RAID0 mdadm Question
Artur Paszkiewicz
artur.paszkiewicz at intel.com
Tue May 31 06:54:24 PDT 2016
On 05/31/2016 11:41 AM, Hiroyuki Sato wrote:
> Hello
>
> NVMe Newbie question.
>
> I have two P3600 PCIe NVMe Cards.
> And I created RAID0 volume with mdadm command.
> It works fine. But after reboot, I can't mount file system it.
> It seems lost partition table.
> (No partition information)
>
> Environment
> - NVMe: Intel P3600 cards * 2
> - Linux: 4.4.0
> - OS: CentOS7
>
> Question
>
> 1, Do I need re-create file system on each Boot time?
>
> 2, If not What step is missing?
>
> generate mdadm.conf?
>
> Best regards.
>
> NVMe RAID step
>
> Basically I followed this doc
> https://communities.intel.com/community/itpeernetwork/blog/2015/10/01/how-to-use-and-benchmark-nvme-ssd-create-a-software-raid-and-analyze-performance-the-answers-are-here
>
> Step1: create container
>
> mdadm -C /dev/md/imsm0 /dev/nvme0n1 /dev/nvme1n1 -n 2 -e imsm -f
> mdadm: /dev/nvme0n1 appears to be part of a raid array:
> level=raid0 devices=0 ctime=Thu Jan 1 09:00:00 1970
> Continue creating array? y
> mdadm: container /dev/md/imsm0 prepared.
>
> Step2, create md device
> mdadm -C /dev/md0 /dev/md/imsm0 -n 2 -l 0 -c 128 -f
> mdadm: array /dev/md0 started.
>
> Step3: Create Partition
> parted /dev/md0
>
> (parted) mkpart
> Partition name? []?
> File system type? [ext2]? xfs
> Start? 0%
> End? -1
>
> (parted) p
> Model: Linux Software RAID Array (md)
> Disk /dev/md0: 800GB
> Sector size (logical/physical): 512B/512B
> Partition Table: gpt
> Disk Flags:
>
> Number Start End Size File system Name Flags
> 1 1049kB 800GB 800GB
>
> (parted) quit
> Information: You may need to update /etc/fstab.
>
> Step4: Newfs
>
> /sbin/mkfs.xfs -K /dev/md0p1 -f
>
> Step5: mount
>
> mount -o noatime,nodiratime,nobarrier /dev/md0p1 /mnt/nvme1
>
Maybe the array has not assembled automatically after reboot. Check
/proc/mdstat. Also, the device you created in step 2 could have
assembled under a different name, like /dev/md126.
Artur
More information about the Linux-nvme
mailing list