This question was asked a few weeks ago, but the original poster must have had their questions amswered. As follow-ups offered further assistance given more detail, I wonder if I could be so bold as to provide that detail for my own circumstances.
I have six disks: ad4 - 500MB ad5 - 500MB ad6 - 500MB ad7 - 400MB ad8 - 500MB ad10 - 500MB These are SATA drives, with ad8 and ad10 on a PCIe SATA controller. ad7 was my first disk and currently contains FreeBSD7.2-RELEASE. I've been using that to gain some familiarity with FreeBSD, but it need not be preserved (in fact, I'd rather not preserve it!). When I built the machine, I just plugged the 400GB drive in any old slot, so it can move if that makes sense. When I got the new drives I tried to get identical to the 400GB drive, but couldn't. The 400GB drive currently has a single slice using the full drive. What I'd like to end up with is a three-way stripe across three two-way mirrors, containing as much of the system as possible. I understand that you can't boot from a stripe, so some part of some disk will have to be outside the stripe. However, as the stripe will also be limited to the smallest disk, I'm going to have 5 x 100 GB bits left over anyway, so I guess /boot can go on one of these..? If possible, I'd like set this up pre-install. If it has to be done post-install, or is easier to describe how to do post-install, then that's fine. >From here on in, this email becomes speculative. All of the examples I've seen for setting up GEOM stripes and mirrors have used the raw disk as the base-level provider. On the other hand, I've seen nothing that says that the bottom level cannot be a slice, rather than a raw disk, and given the way GEOM works, I suspect this is true. My current plan, based on this assumption, is as follows: With my current FreeBSD installation, create 2 slices on each 500GB disk, 1 x ~400GB, 1 x ~100GB (the same size as the slice of my 400GB disk, and the rest of the disk). Boot from the FreeBSD 7.2-RELEASE dvd, and enter fixit mode. I'm not sure which would be best, or even if both are feasible for what I want to do. (I was at this point in my researchwhen I found this post!). >From here, kldload geom_stripe and kldload geom_mirror. Then, create the three mirrors: gmirror label -v main0 /dev/ad4s1 /dev/ad5s1 gmirror label -v main1 /dev/ad6s1 /dev/ad571 gmirror label -v main2 /dev/ad8s1 /dev/ad10s1 This should give me /mirror/main0|main1|main2, right? Next create the stripe: gstripe label -v -s 131072 raid10 /dev/mirror/main0 /dev/mirror/main1 /dev/mirror/main2 (that's all one line) If I'm right so far, then hopefully I should be able to boot to the install dvd again (or just rerun sysnstall?), and from there I should be able to choose a slice from outside 'raid10' to mount /boot, and use 'raid10' for everything else. Do I need anything else on a non-striped slice? Maybe I could even create another mirror: gmirror label -v boot /dev/ad4s2 /dev/ad5s2 and use that to mount /boot, leaving me with s2 on ad6,8 and 10 as 3 spare 100GB slices? Or am I just way off track? PS. I can't believe I'm talking about 300 'spare' GB! My first disk was 20MB! And I never filed that! All guidance much appreciated. Phil On 30 July, 15:03, John Nielsen <li...@jnielsen.net> wrote: > On Wednesday 29 July 2009 15:54:42 Richard Fairbanks wrote: > > > OK, so this is what I want to do. I have 4 big fast drives that I want to > > run inRAID10 (1+0). So, I'll need to mirror two sets of two disks, then ... > > Of course, if there is a way to create the stripedsetoff mirrors before > > installation then installing onto that stripe, that'd be perfect. I don't > > know if that can be done. I'm sure someone has configured aRAID10 > > "standalone" system before. (Oh, I'm using 7.2). I'm just stuck at this > > point! > > You need to consider where/how you are going to boot the system. It's > straightforward to boot from a gmirror'ed UFS filesystem (the BIOS just uses > one disk and thinks everything is normal), but you can't do the same from a > stripe. You will either need a separate disk/device for your / or /boot > partition or you will need to use slices/partitions on your disks. I > frequently have the root filesystem on a small gmirror (partitions on 2 > disks) then use the equivalent "extra" space on the remaining disk(s) for > swap. > > Youi should be able to do this pre-installfrom the Fixit shell. Boot to the > live CD, enter the shell, kldload geom_mirror and geom_stripe, create the > mirrors, create the stripe, exit the shell, start theinstall, and tell > sysinstall to use the device node under /dev/stripe for your filesystem. > > Alternatively you could just do a regularinstallto one of the disks and do > everything post-install. In this case you'd still create two mirrors but one > of them would only contain a single disk at first. Then create your stripe, > dump/restore your files, update fstab (in both locations if needed), reboot > using the stripe, then add the original system disk into its mirror. > > If you provide more details of how you want your setup to look I can give you > a specific walkthrough if needed. > > JN > _______________________________________________freebsd-questi...@freebsd.org > mailing listhttp://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org" -- Ram Ram _______________________________________________ firstname.lastname@example.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"