On 5/5/21 12:56 AM, Thorsten Schierer wrote:
I'm currently evaluating the possibility of moving my workstation to
Qubes OS and ran into a problem.
It's using an SSD for Qubes OS, but I want to use HDDs with RAID6 to
hold qubes data.
I've been using the secondary storage guide and slightly altered it for
RAID6:
I ran "sudo cryptsetup luksFormat --hash=sha512 --key-size=512
--cipher=aes-xts-plain64 --verify-passphrase /dev/sdx" for 5 test HDDs.
I'm not an expert on this, but why do you cryptsetup each HDD instead of
cryptsetup the RAID device? The data on HDD still should be encrypted. ;-)
Then I added their UUID to /etc/crypttab and rebooted.
After than I ran "sudo pvcreate /dev/mapper/luks-[UUID]" for the 5 drives.
I created a volume group with "sudo vgcreate qubeshd0
/dev/mapper/luks-UUID1 /dev/mapper/luks-UUID2 ...."
Then I did this:
sudo lvcreate -i 3 --type raid6 -L 10G -n poolhd0 qubeshd0
sudo lvconvert --thinpool qubeshd0/poolhd0
sudo lvextend -l +100%FREE qubeshd0/poolhd0
This seems to give me a RAID6 thin pool with the correct size. I created
VMs and used this pool for data storage and everything seems to work
fine. So far so good.
After that I wanted to go through some other scenarios like adding HDDs
to the RAID (growing it) or replacing faulty hdds.
I was able to add a new HDD to the volume group but after that I got
stuck, since I was unable to add the new free space to the RAID6.
You want to extend the RAID, , i.e. the PV, not add a single HDD as PV,
right?
Everything I tried gave me an error. One of them was that thin pool did
not support the operation. I also tried it without converting to thin
pool but still was unable to extend the RAID6.
I think you must reserve "RAID slots" (number of disks to expect" when
creating the RAID. Maybe you can tune that later, but I'm unsure.
Things like this are the reason why I wanted to simulate/evaluate
everything first before actually moving everything.
How can I extend the 5 hdd RAID6 to 6 hdds (and higher)? Over time the
final target would be to grow the RAID to around 10-12 HDDs.
Was that even correct how I implemented it? What would be the best way
to accomplish it?
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