Hello Ritessh Yes, you're right, there is a lot of information and posibilities.
I did open the bug cause I couldn't find the reason nor the information of how to stack this. After your guidelines I did test it and find some options. The info was just to add some examples for someone new to do this, a stacking in practice, not a complete guide. Thanks for your work and help! Best regards, -- Carlos Barros. On mar, 2021-12-21 at 15:07 +0530, Ritesh Raj Sarraf wrote: Hello Carlos, The thing about these documentations is that there is a lot of combinations. As you must be aware, Linux Storage is stacked up of multiple independent components, tied tightly together to work in unison. This often need a good understanding of each involved stack, as well as the overall desired solution. Documenting everything is beyond the scope, especially for a general purpose universal distribution like Debian. I have, in the past, personally relied on the Red Hat Storage Admin Guide. They do a good job of documenting all the combinations and ensuring that the documents are valid and up-to-date. https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/index On Mon, 2021-12-20 at 16:03 +0000, BARROS FERNANDEZ, Carlos wrote: Hi Ritessh. On another server I have a stranger setup :) : 1 LVM over multipath + 1 LVM over mdadm-device and the mdadm-device over multipaths Did had problems because the mdadm-device did not setup the multipath, just the /dev/sdX devices In this case, mdadm was called from udev as soon as a block device was setup, so it always started the software-raid on /dev/sdX What I did was tell mdadm to not setup any block devices, only devices belonging to /dev/disk/by-id/dm-name-* because of the 'friendly-names' used un multipath. I spent some time to figure it out. The file /etc/mdadm/mdadm.conf should have a 'DEVICES' line that tells mdadm to only read those devices as follows: DEVICE /dev/disk/by-id/dm-name-* # definitions of existing MD arrays ARRAY /dev/md/0 metadata=1.2 UUID=d7285198:51ed20e4:7d1e82e6:b01569dd devices=/dev/disk/by-id/dm- name-* name=pandora:0 In this case, it is simpler, but it is very different from LVM as to where it must be set.(I find it clearer too) Also, the filter in LVM only takes care of the /dev/sd[b-z) disks, but it is common to have several paths( and disks) like /dev/sda[a- z] /dev/sdb[a-z] and so on. That filter would not filter out /dev/sda[a-z]*, it will use them. So I did change the rule in LVM to include those cases, one for /dev/sda[a-z] and one for /dev/sd[b-z] that covers the extra devices. filter = [ "a|/dev/mapper/|", "r|/block/|", "r|/disk/|", "r|/sd[b- z].*|", "r|/sda[a-z].*|", "a|.*|" ] Would you modify the info to reflect the 'modified' filter rule? 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