Date: 23 Jan 1999 22:57:29 +1100 From: "John Saunders" <john.saunders@nlc.net.au> To: freebsd-isp@FreeBSD.ORG Subject: Re: ccd and vinum Message-ID: <19990123115729.25303.qmail@nhj.nlc.net.au> In-Reply-To: <19990123115446.A26886@freebie.lemis.com>
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Greg Lehey <grog@lemis.com> wrote: > ccd is on its way out, not in. As long as it hangs around long enough for me to figure out how to configure vinum (and to compile a RELENG_3 kernel without errors when vinum is included) I will be happy. >> Granted if a disk fails you'll have some down-time as you swap in >> new drives a rebuild the mirrors, but at least it's minimal and you >> have much less chance of loosing data than say from restoring from >> tape. > In the cases I've seen, you need to reboot the machine, reconfigure > ccd, recover manually, reconfigure ccd, possibly reboot, and then > you're back up and running again. I have a system where I ran remove the failed drive and be back running in an un-mirror configuration pretty quickly. However once I source a replacement drive there is about 40 minutes downtime to sync the new disk up. Rebuild in background would be a real time saver. >> 1) Are any of you ISP's using it, and it it stable? > I don't use it, but I believe it's relatively stable. Yes on 2 servers. At a remote POP I have one machine running modems, mail, news cache and http cache, using ccd to mirror two 4.5GB drives. Another machine is a http cache with a couple of drives with a 128 sector strip. I can get a sustained 7.5MB/sec to Quantum Fireball IDE drives. Reliability isn't an issue, it just runs. >> 2) I assume that the root partition can't be ccd. Correct? and > Correct. Can it be with vinum? That would be interesting. Currently I have to remember to manually sync up the root filesystems if I change them. I looked into it some time back. It is probably possible to have a ccd root filesystem if you hack a kernel to do the equivalent of ccdconfig and then get it to mount the ccd device as root. Although it would require substantial code hacking. > On the other hand, vinum does the right thing: if a drive fails, it > will carry on running, and you can rebuild the volumes on line. Take > a look at http://www.lemis.com/vinum.html. Sounds really good, if I can get the $%^$& thing to compile I will be happy. :-) Cheers. -- +------------------------------------------------------------+ . | John Saunders - mailto:john@nlc.net.au (EMail) | ,--_|\ | - http://www.nlc.net.au/ (WWW) | / Oz \ | - 02-9489-4932 or 041-822-3814 (Phone) | \_,--\_/ | NHJ NORTHLINK COMMUNICATIONS - Supplying a professional, | v | and above all friendly, internet connection service. | +------------------------------------------------------------+ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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