I suggest you backup every thing first. A single mistake will be big trouble. On Jan 31, 2008 4:00 AM, John J. Culkin <culkinj3@xxxxxxxxxxxx> wrote: > If I have 2 disk in a software raid, should I use "dd" to make sure > that they have the same Master Boot Record? > > > -- John C. > > Broekman, Maarten wrote: > > If the disks are hotswap capable, you won't need a restart. If the > > disks are not hotswap capable, then you'll need to shut down the system > > to replace them. > > > > The best thing would be to recreate the partitions exactly the same on > > the new disks first to make sure everything is still working fine. Then > > increase the size of the partitions through fdisk and expand the > > filesystem with resize2fs. > > > > Maarten Broekman > > > > -----Original Message----- > > From: redhat-list-bounces@xxxxxxxxxx > > [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of John J. Culkin > > Sent: Wednesday, January 30, 2008 10:44 AM > > To: General Red Hat Linux discussion list > > Subject: Re: Increasing Space in Software Raid > > > > Thanks for the replys > > > > Isn't it a little more complicated then that. I would have to make > > partitions on the new device and then I would have to expand then later > > > > Let me see if I can get a little Betty Crocker recipe here so that we > > are all on the same page > > > > #Fail on device > > mdadm --fail /dev/sda1 > > #Remove the failed drive and then replace it with a larger disk > > # mount the disk and format it (would I need a restart in there?) > > # Here is where it gets a little tricky for me > > # I think I need to make matching partitions on the larger device so > > that I can bring it into the RAIDs (one for /boot, one for / root) > > #once that is rebuild I will break the raid again so that I can remove > > the remaining smaller disk > > #I will then insert the new disk and mout and formate it > > # before I bring the new disk into the raid I will want to grow the size > > > > of the / root raid - this will also mean that I will have to grow its > > partition - any tips on that? > > > > Am I missing anything? > > > > -- John C. > > > > Broekman, Maarten wrote: > > > >> The easiest way would be to break the mirror. Replace the non-live > >> device with the new drive. Make a new metadevice with the new device. > >> Copy the data. Remove the last old device and put in the second new > >> device. Then re-mirror. > >> > >> To make life easier you might want to use LVM also rather than raw > >> metadevices on the new devices. > >> > >> Maarten Broekman > >> > >> -----Original Message----- > >> From: redhat-list-bounces@xxxxxxxxxx > >> [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of > >> culkinj3@xxxxxxxxxxxx > >> Sent: Tuesday, January 29, 2008 9:38 PM > >> To: redhat-list@xxxxxxxxxx > >> Subject: Increasing Space in Software Raid > >> > >> Hello > >> > >> I have a server running RHEL 4 and it has a software Raid (1) of 2 250 > >> gb Sata disks. I want to upgrade this to two 750 gb disks in a Raid 1 > >> configuration. There is not another SATA slot available. > >> > >> Here is some more information > >> > >> # df -ah > >> /dev/md1 229G 196G 21G 91% / > >> none 0 0 0 - /proc > >> none 0 0 0 - /sys > >> none 0 0 0 - /dev/pts > >> usbfs 0 0 0 - /proc/bus/usb > >> /dev/md0 99M 11M 83M 12% /boot > >> none 505M 0 505M 0% /dev/shm > >> none 0 0 0 - /proc/sys/fs/binfmt_misc > >> automount(pid2042) 0 0 0 - /var/autofs/bacula > >> /dev/sdc1 451G 340G 88G 80% /mnt/usb > >> # > >> cat /proc/mdstat > >> Personalities : [raid1] > >> md1 : active raid1 sda3[0] > >> 242983040 blocks [2/1] [U_] > >> > >> md0 : active raid1 sda1[0] > >> 104320 blocks [2/1] [U_] > >> > >> unused devices: <none> > >> > >> > >> # cat /etc/fstab > >> /dev/md1 / ext3 defaults > >> 1 1 > >> /dev/md0 /boot ext3 defaults > >> 1 2 > >> none /dev/pts devpts gid=5,mode=620 > >> 0 0 > >> none /dev/shm tmpfs defaults > >> 0 0 > >> none /proc proc defaults > >> 0 0 > >> none /sys sysfs defaults > >> 0 0 > >> LABEL=SWAP-sdb2 swap swap defaults > >> 0 0 > >> LABEL=SWAP-sda2 swap swap defaults > >> 0 0 > >> /dev/sdc1 /mnt/usb ext3 defaults > >> 0 0 > >> > >> > >> Any suggestions/tips? > >> > >> -- John C. > >> > >> > >> > > > > > > -- > John J. Culkin Systems Administrator > John.Culkin@xxxxxxxxxxxx The University of Scranton > Phone: (570) 941-7665 > > -- > redhat-list mailing list > unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe > https://www.redhat.com/mailman/listinfo/redhat-list > -- Nilesh Vaghela ElectroMech Redhat Channel Partner and Training Partner 74, Nalanda Complex, Satellite Rd, Ahmedabad 25, The Emperor, Fatehgunj, Baroda. www.electromech.info -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
