Thanks for your great info, the only problem is that I don't want to cause any trouble to my current system and I needed to fix this quickly. I already install the system and everything is working, I have to built a system and test your procedure step by step.
This info u give to us is very important, I had done this with Linux before, and is easy, but with FreeBSD is the first time I need to do this. I will let u know my results ASAP. Thanks again for your help Jerry. On Thu, Feb 5, 2009 at 2:23 PM, Jerry McAllister <jerr...@msu.edu> wrote: > On Thu, Feb 05, 2009 at 12:19:13PM -0800, perikillo wrote: > > > Hi people. > > I have been googling without any good info about: How to shrink a > slice? > > > > Case: I installed a new server for mysql, is working, I already > install > > all the ports I need, them I spend a lot of hours yesterday with this > baby, > > now this is my current disk layout: > > > > /dev/ad0s1a on / (ufs, local, noatime, soft-updates) > > devfs on /dev (devfs, local) > > /dev/ad0s1f on /tmp (ufs, local, noatime, soft-updates) > > /dev/ad0s1d on /usr (ufs, local, noatime, soft-updates) > > /dev/ad0s1e on /var (ufs, local, noatime, soft-updates) > > /dev/ad0s1g on /backups (ufs, local, soft-updates) > > > > What I want to do is to shrink the slice /dev/ad0s1g > > /dev/ad0s1g is a partition, not a slice. > /dev/ad0s1 is the slice. > > MicroSloth usage of the terms is different and confuses people sometimes. > > As far as I know neither growfs(8) nor tunefs(8) can shrink the disk > allocated to a partition. > > The only way is to dump each of the filesystems to some other > reliable media (maybe tape or a large USB disk) and then repartition > that slice to be the sizes you want. Use dump(8) to make the dumps > and then check the dump files out before starting the repartitioning. > > First you have to build a filesystem on the USB drive. > You should be able to use bsdlabel to create a single partition > that covers the whole drive. > > But, if your FreeBSD or BIOS is old enough it might not go that big, > so you will need to break it down in to smaller slices and make a > partition in each. (I have had to do that. But if it is 7.xx it > should not be necessary) To break it up, get the gparted utility. > Download its boot image and use it to break up the USB disk in to > slices that your FreeBSD will handle. You need to have it make all > what it calls (in the MS way) Primary Partitions, but those are what > are called slices in FreeBSD land. > > Don't get tempted to use gparted to shrink your ad0s1 slice because > it will not work right. That will just trash the current partitions. > It is not what you are looking for. > > Either if your FreeBSD will handle the whole USB or after you have it > broken up, then build a partition on each slice of the USB using bsdlabel. > Don't make it bootable or write a boot sector on it. Then run newfs(8) > on it to make a filesystem. > This bsdlabel and newfs can be done while the system is running. > > Then, take the system down and run the dumps. You can do the dumps > from single user mode or boot a fixit image from the install CD. > You will need to do the repartitioning and restore the dumps from > the fixit anyway so you could just start there. > Boot the machine from the fixit disk - create a 'holographic' image as > they call it. Fixit is usually on disc1. > > Run the dumps. > Lets say you are doing the dumps to a USB drive that comes up > as /dev/da0 in the fixit boot and your current disk still is > comes up with the name /dev/ad0 . > > First, make up mount points for all your filesystems that you want to > dump plus for the filesystem[s] on the USB drive. > NOTE: That the fixit runs from a memory resident filesystem so whatever > you create there will disappear on boot. > > Anyway, skip dumping /tmp and /dev is a pretend filesystem. > > mkdir /oldroot > mkdir /oldusr > mkdir /oldvar > mkdir /oldbkup > > mkdir /usbdrive > > (You can actually make the dumps from the devices rather than mounting > them, but I have never gotten in to that habit) > > Mount those partitions > > mount /dev/ad0s1a /oldroot > mount /dev/ad0s1d /oldusr > mount /dev/ad0s1e /oldvar > mount /dev/ad0s1g /oldbkup > > mount /dev/da0s1 /usbdrive (This device name might be different > depending on how you make it. Some possibilities are: > /dev/da0s1 If you just newfs the slice without making a partition > in it > /dev/da0s1a If you make a slice with fdisk and a partition with > bsdlabel > /dev/da0a If you make a partition with bsdlabel without making a > slice > > Now do the dumps > > dump 0af /usbdrive/rootdump /oldroot > dump 0af /usbdrive/usrdump /oldusr > dump 0af /usbdrive/vardump /oldvar > dump 0af /usbdrive/bkupdump /oldbkup > > This will take a while depending on media you use. > By the way, to tape it would go to /dev/nsa0 rather than /usbdrive/oldroot, > etc > > Once the dumps are done, you may want to reboot and mount that USB > drive or read the tape and look at the dumps to make sure they can > be read. Just a precaution. > > At least you will need to unmount all the partitions so bsdlabel > can work on them > > Anyway, once you are happy with your dumps, then get back in to > the fixit and use bsdlabel to rewrite the partitions. > > Just bsdlabel -e ad0s1 > > (You should not need to write a new boot block as this process should > not touch that sector) > > Adjust the partitions as you see fit. Make partition 'a' start > at offset of 0 and use a '*' for the rest of the offsets. > bsdlabel will calculate them correctly. You can also make the > size of the last partition be '*' and bsdlabel will put the remainder > of the usable space in it. > > Write/Quit out of the bsdlabel editor -- just like vi. > > Now you need to do a newfs for each partition except for swap. > > Just take the defaults. Do: > > newfs /dev/ad0s1a > newfs /dev/ad0s1d > newfs /dev/ad0s1e > etc for how many you made. > > Once that is done, you need to mount up the partitions > and restore the dumps. > Remember that if you rebooted the fixit from when you first > made the mount points, you will have to make them again and > remount things. > > Restores will look like: > > cd /oldroot > restore -rf /usbdrive/rootdump > cd /oldusr > restore -rf /usbdrive/usrdump > cd /oldvar > restore -rf /usbdrive/vardump > cd /oldbkup > restore -rf /usbdrive/bkupdump > > If you created a new partition while doing this, there is currently > nothing to put in it. You will need to reboot and then you can > split things up and move data as you see fit. > > ////jerry > > > > > > > Filesystem 1M-blocks Used Avail Capacity Mounted on > > /dev/ad0s1a 495 232 223 51% / > > devfs 0 0 0 100% /dev > > /dev/ad0s1f 495 0 456 0% /tmp > > /dev/ad0s1d 5967 4225 1264 77% /usr > > /dev/ad0s1e 15863 1343 13251 9% /var > > /dev/ad0s1g 272313 48823 201704 19% /backups > > > > Like u can see, is the last slice I have, is posible to remove that > slice > > and create a new one? > > > > I don't have info there yet and is not a freebsd default slice, I know > > that I need to umount first. > > > > I have been reading some post but all I have seen is that ins not > possible > > or I'm wrong? > > > > I try to with sysinstall looks like don't let me do this. > > > > Running FreeBSD 7.1-p2. > > > > Thanks all for your time!!! > > _______________________________________________ > > 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" > _______________________________________________ email@example.com mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"