After a restart which stalled, I did a hard reboot and now mdadm can't see the RAID 6 array anymore, LVM can't find the volume which was on that raid array.
As I understand it, it's best practice to set the drive flags as "raid" before adding them to a mdadm raid array. Okay fine, but I also heard people say that they didn't do this and mdadm worked fine. Does mdadm auto-add the raid flag once you add the drives to the array and begin building? Is there any benefit to using the raid flag since it appears mdadm seems to work with or without it?
So this is the first time I'm using RAID and I started with a 2x2TB RAID-5 array since I only had two disks at the time.
Hi there:
Thanks for reading this thread and I thank you in advance for any help you can provide.
So this is what happened... I noticed that my MDADM RAID 5 array with drives ordered: /dev/sd[EFGHIABCDKJ]1 reported a failed drive -- /dev/sdb1. I stopped the array and ran smartctl -t long /dev/sdb1 and received a pass.
Haven't run into this situation before but it seems simple enough. Looking for advice/guidance on the following issue.
I have an Ubuntu 11.10 64-bit server that is configured with 2 identical hard drives in a RAID-1 through the mdadm utility. It's a simple LAMP server that runs a few projects I'm working on but is growing out of the current storage.
A while back I created a RAID 6 array consisting of 5 2TB drives and formatted it with XFS and set up the block and stripe size appropriately.
Yesterday I added two more 2TB drives to the array and it is almost done reshaping the array. While running that I realized that XFS is optimized for the number of drives, and so far as I can tell there is no way to change that after the fact.
I asked this on askubuntu.com as well but since it's a server question, figured I'd throw it on SF, too.
Haven't run into this situation before but it seems simple enough. Looking for advice/guidance on the following issue.
I have an Ubuntu 11.10 64-bit server that is configured with 2 identical hard drives in a RAID-1 through the mdadm utility.
I have a 4x 2tb raid 5 mdadm array which I had begun to grow onto a 5th disk.
~# mdadm --add /dev/md1 /dev/sdb
~# mdadm --grow /dev/md1 --raid-devices=5
midway through the grow I recieved this in an email;
A Fail event had been detected on md device /dev/md/fubox:1.
It could be related to component device /dev/sdf.
Faithfully yours, etc.
P.S.
I have an odd problem.
I have an MDADM RAID-5 array with 9 2TB devices. The MD device is formatted ext3. I have 16TB of usable space and 2TB of parity.
I decided to add a 10th 2TB device to increase space. So I added one to the array.
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