# Instal on mdadm raid error

**URL:** <https://forums.suse.com/t/instal-on-mdadm-raid-error/7801>\
**Category:** RancherOS\
**Created:** [November 15, 2017, 6:27pm UTC](https://forums.suse.com/t/instal-on-mdadm-raid-error/7801 "2017-11-15T18:27:02Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![nexcode](https://avatars.discourse-cdn.com/v4/letter/n/e99b99/32.png) [@nexcode](https://forums.suse.com/u/nexcode)\
**Post date:** [November 15, 2017, 6:27pm UTC](https://forums.suse.com/t/instal-on-mdadm-raid-error/7801/1 "2017-11-15T18:27:03Z")

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$ sudo mdadm --create --verbose /dev/md0 --level=0 --raid-devices=2 /dev/vda /dev/vdb  
mdadm: array /dev/md0 started.

$ sudo ros install -d /dev/md0  
The file /host/dev/md01 does not exist and no size was specified.

$ ls /host/dev | grep md  
md0  
md0p1

* * *

Where did he get this device: **md01**??

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<div class="post-metadata">

**Author:** ![nexcode](https://avatars.discourse-cdn.com/v4/letter/n/e99b99/32.png) [@nexcode](https://forums.suse.com/u/nexcode)\
**Post date:** [November 16, 2017, 2:45pm UTC](https://forums.suse.com/t/instal-on-mdadm-raid-error/7801/2 "2017-11-16T14:45:40Z")

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$ cd /host/dev  
$ sudo ln -s mdop1 md01

And now it works!

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<div class="post-metadata">

**Author:** ![1386studio](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/1386studio/32/5535_2.png) [@1386studio](https://forums.suse.com/u/1386studio)\
**Post date:** [August 28, 2019, 3:06am UTC](https://forums.suse.com/t/instal-on-mdadm-raid-error/7801/3 "2019-08-28T03:06:44Z")

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Yes, it works!  
But after reboot, it can’t boot!

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<div class="post-metadata">

**Author:** ![Jason-ZW](https://sea2.discourse-cdn.com/flex022/user_avatar/forums.suse.com/jason-zw/32/4607_2.png) [@Jason-ZW](https://forums.suse.com/u/Jason-ZW)\
**Post date:** [August 28, 2019, 9:24am UTC](https://forums.suse.com/t/instal-on-mdadm-raid-error/7801/4 "2019-08-28T09:24:36Z")

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try add `ln` section in rc.local using `write_files` instructions or using `bootcmd`. [https://rancher.com/docs/os/v1.x/en/installation/configuration/running-commands/?query=boot](https://rancher.com/docs/os/v1.x/en/installation/configuration/running-commands/?query=boot)