Hi Guys,
I'm fairly new to Linux and I'm trying to un install a hard drive from
my Centos 5.1 box running KDE. When I built the PC, I installed two 500 gig
maxtors in the tower, then I installed Centos. Now I've decided that I want
to remove the slave drive and use it as an external backup drive - I am mounting
it into one of those external drive cases with a built in fan.
When I physically removed the drive and restarted the PC, centos would not boot
up and went into a kernel panic. I'm sure I'm supposed to somehow
unmount the thing before I do this, and that's my question - how do I
un-install the hard drive - software wise - so that on next boot up, centos
don't go crazy looking for it?
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Pam Astor wrote:> Hi Guys, > > I'm fairly new to Linux and I'm trying to un install a hard drive from my Centos 5.1 box running KDE. When I built the PC, I installed two 500 gig maxtors in the tower, then I installed Centos. Now I've decided that I want to remove the slave drive and use it as an external backup drive - I am mounting it into one of those external drive cases with a built in fan. > > When I physically removed the drive and restarted the PC, centos would not boot up and went into a kernel panic. I'm sure I'm supposed to somehow unmount the thing before I do this, and that's my question - how do I un-install the hard drive - software wise - so that on next boot up, centos don't go crazy looking for it? > >run # mount this will show the mounted partitions. find the partitions that are on the second drive and unmount them: # umount /path/to/partition if a service uses them, you'll see an error. you will need to fix the errors until you can unmount them. then comment out these partitions in /etc/fstab.
Karanbir Singh
2008-Mar-16 22:21 UTC
[CentOS] Un Installing a hard drive in a Centos 5.1 box
Pam Astor wrote:> When I physically removed the drive and restarted the PC, centos would > not boot up and went into a kernel panic. I'm sure I'm supposed to > somehow unmount the thing before I do this, and that's my question - how > do I un-install the hard drive - software wise - so that on next boot > up, centos don't go crazy looking for it?If the machine panics at boot time, there is a good chance that you installed with LVM and its got both the drives into one volume. You will need to reinstall that second harddrive, then work out the process of shrinking the filesystem down to only 1 drive, then remove the second drive. The scope of this work might be too much for an email, so I can best point you at the LVM HowTo. There are also some good lvm tips in the CentOS5 docs ( http://www.centos.org/docs/5/ ) -- Karanbir Singh : http://www.karan.org/ : 2522219 at icq
> When I physically removed the drive and restarted the PC, centos would > not boot up and went into a kernel panic. I'm sure I'm supposed to > somehow unmount the thing before I do this, and that's my question - how > do I un-install the hard drive - software wise - so that on next boot > up, centos don't go crazy looking for it?If the machine panics at boot time, there is a good chance that you installed with LVM and its got both the drives into one volume. You will need to reinstall that second harddrive, then work out the process of shrinking the filesystem down to only 1 drive, then remove the second drive. The scope of this work might be too much for an email, so I can best point you at the LVM HowTo. There are also some good lvm tips in the CentOS5 docs ( http://www.centos.org/docs/5/ ) OK this is what I have when I run mount - does it appear that I have both drives on one volume?: <!