Re: gmirror, gjournal and glabel - which order?
2009/10/13 Daniel Bye freebsd-questi...@slightlystrange.org On Tue, Oct 13, 2009 at 01:08:46AM +0300, Manolis Kiagias wrote: Daniel Bye wrote: Hi all, I'm having a hard time trying to work out which order I should set up gmirror, glabel and gjournal on a new system. I want to journal my /home partition, label all the partitions for ease of reference, and use gmirror to save me in the event a disk goes bad. I am struggling to fit the pieces together conceptually in my mind. I understand the processes involved in setting each part separately - my problem is in trying to build this up in the right order so that it all makes sense. So far, I have labelled the primary drive and set up the journal. I have edited fstab to reflect the labels and journalled file system on /home. If I now build a mirror, don't I need to alter fstab to mount that and not the stuff in /dev/label? In which case, I guess I need to build the mirror first, and then set up labels and journals? I'm going round and round in circles here and none of the stuff I've read on the web enlightens me... :-/ Any insights or suggestions would be taken as a great kindness! Dan When not mirroring, I first create the journals and then label the resulting ad.journal devices In case you are doing a gmirror device, you would not really need the separate label step - the gm device name won't change and gmirror is not affected if the device names of the individual disks change (the disks are marked as part of a mirror and scanned at startup). When you are creating the composite gmirror device you are effectively labeling it anyway i.e. gmirror label gm0... Now if you follow the usual tutorials found in the web you would be using gm0 / gm1 but you actually name it any way you wish. If you really need to label the separate gmirrored partitions, do it after setting up the mirror. Concerning the order of journals and mirroring, I create the journals first, then mirror the result. This has always worked fine for me. Thanks much, Manoli. After posting, I came to more or less the same conclusion, but it's good to get confirmation from someone who clearly knows more about this stuff than I do! I'd still be interested to hear what others think/do. As ever, thanks for your time. Dan -- Daniel Bye _ ASCII ribbon campaign ( ) - against HTML, vCards and X - proprietary attachments in e-mail / \ I've always gmirrored 1st, then created the gjournal then newfs the journal device with the -L and -J flags to label it. I'm not sure if this is correct but ufs2 has hooks into gjournal, and if the journal class inst directly below the ufs layer these hooks might not work correctly. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: gmirror, gjournal and glabel - which order?
krad wrote: 2009/10/13 Daniel Bye freebsd-questi...@slightlystrange.org On Tue, Oct 13, 2009 at 01:08:46AM +0300, Manolis Kiagias wrote: Daniel Bye wrote: Hi all, I'm having a hard time trying to work out which order I should set up gmirror, glabel and gjournal on a new system. I want to journal my /home partition, label all the partitions for ease of reference, and use gmirror to save me in the event a disk goes bad. I am struggling to fit the pieces together conceptually in my mind. I understand the processes involved in setting each part separately - my problem is in trying to build this up in the right order so that it all makes sense. So far, I have labelled the primary drive and set up the journal. I have edited fstab to reflect the labels and journalled file system on /home. If I now build a mirror, don't I need to alter fstab to mount that and not the stuff in /dev/label? In which case, I guess I need to build the mirror first, and then set up labels and journals? I'm going round and round in circles here and none of the stuff I've read on the web enlightens me... :-/ Any insights or suggestions would be taken as a great kindness! Dan When not mirroring, I first create the journals and then label the resulting ad.journal devices In case you are doing a gmirror device, you would not really need the separate label step - the gm device name won't change and gmirror is not affected if the device names of the individual disks change (the disks are marked as part of a mirror and scanned at startup). When you are creating the composite gmirror device you are effectively labeling it anyway i.e. gmirror label gm0... Now if you follow the usual tutorials found in the web you would be using gm0 / gm1 but you actually name it any way you wish. If you really need to label the separate gmirrored partitions, do it after setting up the mirror. Concerning the order of journals and mirroring, I create the journals first, then mirror the result. This has always worked fine for me. Thanks much, Manoli. After posting, I came to more or less the same conclusion, but it's good to get confirmation from someone who clearly knows more about this stuff than I do! I'd still be interested to hear what others think/do. As ever, thanks for your time. Dan -- Daniel Bye _ ASCII ribbon campaign ( ) - against HTML, vCards and X - proprietary attachments in e-mail / \ I've always gmirrored 1st, then created the gjournal then newfs the journal device with the -L and -J flags to label it. I'm not sure if this is correct but ufs2 has hooks into gjournal, and if the journal class inst directly below the ufs layer these hooks might not work correctly. I've always done it this way too (mirror then journal,) both for the reason given and because of the following from the gjournal(8) manpage: When gjournal is configured on top of gmirror(8) or graid3(8) providers, it also keeps them in a consistent state, thus automatic synchronization on power failure or system crash may be disabled on those providers. Vince ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
gmirror, gjournal and glabel - which order?
