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XenServer 6.5. mdadm create doesn't create an array


Ewgeniy Nikonorov1709155114

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The version-0.90 superblock limits the number of component devices within an array to 28, and limits each component device to a maximum size of 2TB on kernel version <3.1 and 4TB on kernel version> = 3.1.

 link

 

The array was not assembled due to --metadata = 0.90, old kernel version and 3TB size.

Everything was successfully created with the command:

mdadm --create --verbose /dev/md3 --level = 1 --raid-devices = 2 /dev/sda /dev/sdb

 

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3 hours ago, Ewgeniy Nikonorov1709155114 said:

 link

 

The array was not assembled due to --metadata = 0.90, old kernel version and 3TB size.

Everything was successfully created with the command:


mdadm --create --verbose /dev/md3 --level = 1 --raid-devices = 2 /dev/sda /dev/sdb

 

Regardless, software RAID is still not a supported feature. Even if it works now there is no guaranty it will do so after an upgrade.

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1 hour ago, Tobias Kreidl said:

XenServer/Citrix Hypervisor does not support software RAID.

-=Tobias

Nevertheless, on my system, two RAID1s are already assembled for storage, the system also runs on RAID1.

Here is the output cat /proc/ mdstat:

md5 : active raid1 sdf[0] sdg[1]
      976762496 blocks [2/2] [UU]

md7 : active raid1 sdc[0] sdh[1]
      976762496 blocks [2/2] [UU]

md1 : active raid1 sde2[1] sdd2[0]
      4193216 blocks [2/2] [UU]
      bitmap: 1/128 pages [4KB], 16KB chunk

md2 : active raid1 sde3[1] sdd3[0]
      147901184 blocks [2/2] [UU]
      bitmap: 0/142 pages [0KB], 512KB chunk

md0 : active raid1 sde1[1] sdd1[0]
      4193216 blocks [2/2] [UU]
      bitmap: 6/128 pages [24KB], 16KB chunk
The question is, how do you know what is preventing you from creating the next RAID? Where should there be information about the reason for the refusal?

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