-- @page { size: 8.5in 11in; margin: 0.79in } P { margin-bottom: 0.08in } --> /dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw) proc on /proc type proc (rw) sysfs on /sys type sysfs (rw) devpts on /dev/pts type devpts (rw,gid=5,mode=620) /dev/sda1 on /boot type ext3 (rw) tmpfs on /dev/shm type tmpfs (rw) none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw) sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw) ____________________________________________________________________________________ Be a better friend, newshound, and know-it-all with Yahoo! Mobile. Try it now. http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20080316/fd9b5a4c/attachment-0002.html>
Karanbir Singh
2008-Mar-16 22:44 UTC
[CentOS] Un Installing a hard drive in a Centos 5.1 box
Pam Astor wrote:> OK this is what I have when I run mount - does it appear that > I have both drives on one volume?: > > /dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw) >what output to do you get from : pvdisplay; vgdisplay; lvdisplay and what does 'df -h' say ? does it say you have the total capacity mounted on / ? -- Karanbir Singh : http://www.karan.org/ : 2522219 at icq
----- Original Message ---- From: Karanbir Singh <mail-lists at karan.org> To: CentOS mailing list <centos at centos.org> Sent: Sunday, March 16, 2008 6:44:33 PM Subject: Re: [CentOS] Un Installing a hard drive in a Centos 5.1 box Pam Astor wrote:> OK this is what I have when I run mount - does it appear that > I have both drives on one volume?: > > /dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw) >what output to do you get from : pvdisplay; vgdisplay; lvdisplay [root at localhost ~]# pvdisplay; vgdisplay; lvdisplay --- Physical volume --- PV Name /dev/sdb1 VG Name VolGroup00 PV Size 465.76 GB / not usable 9.50 MB Allocatable yes (but full) PE Size (KByte) 32768 Total PE 14904 Free PE 0 Allocated PE 14904 PV UUID IAmE1f-dCMo-c035-cSQQ-g9yE-6yOo-mfKhHv --- Physical volume --- PV Name /dev/sda2 VG Name VolGroup00 PV Size 465.66 GB / not usable 3.56 MB Allocatable yes (but full) PE Size (KByte) 32768 Total PE 14901 Free PE 0 Allocated PE 14901 PV UUID fi5A7U-dao0-ruuP-TSc0-LfFu-7yRL-iKnwGr --- Volume group --- VG Name VolGroup00 System ID Format lvm2 Metadata Areas 2 Metadata Sequence No 3 VG Access read/write VG Status resizable MAX LV 0 Cur LV 2 Open LV 2 Max PV 0 Cur PV 2 Act PV 2 VG Size 931.41 GB PE Size 32.00 MB Total PE 29805 Alloc PE / Size 29805 / 931.41 GB Free PE / Size 0 / 0 VG UUID pwO7bQ-0eRs-W8O4-b4uf-hYe6-JIm6-27p8wu --- Logical volume --- LV Name /dev/VolGroup00/LogVol00 VG Name VolGroup00 LV UUID avhFcY-30N6-2BPz-A89X-Ai0V-v5B7-xxzhIe LV Write Access read/write LV Status available # open 1 LV Size 929.47 GB Current LE 29743 Segments 2 Allocation inherit Read ahead sectors 0 Block device 253:0 --- Logical volume --- LV Name /dev/VolGroup00/LogVol01 VG Name VolGroup00 LV UUID ZW2z5f-5x58-0vDI-ru5S-iZge-mVE6-yVp160 LV Write Access read/write LV Status available # open 1 LV Size 1.94 GB Current LE 62 Segments 1 Allocation inherit Read ahead sectors 0 Block device 253:1 And... [root at localhost ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol00 901G 6.7G 848G 1% / /dev/sda1 99M 18M 76M 20% /boot tmpfs 1.9G 0 1.9G 0% /dev/shm [root at localhost ~]# ____________________________________________________________________________________ Never miss a thing. Make Yahoo your home page. http://www.yahoo.com/r/hs -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20080316/0c6809b3/attachment-0002.html>
Karanbir Singh
2008-Mar-16 23:57 UTC
[CentOS] Un Installing a hard drive in a Centos 5.1 box
