV can contain a > filesystem. A given filesystem is extendable within a LV and you can > enlarge a LV. > > Probably near what Veritas' stuff does. A lot of the differences are conceptual. What are volume groups? They correspond in position to plexes, but I believe they're different I think in IBM VGs (or whatever they're called there) contain the replicated data for part of a volume. A plex contains one copy of the data for the entire volume. 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-hackers" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?19990408095949.G2142>