Re: [gentoo-user] How to change from one harddrive to software raid
On Wed, Mar 30, 2011 at 8:21 PM, Einux einux...@gmail.com wrote: thank you guys, you've been helpful :) On Wed, Mar 30, 2011 at 3:31 PM, Joost Roeleveld jo...@antarean.orgwrote: On Wednesday 30 March 2011 07:28:40 Florian Philipp wrote: Am 30.03.2011 05:02, schrieb Einux: Hi, I bought a new 1T harddrive which is exactly the same as my previous harddrive. So I'm planning to make a Raid-1 layout(for security reasons). But here's the problem: I've already setup LVM2 on the existing harddrive and I don't want to destroy the existing LVM volume groups. I tried to google it, but I'm not sure which is the right keyword. Could you guys help me out? Thanks in advance:) 1. Create a degenerated RAID1 with your new disk mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb 2. Partition the raid device 3. Add one of the partitions to your LVM volume group. pvcreate /dev/sdb2 vgextend volume_group /dev/sdb2 4. Move everything from the old physical volumes to the new pv. pvmove /dev/sda3 /dev/sdb2 5. Remove the old and now empty physical volume vgreduce volume_group /dev/sda3 6. Move everything else which is not on LVM to your new raid. Guess you need to go to single user mode to do this safely. 7. Grow your raid to also contain the old disk. mdadm /dev/md0 -a /dev/sda No, I have not tested this and you should double-check everything. No guarantees, etc. One warning, though: pvmove is known to create problems from time to time. Leaking memory, bogging systems with infinite system load and so on. If it gives you trouble, you can abort it with `pvmove --abort` and try it again later by calling `pvmove volume_group` (without physical device specified) to resume it. It SHOULD survive system crashes. Trying another kernel version sometimes helps when pvmove gives you trouble. To avoid that, with large moves, do the following: # pvmove -i 600 /dev/sda3 The -i 600 means, only report every 10 minutes. It's the reporting that causes the memory leak. Also, when just wanting to empty one physical volume, it is not necessary to specify the target. It's a good idea to mark the PVs on the existing drive non-allocatable. Then LVM won't try to move anything to that PV: # pvchange -xn /dev/sda3 The rest of the steps read correct. It's how I did a similar operation, but still double-check all the parameters and when in doubt, read the manual and/or ask on the list. -- Joost Roeleveld -- Best Regards, Einux I starred this in Gmail in case I ever need to do something like this. Thanks guys!
Re: [gentoo-user] How to change from one harddrive to software raid
Am 30.03.2011 05:02, schrieb Einux: Hi, I bought a new 1T harddrive which is exactly the same as my previous harddrive. So I'm planning to make a Raid-1 layout(for security reasons). But here's the problem: I've already setup LVM2 on the existing harddrive and I don't want to destroy the existing LVM volume groups. I tried to google it, but I'm not sure which is the right keyword. Could you guys help me out? Thanks in advance:) -- Best Regards, Einux 1. Create a degenerated RAID1 with your new disk mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb 2. Partition the raid device 3. Add one of the partitions to your LVM volume group. pvcreate /dev/sdb2 vgextend volume_group /dev/sdb2 4. Move everything from the old physical volumes to the new pv. pvmove /dev/sda3 /dev/sdb2 5. Remove the old and now empty physical volume vgreduce volume_group /dev/sda3 6. Move everything else which is not on LVM to your new raid. Guess you need to go to single user mode to do this safely. 7. Grow your raid to also contain the old disk. mdadm /dev/md0 -a /dev/sda No, I have not tested this and you should double-check everything. No guarantees, etc. One warning, though: pvmove is known to create problems from time to time. Leaking memory, bogging systems with infinite system load and so on. If it gives you trouble, you can abort it with `pvmove --abort` and try it again later by calling `pvmove volume_group` (without physical device specified) to resume it. It SHOULD survive system crashes. Trying another kernel version sometimes helps when pvmove gives you trouble. Hope this helps, Florian Philipp signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] How to change from one harddrive to software raid
Am 30.03.2011 07:28, schrieb Florian Philipp: Am 30.03.2011 05:02, schrieb Einux: Hi, I bought a new 1T harddrive which is exactly the same as my previous harddrive. So I'm planning to make a Raid-1 layout(for security reasons). But here's the problem: I've already setup LVM2 on the existing harddrive and I don't want to destroy the existing LVM volume groups. I tried to google it, but I'm not sure which is the right keyword. Could you guys help me out? Thanks in advance:) -- Best Regards, Einux 1. Create a degenerated RAID1 with your new disk mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb 2. Partition the raid device 3. Add one of the partitions to your LVM volume group. pvcreate /dev/sdb2 vgextend volume_group /dev/sdb2 4. Move everything from the old physical volumes to the new pv. pvmove /dev/sda3 /dev/sdb2 5. Remove the old and now empty physical volume vgreduce volume_group /dev/sda3 6. Move everything else which is not on LVM to your new raid. Guess you need to go to single user mode to do this safely. 7. Grow your raid to also contain the old disk. mdadm /dev/md0 -a /dev/sda No, I have not tested this and you should double-check everything. No guarantees, etc. One warning, though: pvmove is known to create problems from time to time. Leaking memory, bogging systems with infinite system load and so on. If it gives you trouble, you can abort it with `pvmove --abort` and try it again later by calling `pvmove volume_group` (without physical device specified) to resume it. It SHOULD survive system crashes. Trying another kernel version sometimes helps when pvmove gives you trouble. Hope this helps, Florian Philipp Argh, of course a partition on md0 is not called sdb2. Just if that got you confused ;) signature.asc Description: OpenPGP digital signature