Pam Astor wrote:> [root at localhost ~]# df -h > Filesystem Size Used Avail Use% Mounted on > /dev/mapper/VolGroup00-LogVol00 > 901G 6.7G 848G 1% / > /dev/sda1 99M 18M 76M 20% /boot > tmpfs 1.9G 0 1.9G 0% /dev/shmyup, its all 1 Volume, you are going to need to shrink the lv's - then get your volgroup onto /dev/sda only. info on howto do that is in the lvm howto. also, I'd recommend you download the centos-5.1/livecd and actually do the work once booted from the livecd. shinking filesystems requires you to have the filesystem unmounted, so doing it from the livecd is the only way you are going to manage it here. -- Karanbir Singh : http://www.karan.org/ : 2522219 at icq
----- Original Message ---- From: Karanbir Singh <mail-lists at karan.org> To: CentOS mailing list <centos at centos.org> Sent: Sunday, March 16, 2008 7:57:00 PM Subject: Re: [CentOS] Un Installing a hard drive in a Centos 5.1 box Pam Astor wrote:> [root at localhost ~]# df -h > Filesystem Size Used Avail Use% Mounted on > /dev/mapper/VolGroup00-LogVol00 > 901G 6.7G 848G 1% / > /dev/sda1 99M 18M 76M 20% /boot > tmpfs 1.9G 0 1.9G 0% /dev/shmyup, its all 1 Volume, you are going to need to shrink the lv's - then get your volgroup onto /dev/sda only. info on howto do that is in the lvm howto. also, I'd recommend you download the centos-5.1/livecd and actually do the work once booted from the livecd. shinking filesystems requires you to have the filesystem unmounted, so doing it from the livecd is the only way you are going to manage it here. Dang, I was afraid you were going to say that :) Oh well, guess I'm going to have fun the next day or two learning about linux file systems. Thanks much! -- Karanbir Singh : http://www.karan.org/ : 2522219 at icq _______________________________________________ CentOS mailing list CentOS at centos.org http://lists.centos.org/mailman/listinfo/centos ____________________________________________________________________________________ Looking for last minute shopping deals? Find them fast with Yahoo! Search. http://tools.search.yahoo.com/newsearch/category.php?category=shopping -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20080316/b2160b66/attachment-0002.html>
>>>>>I'm fairly new to Linux and I'm trying to un install a hard drive from my Centos 5.1 >>>>>box running KDE. When I built the PC, I installed two 500 gig maxtors in the tower, >>>>>then I installed Centos. Now I've decided that I want to remove the slave drive and >>>>>use it as an external backup drive - I am mounting it into one of those external >>>>drive cases with a built in fan. >>>>> >>>>>When I physically removed the drive and restarted the PC, centos would not boot up and >>>>>went into a kernel panic. I'm sure I'm supposed to somehow unmount the thing before >>>>>I do this, and that's my question - how do I un-install the hard drive - software >>>>>wise - so that on next boot up, centos don't go crazy looking for it? >>>> >>>>run >>>># mount >>>>this will show the mounted partitions. find the partitions that are on >>>>the second drive and unmount them: >>>># umount /path/to/partition >>>>if a service uses them, you'll see an error. you will need to fix the >>>>errors until you can unmount them. >>>>then comment out these partitions in /etc/fstab. >>> >>>OK this is what I have when I run mount - does it appear that >>>I have both drives on one volume?: >>> >>> >>> /dev/mapper/VolGroup00-LogVol00 on / >>>type ext3 (rw) >>>proc on /proc type proc (rw) >>>sysfs on /sys type sysfs (rw) >>>devpts on /dev/pts type devpts >>>(rw,gid=5,mode=620) >>>/dev/sda1 on /boot type ext3 (rw) >>>tmpfs on /dev/shm type tmpfs (rw) >>>none on /proc/sys/fs/binfmt_misc type >>>binfmt_misc (rw) >>>sunrpc on /var/lib/nfs/rpc_pipefs type >>>rpc_pipefs (rw) >> >>If the machine panics at boot time, there