Hi all, I'm having a hard time trying to work out which order I should set up gmirror, glabel and gjournal on a new system. I want to journal my /home partition, label all the partitions for ease of reference, and use gmirror to save me in the event a disk goes bad. I am struggling to fit the pieces together conceptually in my mind. I understand the processes involved in setting each part separately - my problem is in trying to build this up in the right order so that it all makes sense. So far, I have labelled the primary drive and set up the journal. I have edited fstab to reflect the labels and journalled file system on /home. If I now build a mirror, don't I need to alter fstab to mount that and not the stuff in /dev/label? In which case, I guess I need to build the mirror first, and then set up labels and journals? I'm going round and round in circles here and none of the stuff I've read on the web enlightens me... :-/ Any insights or suggestions would be taken as a great kindness! Dan -- Daniel Bye _ ASCII ribbon campaign ( ) - against HTML, vCards and X - proprietary attachments in e-mail / \ pgpDBqKL2AYI3.pgp Description: PGP signature
Re: gmirror, gjournal and glabel - which order?
Daniel Bye wrote: Hi all, I'm having a hard time trying to work out which order I should set up gmirror, glabel and gjournal on a new system. I want to journal my /home partition, label all the partitions for ease of reference, and use gmirror to save me in the event a disk goes bad. I am struggling to fit the pieces together conceptually in my mind. I understand the processes involved in setting each part separately - my problem is in trying to build this up in the right order so that it all makes sense. So far, I have labelled the primary drive and set up the journal. I have edited fstab to reflect the labels and journalled file system on /home. If I now build a mirror, don't I need to alter fstab to mount that and not the stuff in /dev/label? In which case, I guess I need to build the mirror first, and then set up labels and journals? I'm going round and round in circles here and none of the stuff I've read on the web enlightens me... :-/ Any insights or suggestions would be taken as a great kindness! Dan When not mirroring, I first create the journals and then label the resulting ad.journal devices In case you are doing a gmirror device, you would not really need the separate label step - the gm device name won't change and gmirror is not affected if the device names of the individual disks change (the disks are marked as part of a mirror and scanned at startup). When you are creating the composite gmirror device you are effectively labeling it anyway i.e. gmirror label gm0... Now if you follow the usual tutorials found in the web you would be using gm0 / gm1 but you actually name it any way you wish. If you really need to label the separate gmirrored partitions, do it after setting up the mirror. Concerning the order of journals and mirroring, I create the journals first, then mirror the result. This has always worked fine for me. ___ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to freebsd-questions-unsubscr...@freebsd.org
Re: gmirror, gjournal and glabel - which order?
On Tue, Oct 13, 2009 at 01:08:46AM +0300, Manolis Kiagias wrote: Daniel Bye wrote: Hi all, I'm having a hard time trying to work out which order I should set up gmirror, glabel and gjournal on a new system. I want to journal my /home partition, label all the partitions for ease of reference, and use gmirror to save me in the event a disk goes bad. I am struggling to fit the pieces together conceptually in my mind. I understand the processes involved in setting each part separately - my problem is in trying to build this up in the right order so that it all makes sense. So far, I have labelled the primary drive and set up the journal. I have edited fstab to reflect the labels and journalled file system on /home. If I now build a mirror, don't I need to alter fstab to mount that and not the stuff in /dev/label? In which case, I guess I need to build the mirror first, and then set up labels and journals? I'm going round and round in circles here and none of the stuff I've read on the web enlightens me... :-/ Any insights or suggestions would be taken as a great kindness! Dan When not mirroring, I first create the journals and then label the resulting ad.journal devices In case you are doing a gmirror device, you would not really need the separate label step - the gm device name won't change and gmirror is not affected if the device names of the individual disks change (the disks are marked as part of a mirror and scanned at startup). When you are creating the composite gmirror device you are effectively labeling it anyway i.e. gmirror label gm0... Now if you follow the usual tutorials found in the web you would be using gm0 / gm1 but you actually name it any way you wish. If you really need to label the separate gmirrored partitions, do it after setting up the mirror. Concerning the order of journals and mirroring, I create the journals first, then mirror the result. This has always worked fine for me. Thanks much, Manoli. After posting, I came to more or less the same conclusion, but it's good to get confirmation from someone who clearly knows more about this stuff than I do! I'd still be interested to hear what others think/do. As ever, thanks for your time. Dan -- Daniel Bye _ ASCII ribbon campaign ( ) - against HTML, vCards and X - proprietary attachments in e-mail / \ pgpH9gEpBAJ2C.pgp Description: PGP signature
