You really kinda need the original mdadm.conf file. But, as you don’t have it, you’ll have to recreate it. First, before doing anything, read up on mdadm via its manual page. Why chance losing your data to a situation or command that you didn’t have a grasp on? That being said, this advice is at … Read more
You actually part answered this in your question. The lowest form of RAID is RAID 1. RAID 0 was added well after RAID was defined (can’t find reference to a date for this though) The 0 in RAID 0 is used to signify that actually it isn’t considered redundant. Think of it as more True/False … Read more
Here’s how you can get the percentage/status back: Select one of the raid drives in the Disk Management. Then on the right (with Windows 7 Professional) I have the option “More Actions”, when I click that there popups a new menu with the option: Refresh. With that action I got the percentage back, it’s still … Read more
How does the RA setting get passed down the virtual block device chain? It depends. Let’s assume you are inside Xen domU and have RA=256. Your /dev/xvda1 is actual LV on the dom0 visible under /dev/dm1. So you have RA(domU(/dev/xvda1)) = 256 and RA(dom0(/dev/dm1)) = 512 . It will have such effect that dom0 kernel … Read more
Yes, a functional checksummed filesystem is a very good thing. However, the real motivation is not to be found into the mythical “bitrot” which, while does happen, is very rare. Rather, the main advantage is that such a filesystem provide and end-to-end data checksum, actively protecting you by erroneous disk behavior as misdirected writes and … Read more
This is a simple way to tell if GRUB is installed. If it doesn’t work your file command’s database is likely out of date and you can either update the its database or use an alternate method from another answer. You can use file to identify GRUB in an MBR. e.g. # file -s /dev/sda … Read more
Your current setup is like this: “https://serverfault.com/” /var | /usr | /home | ————————– | LVM Volume | ————————– | RAID Volume | ————————– | Disk 1 | Disk 2 | Disk 3 | It’s a much simpler setup with more flexibility. You can use all of the disks in the RAID volume and slice … Read more
If your array is md0 then echo “idle” > /sys/block/md0/md/sync_action ‘idle’ will stop an active resync/recovery etc. There is no guarantee that another resync/recovery may not be automatically started again, though some event will be needed to trigger this. http://www.mjmwired.net/kernel/Documentation/md.txt#477
I prefer HW raid, ’cause if you have to pull good disks out of a dead machine you’re not limited to the OS configuration of the raid “array”. You do keep backups of your RAID controllers config, don’t you? So just load that up on a donor machine, slot in the drives (in the right … Read more