Re: [gentoo-user] How to change from one harddrive to software raid
On Wednesday 30 March 2011 07:28:40 Florian Philipp wrote: Am 30.03.2011 05:02, schrieb Einux: Hi, I bought a new 1T harddrive which is exactly the same as my previous harddrive. So I'm planning to make a Raid-1 layout(for security reasons). But here's the problem: I've already setup LVM2 on the existing harddrive and I don't want to destroy the existing LVM volume groups. I tried to google it, but I'm not sure which is the right keyword. Could you guys help me out? Thanks in advance:) 1. Create a degenerated RAID1 with your new disk mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb 2. Partition the raid device 3. Add one of the partitions to your LVM volume group. pvcreate /dev/sdb2 vgextend volume_group /dev/sdb2 4. Move everything from the old physical volumes to the new pv. pvmove /dev/sda3 /dev/sdb2 5. Remove the old and now empty physical volume vgreduce volume_group /dev/sda3 6. Move everything else which is not on LVM to your new raid. Guess you need to go to single user mode to do this safely. 7. Grow your raid to also contain the old disk. mdadm /dev/md0 -a /dev/sda No, I have not tested this and you should double-check everything. No guarantees, etc. One warning, though: pvmove is known to create problems from time to time. Leaking memory, bogging systems with infinite system load and so on. If it gives you trouble, you can abort it with `pvmove --abort` and try it again later by calling `pvmove volume_group` (without physical device specified) to resume it. It SHOULD survive system crashes. Trying another kernel version sometimes helps when pvmove gives you trouble. To avoid that, with large moves, do the following: # pvmove -i 600 /dev/sda3 The -i 600 means, only report every 10 minutes. It's the reporting that causes the memory leak. Also, when just wanting to empty one physical volume, it is not necessary to specify the target. It's a good idea to mark the PVs on the existing drive non-allocatable. Then LVM won't try to move anything to that PV: # pvchange -xn /dev/sda3 The rest of the steps read correct. It's how I did a similar operation, but still double-check all the parameters and when in doubt, read the manual and/or ask on the list. -- Joost Roeleveld
Re: [gentoo-user] How to change from one harddrive to software raid
thank you guys, you've been helpful :) On Wed, Mar 30, 2011 at 3:31 PM, Joost Roeleveld jo...@antarean.org wrote: On Wednesday 30 March 2011 07:28:40 Florian Philipp wrote: Am 30.03.2011 05:02, schrieb Einux: Hi, I bought a new 1T harddrive which is exactly the same as my previous harddrive. So I'm planning to make a Raid-1 layout(for security reasons). But here's the problem: I've already setup LVM2 on the existing harddrive and I don't want to destroy the existing LVM volume groups. I tried to google it, but I'm not sure which is the right keyword. Could you guys help me out? Thanks in advance:) 1. Create a degenerated RAID1 with your new disk mdadm --create /dev/md0 --level=1 --raid-devices=2 missing /dev/sdb 2. Partition the raid device 3. Add one of the partitions to your LVM volume group. pvcreate /dev/sdb2 vgextend volume_group /dev/sdb2 4. Move everything from the old physical volumes to the new pv. pvmove /dev/sda3 /dev/sdb2 5. Remove the old and now empty physical volume vgreduce volume_group /dev/sda3 6. Move everything else which is not on LVM to your new raid. Guess you need to go to single user mode to do this safely. 7. Grow your raid to also contain the old disk. mdadm /dev/md0 -a /dev/sda No, I have not tested this and you should double-check everything. No guarantees, etc. One warning, though: pvmove is known to create problems from time to time. Leaking memory, bogging systems with infinite system load and so on. If it gives you trouble, you can abort it with `pvmove --abort` and try it again later by calling `pvmove volume_group` (without physical device specified) to resume it. It SHOULD survive system crashes. Trying another kernel version sometimes helps when pvmove gives you trouble. To avoid that, with large moves, do the following: # pvmove -i 600 /dev/sda3 The -i 600 means, only report every 10 minutes. It's the reporting that causes the memory leak. Also, when just wanting to empty one physical volume, it is not necessary to specify the target. It's a good idea to mark the PVs on the existing drive non-allocatable. Then LVM won't try to move anything to that PV: # pvchange -xn /dev/sda3 The rest of the steps read correct. It's how I did a similar operation, but still double-check all the parameters and when in doubt, read the manual and/or ask on the list. -- Joost Roeleveld -- Best Regards, Einux
