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12

/dev/md2 is your root file system, so if you would just format this it means your server would be gone for good. So this is a very good reason why mkfs refuses to format a running, mounted file system. Seeing your question backing up and restoring the server is entirely out of the scope of your abilities right now. Since you don't have any data yet on this ...


5

To be clear: "mkfs" deletes everything on the partition (what we usually call "formatting"). You can only "format" an unmounted (unused) partition, and you can't unmount your root (system) partition. Your only option is to re-run the install from scratch, and when setting up your disks change the default options. However, I don'...


3

You're thinking of RAID as being more magical than it is. Once the RAID is set up and working, then from a practical standpoint, there is absolutely no difference between a partition on a RAID device and a partition on any other kind of device. So, to reformat a RAID partition, you would first need to unmount it just like any other mounted partition, with ...


3

There's actually a standard for RAID on-disk data and metadata, and it's called DDF (Disk Data Format). At this point most storage controllers are using it, though you should double check before you rely on it. Linux also has a mdraid (software RAID) mode which can read and write to DDF formatted arrays. DDF does indeed specify that the data on each disk is ...


2

Download the Smart Storage Administrator utility for Windows. Here's the link to the current product: https://support.hpe.com/hpsc/swd/public/detail?swItemId=MTX_891c6d6803044e5db3e0c2a5ab


2

This is your current disk layout. +-----+ +-------+ +------------------------+ | | | | | | +-----------+--------------+-----------------------------+ | nvme0n1p1 | nvme0n1p2 | nvme0n1p3 | <- Disk0 nvme0n1 +-----------+--------------+-----------------------------+ | | | ...


1

Honestly speaking using RAID for HDFS is not at all recommended. there is an thread on cloudera community portal - https://community.cloudera.com/t5/Support-Questions/Should-we-use-RAID-with-Hadoop/td-p/201381 https://community.cloudera.com/t5/Support-Questions/Do-we-config-our-hadoop-right-JBOD-vs-RAID/td-p/187997 Regarding this point.


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