Re: Bootstrapping Raid 5 w/GEOM
Norberto Meijome [EMAIL PROTECTED] Sent by: [EMAIL PROTECTED] 07/21/2005 03:41 PM To FreeBSD Questions freebsd-questions@freebsd.org cc Subject Re: Bootstrapping Raid 5 w/GEOM Michael Dale wrote: Norberto Meijome wrote: So, should I 1) Boot up with Disc 1, install minimal config, reboot 2) setup GEOM RAID 5 on all the discs ? 3) edit fstab to point to /dev/[what??]/[what else] instead of /ad0s1[abef] ? When I installed GEOM for a RAID 1 setup I did the following: Install FreeBSD on ad0 Boot CD and run fixit mode Setup GEOM and change fstab to gm0 Linky: http://dannyman.toldme.com/2005/01/24/freebsd-howto-gmirror-system/ Cheers Michael - that's a great bit of info. Do you know how to do RAID5 ? I read in http://www.essenz.com/support/lists/hackers/20040118/69.html about geom_raid, but it seems to be lost after that. The other alternative may be to setup a RAID1+0, but that shrinks my usable space, and I'm not sure how reliable/advisable it is to do in software. Thanks again, Beto It's not possible to use RAID 5 for bootable slice, so I would suggest: - Create a mirrored slice for the root FS - Create a RAID 5 slice for the other FS I did the same here with vinum. Also as you have 3 disks you can make a 3 disks mirror for the boot slice. The other option is to make mirror on 2 disks and on third to put swap :) Best regards, Ivailo Tanusheff Senior System administrator ProCredit Bank (Bulgaria) AD tel. +359 2 921 7161 fax +359 2 921 7110 http://www.procreditbank.bg Disclaimer: The information contained in this message is intended solely for the use of individual or entity to whom it is addressed and other authorized to receive it. It may contain confidential or legally privileged information. If you are not the intended recipient you are hereby notified that any disclosure, copying, distribution or taking any action in reliance on the contents of this message is strictly prohibited and may be unlawful. If you have received this communication in error, please notify us immediately by responding to this email and then delete it from your system. ProCredit Bank is neither liable for the proper and complete transmission of the information contained in this message nor for any delay in its receipt. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Bootstrapping Raid 5 w/GEOM
Hi all, I have a box with 4 x 120 GB EIDE drives which I want to convert to FreeBSD 5.4 ( it's an old SNAP 4500 from Snap Appliance, now owned by Adaptec, running a custom build of Linux) I want to setup software Raid 5 , and I want it to affect ALL partitions, including / (so if any one of the drives fails, it will still boot up properly). I am planning on using GEOM, but open to suggestions. I've been searching and cant find any pointers on how to set this up properly. I've been reading http://people.freebsd.org/~rse/mirror/ , but this is works for RAID 1. Could anyone offer any insights / ideas / pointers (or step by step if you so feel inclined to :-) ) on how to set this up? Thanks in advance, Beto ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bootstrapping Raid 5 w/GEOM
On Thu, 21 Jul 2005 15:11:18 +0800, Norberto Meijome [EMAIL PROTECTED] wrote: Hi all, I have a box with 4 x 120 GB EIDE drives which I want to convert to FreeBSD 5.4 ( it's an old SNAP 4500 from Snap Appliance, now owned by Adaptec, running a custom build of Linux) I want to setup software Raid 5 , and I want it to affect ALL partitions, including / (so if any one of the drives fails, it will still boot up properly). I am planning on using GEOM, but open to suggestions. I've been searching and cant find any pointers on how to set this up properly. I've been reading http://people.freebsd.org/~rse/mirror/ , but this is works for RAID 1. Could anyone offer any insights / ideas / pointers (or step by step if you so feel inclined to :-) ) on how to set this up? Thanks in advance, Beto See gmirror and geom. http://www.freebsd.org/cgi/man.cgi?query=gmirrorapropos=0sektion=0manpath=FreeBSD+5.4-RELEASE+and+Portsformat=html http://www.freebsd.org/cgi/man.cgi?query=geomapropos=0sektion=0manpath=FreeBSD+5.4-RELEASE+and+Portsformat=html ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bootstrapping Raid 5 w/GEOM
