Hi Lou, Who is talking about unmounting root ? I'm just saying shrinking should be possible online as long as some conditions are met (FS usage less than X %, reduced fragmentation ...) Of course, this kind of procedure requiring a max of caution because of the high risk of data loss, I'm not sure it'll get implemented in the current tools. 2009/10/24, Lou Arnold <larnolda1@gmail.com>: > Hahaha. Brem, you and I think alike. If you can do it let me know. I don't > think people can think of a way to keep the system on-line and yet dismount > root so that LVM commands can work on it. If you can make it work, I'll buy > you a virtual beer. > Regards, > Lou. > > On Sat, Oct 24, 2009 at 10:04 AM, brem belguebli > <brem.belguebli@gmail.com>wrote: > >> It's non sense arguing that LVM is not intended for root due to the >> fact that you cannot shrink it (growing online is operational and >> works fine). >> >> This is the only thing that is not allowed, though technically could >> it be possible. >> >> >> >> 2009/10/24, Lou Arnold <larnolda1@gmail.com>: >> > Haha, Yes, it would have been nice for someone to have told me about >> LVM and >> > root. It would have saved literally days of time. But my work is >> > experimental and never with production system. In any case, now I know >> > better. >> > >> > As for the LiveCD suggestion, I did not intend to discount it. I had in >> fact >> > tried it several times, but with some success. It probably just a >> > matter >> of >> > finger problems for the failures. But I truly expected a graceful >> > dismantling process without the need of shutting down the system. >> > >> > This was in fact a good experience. When you have to dig into things to >> > understand why something works or doesn't work, you are always luckier >> than >> > if things go perfectly right from the beginning. >> > >> > Thanks to everyone for your help. >> > Lou. >> > >> > >> > >> > On Fri, Oct 23, 2009 at 5:06 PM, Brian McCullough <bdmc@bdmcc-us.com> >> wrote: >> > >> >> On Fri, Oct 23, 2009 at 01:41:23PM -0700, Lou Arnold wrote: >> >> > Ryan, Thanks for your suggestion. I know it works, but I had hoped to >> >> have a >> >> > solution that didn't stop the whole system while I fixed it. >> >> > >> >> > To Drew: >> >> > I think you were quite right when you spoke about planning the file >> >> system. >> >> > I've come to realize that my question is somewhat naive. One simply >> >> doesn't >> >> > do what I wanted to exactly because there is no easy way to dismantle >> >> > it. >> >> It >> >> > would be better to partition off some part of the OS drive and add >> that >> >> to a >> >> > new volume group (or a new logical volume group) and mount that under >> >> > "/mnt", and then add whatever partitions on new drives to that >> >> > logical >> >> > volume. That logical volume could be dismounted and worked on, >> >> > whereas >> >> > whatever is under root cannot be worked on easily. >> >> >> >> >> >> Lou, >> >> >> >> I'm surprised that you haven't yet been told that one of the first >> >> rules >> >> of >> >> LVM is "don't use it for root!" Actually, I don't really hold with >> that, >> >> but it is MUCH more important to plan what you are doing when you do >> have >> >> an >> >> LVM root partition. As you have found, you can not manipulate an LVM >> >> partition while it is mounted. ( I know, there are ways for certain >> types >> >> of >> >> filesystems, but in general, the rule holds. ) That is especially true >> >> when >> >> the partition that you want to manipulate is root ( / ). >> >> >> >> My general practice is to set up the following list of Logical Volumes >> >> ( >> >> the minimum which serves for most general purpose machines ): root, >> swap, >> >> home, usr, var. I generally allocate somewhere around 1G for the root >> >> partition. The others are sized appropriately for the environment. >> That >> >> usually leaves me a lot of free space on modern drives for "data" >> >> space. >> >> >> >> The recommendation that you should find a LiveCD at this point is >> probably >> >> one that you should respect. Playing with mounted filesystems, >> >> particularly >> >> root, can rapidly lead you down a very nasty path. >> >> >> >> >> >> Brian >> >> >> >> _______________________________________________ >> >> linux-lvm mailing list >> >> linux-lvm@redhat.com >> >> https://www.redhat.com/mailman/listinfo/linux-lvm >> >> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >> >> >> > >> >> _______________________________________________ >> linux-lvm mailing list >> linux-lvm@redhat.com >> https://www.redhat.com/mailman/listinfo/linux-lvm >> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ >> > _______________________________________________ linux-lvm mailing list linux-lvm@redhat.com https://www.redhat.com/mailman/listinfo/linux-lvm read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