is a good chance that you >>installed with LVM and its got both the drives into one volume. You will >>need to reinstall that second harddrive, then work out the process of >>shrinking the filesystem down to only 1 drive, then remove the second >>drive. The scope of this work might be too much for an email, so I can >>best point you at the LVM HowTo. There are also some good lvm tips in >>the CentOS5 docs ( http://www.centos.org/docs/5/ ) >> > >am Astor wrote: >> OK this is what I have when I run mount - does it appear that >> I have both drives on one volume?: >> >> /dev/mapper/VolGroup00-LogVol00 on / type ext3 (rw) >> >> >>what output to do you get from : >>pvdisplay; vgdisplay; lvdisplay>[root at localhost ~]# pvdisplay; vgdisplay; lvdisplay > --- Physical volume --- > PV Name /dev/sdb1 > VG Name VolGroup00 > PV Size 465.76 GB / not usable 9.50 MB > Allocatable yes (but full) > PE Size (KByte) 32768 > Total PE 14904 > Free PE 0 > Allocated PE 14904 > PV UUID IAmE1f-dCMo-c035-cSQQ-g9yE-6yOo-mfKhHv > > --- Physical volume --- > PV Name /dev/sda2 > VG Name VolGroup00 > PV Size 465.66 GB / not usable 3.56 MB > Allocatable yes (but full) > PE Size (KByte) 32768 > Total PE 14901 > Free PE 0 > Allocated PE 14901 > PV UUID fi5A7U-dao0-ruuP-TSc0-LfFu-7yRL-iKnwGr > > --- Volume group --- > VG Name VolGroup00 > System ID > Format lvm2 > Metadata Areas 2 > Metadata Sequence No 3 > VG Access read/write > VG Status resizable > MAX LV 0 > Cur LV 2 > Open LV 2 > Max PV 0 > Cur PV 2 > Act PV 2 > VG Size 931.41 GB > PE Size 32.00 MB > Total PE 29805 > Alloc PE / Size 29805 / 931.41 GB > Free PE / Size 0 / 0 > VG UUID pwO7bQ-0eRs-W8O4-b4uf-hYe6-JIm6-27p8wu > > --- Logical volume --- > LV Name /dev/VolGroup00/LogVol00 > VG Name VolGroup00 > LV UUID avhFcY-30N6-2BPz-A89X-Ai0V-v5B7-xxzhIe > LV Write Access read/write > LV Status available > # open 1 > LV Size 929.47 GB > Current LE 29743 > Segments 2 > Allocation inherit > Read ahead sectors 0 > Block device 253:0 > > --- Logical volume --- > LV Name /dev/VolGroup00/LogVol01 > VG Name VolGroup00 > LV UUID ZW2z5f-5x58-0vDI-ru5S-iZge-mVE6-yVp160 > LV Write Access read/write > LV Status available > # open 1 > LV Size 1.94 GB > Current LE 62 > Segments 1 > Allocation inherit > Read ahead sectors 0 > Block device 253:1 > >And... > >[root at localhost ~]# df -h >Filesystem Size Used Avail Use% Mounted on >/dev/mapper/VolGroup00-LogVol00 > 901G 6.7G 848G 1% / >/dev/sda1 99M 18M 76M 20% /boot >tmpfs 1.9G 0 1.9G 0% /dev/shm >[root at localhost ~]#>yup, its all 1 Volume, you are going to need to shrink the lv's - then >get your volgroup onto /dev/sda only. info on howto do that is in thel>vm howto. also, I'd recommend you download the centos-5.1/livecd and>actually do the work once booted from the livecd. shinking filesystems >requires you to have the filesystem unmounted, so doing it from the >livecd is the only way you are going to manage it here.OK when you say livecd, do you mean the Centos 5.1 distro disks? I have a full set of them, a 7 disk set I got from Linux Central. Can I just boot off disk 1 from my set? ...or, if I left the install the way it is now, are there any dis advantages of leaving the file system the way it is - spread over two hard drives? Should just get another hard drive and back it up the way it is? Would ther be any problems with my backup if left the way it is? Or ahould I just do a complete re install of the OS after backing up my data... What do you reccomend -leave it as is, re configure it, or re install it? _________________________________________________________________ How well do you know your celebrity gossip? http://originals.msn.com/thebigdebate?ocid=T002MSN03N0707A