Daniel Marsh wrote: On Thu, 21 Jul 2005 15:11:18 +0800, Norberto Meijome [EMAIL PROTECTED] wrote: Hi all, I have a box with 4 x 120 GB EIDE drives which I want to convert to FreeBSD 5.4 ( it's an old SNAP 4500 from Snap Appliance, now owned by Adaptec, running a custom build of Linux) I want to setup software Raid 5 , and I want it to affect ALL partitions, including / (so if any one of the drives fails, it will still boot up properly). I am planning on using GEOM, but open to suggestions. See gmirror and geom. http://www.freebsd.org/cgi/man.cgi?query=gmirrorapropos=0sektion=0manpath=FreeBSD+5.4-RELEASE+and+Portsformat=html http://www.freebsd.org/cgi/man.cgi?query=geomapropos=0sektion=0manpath=FreeBSD+5.4-RELEASE+and+Portsformat=html Thanks for the links , but i'm not too sure what steps I ought to follow. I basically want to have the RAID 5 across ad0, ad1, ad2, ad3 , and the partitions on top of that. and then build my system on top of that (as if it were a hardare RAID controller, and I'd be installing on top of amr0s1, for example). I think this should be doable, right? So, should I 1) Boot up with Disc 1, install minimal config, reboot 2) setup GEOM RAID 5 on all the discs ? 3) edit fstab to point to /dev/[what??]/[what else] instead of /ad0s1[abef] ? or boot up with CD 1, run GEOM, build the raid 5 from here before installing anything, then install on top? thanks for your all help :) Beto ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bootstrapping Raid 5 w/GEOM
Norberto Meijome wrote: So, should I 1) Boot up with Disc 1, install minimal config, reboot 2) setup GEOM RAID 5 on all the discs ? 3) edit fstab to point to /dev/[what??]/[what else] instead of /ad0s1[abef] ? or boot up with CD 1, run GEOM, build the raid 5 from here before installing anything, then install on top? I must be missing something...how do I use GEOM to create a raid 5 setup? hmmm... ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bootstrapping Raid 5 w/GEOM
Norberto Meijome wrote: So, should I 1) Boot up with Disc 1, install minimal config, reboot 2) setup GEOM RAID 5 on all the discs ? 3) edit fstab to point to /dev/[what??]/[what else] instead of /ad0s1[abef] ? When I installed GEOM for a RAID 1 setup I did the following: Install FreeBSD on ad0 Boot CD and run fixit mode Setup GEOM and change fstab to gm0 Linky: http://dannyman.toldme.com/2005/01/24/freebsd-howto-gmirror-system/ -- Michael Dale [EMAIL PROTECTED] ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bootstrapping Raid 5 w/GEOM
On Thu, Jul 21, 2005 at 05:11:18PM +1000, Norberto Meijome wrote: Hi all, I have a box with 4 x 120 GB EIDE drives which I want to convert to FreeBSD 5.4 ( it's an old SNAP 4500 from Snap Appliance, now owned by Adaptec, running a custom build of Linux) I want to setup software Raid 5 , and I want it to affect ALL partitions, including / (so if any one of the drives fails, it will still boot up properly). I am planning on using GEOM, but open to suggestions. I've been searching and cant find any pointers on how to set this up properly. I've been reading http://people.freebsd.org/~rse/mirror/ , but this is works for RAID 1. Could anyone offer any insights / ideas / pointers (or step by step if you so feel inclined to :-) ) on how to set this up? I don't think it's possible -- the loader doesn't know about the mirror even in a mirrored / setup; it justs treats one of the disks of the mirror as 'the boot disk'. It's not until the kernel is loaded that gvinum RAID-5 can do something. So, in your case, the loader would read random RAID-5 data instead of a kernel and refuse to boot. IE, it's not possible until someone writes a RAID-5 capable loader. I would advise you to either use gmirror for booting, or define a few gvinum mirror plexes (it is possible to boot from a mirrored gvinum setup although it's tricky to get right). --Stijn -- Help Wanted: Telepath. You know where to apply. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bootstrapping Raid 5 w/GEOM
