The Geek Fix

Fixes from a Geek

How to Replace a Hard Drive In a Raid 5 via Ubuntu

Unfortunately I started receiving errors saying that one of the drives in my raid 5 (google exact error message) was messed up.  It held up for quite a while and it was time for an upgrade anyways.  Here are the steps I used to replace a drive within in my raid.

Determine which drive is failing

1. Since I didn’t label the drives I have to check the serial numbers to determine which one is faulty.  So I first installed hdparm. (If you want to get some SMART statistics then I would look into smartmontools)

sudo apt-get install hdparm

2. Once hdparm is installed you can run the command below.  It will list out all the serial numbers for the drives that are currently installed in your system:

hdparm -i /dev/sd? | grep SerialNo

Model=WDC WD5000BEVT-22A0RT0, FwRev=01.01A01, SerialNo=WD-WX20AA92XXXX
  Model=WDC WD20EFRX-68AX9N0, FwRev=80.00A80, SerialNo=WD-WMC1T133XXXX
  Model=WDC WD20EFRX-68AX9N0, FwRev=80.00A80, SerialNo=WD-WMC30059XXXX
  Model=WDC WD80EMAZ-00WJTA0, FwRev=83.H0A83, SerialNo=2SG4XTVW

2. Write down the serial number of the drive that needs to be replaced

3. Verify that the raid drive matches the serial number by replacing the ? with the drive letter

hdparm -i /dev/sdb | grep SerialNo

Model=WDC WD20EFRX-68AX9N0, FwRev=80.00A80, SerialNo=WD-WMC1T1XXXXXX

4. List the drives in the raid:

 thegeekfix@nas:~$ cat /proc/mdstat
  Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
  md0 : active raid5 sdc1[2] sdb1[1] sdd1[3]
   3906763776 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/3] [UUU]

5. Once you have verified the serial number of the drive you can mark it as failed and then remove it from the raid with the following command:

mdadm --manage /dev/md0 --fail /dev/sde1
mdadm --manage /dev/md0 --remove /dev/sde1

Adding the new drive

  1. After replacing the hard drive you’ll want to double check that the system is able to read it.
    hdparm -i /dev/sdb | grep SerialNo
  2. Next, you’ll want to partition it.
    parted -a optimal /dev/sde 
  3. Finally, add it to the raid.
    mdadm --manage /dev/md0 --add /dev/sde1
  4. Depending on how much data you have it can take a couple of hours.  You can view the progress by using the following command:
    cat /proc/mdstat
  5. If you are replacing all the drives then you will have to partition and add each one to the raid one at a time.

Growing your raid

In my instance I decided to just replace all of the hard drives with larger ones (2tb -> 8tb) as I was running out of space anyways.  After replacing, partitioning, and adding each drive one by one it was time to expand the raid.  Here is how I did it:

  1. I came across some information noting that it is strongly recommended to remove the bitmap prior to expanding so I executed the following commands.  Also note that this process can take a couple of hours depending on how large your raid will be:
    mdadm --grow /dev/mdX --bitmap none
    mdadm --grow /dev/mdX --size=max
    mdadm --wait /dev/mdX
    mdadm --grow /dev/mdX --bitmap internal
  2. Once that completes you should be able to see your expanded raid by simply typing the following command.


The Best 60% Mechanical Keyboards Under $100

I have used quite a few mechanical keyboards and always have enjoyed using 60% boards.   Nowadays there are so many options on the market which make making a decision tough.  So I have compiled a list of 60% mechanical keyboards which I hope you find helpful.

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Windows 10 Safe Mode Login Issues

windows 10 startup settings

I recently had been experiencing some issues with my Windows 10 install and was attempting to log in through Safe Mode, but kept encountering an issue where my password was incorrect.  The solution to this problem is quite simple. Continue reading

Nintendo Switch: Easily convert files from xci to nsp using 4nxci


If you are looking to load .nsp files to your Nintendo Switch but they are currently formatted as .xci there is an easy to use tool to accomplish this.  It’s called 4nxci and all it takes is a few clicks. Continue reading

How to Sideload APK’s to Oculus Quest on Mac


Are you wanting to sideload some APK’s on your Oculus Quest?  Read on for instructions for Mac.

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How to Play SteamVR on the Oculus Quest using ALVR


I came across an interesting post on Reddit earlier today saying that it was possible to play SteamVR with the Oculus Quest using an application called ALVR.  I decided to give it a try today and these are the steps to install ALVR.

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Which Oculus Quest storage option is right for you?


The Oculus Quest was officially released today, and while you may have decided to buy it you’re a little unsure which storage size to get.  After all there isn’t a microSD slot to increase the storage.  But, if you’re like me you’re probably debating whether or not is it really worth the $100 to get double the storage size?

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Must Have Free Games for New Oculus Rift Owners 2018


Congratulations on your Oculus Rift purchase.  Of course you want to dive into anything and everything VR has to offer.  Here are some great VR experiences and best of all they are free.

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HTC Vive vs Oculus Rift, which one should you buy?


As prices have come down quite a bit on VR headsets since initial release I thought I’d quickly do a comparison between both the HTC Vive and Oculus Rift.

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Lenovo Explorer Mixed Reality Headset and Controller Issues


How I fixed no video from the display and controllers not being picked up in Mixed Reality Portal. Continue reading

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