[opensuse] Re: setting up a raid (Suse 10.0)
John Andersen wrote: On Friday 16 March 2007, Joachim Schrod wrote: SUSE normally starts mdadm and notifies you about disk breakage. For extended supervision Nagios is even better. That has not been my experience. I've always had to take steps to make sure mdadm is started in monitor mode at each boot. On 10.0, I set up the software RAID during installation. Then mdadm was started automatically in monitor mode. I wouldn't have started it myself, since I use Nagios for complete monitoring of all hosts and services, RAID states and enough free space on filesystems included. Joachim -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Joachim Schrod Email: [EMAIL PROTECTED] Roedermark, Germany -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[opensuse] Re: setting up a raid (Suse 10.0)
Jerome R. Westrick wrote: On Thursday 15 March 2007 20:12, David Mayr wrote: Am Donnerstag, 15. März 2007 19:47 schrieb John Andersen: On Thursday 15 March 2007, James D. Parra wrote: Isn't mirroring a swap partition a bad idea, or at the least wasteful? Mirroring is not too bad for swap. When the system needs to read swap the raid drivers will read from which ever disk is not busy, so it might be faster than non-raid, but only slightly so. Mirroring swap isn't a bad idea also because your running system would break if a disk crashes with swapped data on it. I put seperate swaps one on each disk, and raid the rest. This means that the machine crashes when a disk breaks. The system then works after a reboot. In this form I Immedeatetly know when a disk breaks at one of my SOHO clients. I find that to be a major plus. SUSE normally starts mdadm and notifies you about disk breakage. For extended supervision Nagios is even better. That's the whole reason for a RAID system, to be able to repair disk failures in a scheduled and organized way without crashing a running system. Not mirroring the swap partition counters that advantage and is bad advice, IMNSHO. Joachim -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Joachim Schrod Email: [EMAIL PROTECTED] Roedermark, Germany -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
[opensuse] Re: setting up a raid (Suse 10.0)
James D. Parra wrote: Hello, I have two identical drives, mirrored as /dev/md0, however I am unable to carve out mount points on it or put a swap partition on it. One drive is a system drive and I'd like to mirror it. What is the best way to accomplish this? Normally you don't mirror drives, but partitions. I.e., you partition the two drives exactly the same way (hint: use sfdisk -d to copy the partition table) and then produce md-partitions for each pairs of them. Since you already succeeded in creating /dev/md0, I assume that you know how to do this. The enterprise-class alternative is to use Logical Volume Management (LVM). See http://www.suse.com/en/whitepapers/lvm/lvm1.html and the neighboring lvm2.html for some information. With that, you make your /dev/md0 into a physical volume (with pvcreate), add it to a volume group (vgcreate), and create several logical volumes (lvcreate) on this group. The advantage of LVM is that you can later add more disks easily to your volume group (vgextend) and enlarge existing partitions, without being restricted by disk and partition sizes. The disadvantage of LVM is that it doesn't play well with booting. You are well advised to put /boot into a (mirrored) separate partition. I hope that gets you started. Joachim -- =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=- Joachim Schrod Email: [EMAIL PROTECTED] Roedermark, Germany -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
Re: [opensuse] Re: setting up a raid (Suse 10.0)
On Friday 16 March 2007, Joachim Schrod wrote: SUSE normally starts mdadm and notifies you about disk breakage. For extended supervision Nagios is even better. That has not been my experience. I've always had to take steps to make sure mdadm is started in monitor mode at each boot. -- _ John Andersen pgpBqgs0gYphv.pgp Description: PGP signature