Michael Dale wrote: Norberto Meijome wrote: So, should I 1) Boot up with Disc 1, install minimal config, reboot 2) setup GEOM RAID 5 on all the discs ? 3) edit fstab to point to /dev/[what??]/[what else] instead of /ad0s1[abef] ? When I installed GEOM for a RAID 1 setup I did the following: Install FreeBSD on ad0 Boot CD and run fixit mode Setup GEOM and change fstab to gm0 Linky: http://dannyman.toldme.com/2005/01/24/freebsd-howto-gmirror-system/ Cheers Michael - that's a great bit of info. Do you know how to do RAID5 ? I read in http://www.essenz.com/support/lists/hackers/20040118/69.html about geom_raid, but it seems to be lost after that. The other alternative may be to setup a RAID1+0, but that shrinks my usable space, and I'm not sure how reliable/advisable it is to do in software. Thanks again, Beto ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bootstrapping Raid 5 w/GEOM
Stijn Hoop wrote: On Thu, Jul 21, 2005 at 05:11:18PM +1000, Norberto Meijome wrote: I want to setup software Raid 5 , and I want it to affect ALL partitions, including / (so if any one of the drives fails, it will still boot up properly). I am planning on using GEOM, but open to suggestions. I don't think it's possible -- the loader doesn't know about the mirror even in a mirrored / setup; it justs treats one of the disks of the mirror as 'the boot disk'. It's not until the kernel is loaded that gvinum RAID-5 can do something. Would the same be true (not possible to boot) for a RAID 1 + 0 with GEOM? So, in your case, the loader would read random RAID-5 data instead of a kernel and refuse to boot. IE, it's not possible until someone writes a RAID-5 capable loader. right - so that's why I couldnt find any reference to this anywhere :) I would advise you to either use gmirror for booting, or define a few gvinum mirror plexes (it is possible to boot from a mirrored gvinum setup although it's tricky to get right). I guess I could create a boot slice in 2 of the drives, mirror that with gmirror and use that to boot. Then RAID-5 the rest of the drives (minus the size of the boot partition in the other 2 drives of course). cheers, B ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
Re: Bootstrapping Raid 5 w/GEOM
On Thu, Jul 21, 2005 at 10:56:39PM +1000, Norberto Meijome wrote: Stijn Hoop wrote: On Thu, Jul 21, 2005 at 05:11:18PM +1000, Norberto Meijome wrote: I want to setup software Raid 5 , and I want it to affect ALL partitions, including / (so if any one of the drives fails, it will still boot up properly). I am planning on using GEOM, but open to suggestions. I don't think it's possible -- the loader doesn't know about the mirror even in a mirrored / setup; it justs treats one of the disks of the mirror as 'the boot disk'. It's not until the kernel is loaded that gvinum RAID-5 can do something. Would the same be true (not possible to boot) for a RAID 1 + 0 with GEOM? Hmm, tricky. I guess if you can get the disk layout to mirror that of a non-RAID one, the loader would be able to cope. Striping would be impossible (at least not unless you can guarantee that the whole of the kernel + / and /boot directory entries are available on one stripe, and even then I'm not sure). So, in your case, the loader would read random RAID-5 data instead of a kernel and refuse to boot. IE, it's not possible until someone writes a RAID-5 capable loader. right - so that's why I couldnt find any reference to this anywhere :) Probably. I would advise you to either use gmirror for booting, or define a few gvinum mirror plexes (it is possible to boot from a mirrored gvinum setup although it's tricky to get right). I guess I could create a boot slice in 2 of the drives, mirror that with gmirror and use that to boot. Then RAID-5 the rest of the drives (minus the size of the boot partition in the other 2 drives of course). Yes. While on the subject, you could use 2 drives to mirror the boot disk and have swap, and then use the same amount of space on the other two drives to mirror /usr and /var. Then use RAID-5 for your data partitions. This way you'll have speed reliability. Be aware that RAID-5 is not ideal for many-write situations (most home directories), although certainly tolerable with modern drives. --Stijn -- I wish there was a knob on the TV to turn up the intelligence. There's a knob called `brightness', but it doesn't work. -- Gallagher ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to [EMAIL PROTECTED]
