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    NAS alternative on the cheap

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    centos raid
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    • M
      matteo nunziati @Emad R
      last edited by

      @emad-r said in NAS alternative on the cheap:

      I removed 1 HDD from my test environment and it was very easy to detect and handle.

      how did you remote it? usually with soft raid you would not eject a drive without purging it from RAID before...

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        Emad R @matteo nunziati
        last edited by

        @matteo-nunziati said in NAS alternative on the cheap:

        @emad-r said in NAS alternative on the cheap:

        I removed 1 HDD from my test environment and it was very easy to detect and handle.

        how did you remote it? usually with soft raid you would not eject a drive without purging it from RAID before...

        in virtual environment you can do whatever you want.

        M 1 Reply Last reply Reply Quote 0
        • M
          matteo nunziati @Emad R
          last edited by

          @emad-r said in NAS alternative on the cheap:

          @matteo-nunziati said in NAS alternative on the cheap:

          @emad-r said in NAS alternative on the cheap:

          I removed 1 HDD from my test environment and it was very easy to detect and handle.

          how did you remote it? usually with soft raid you would not eject a drive without purging it from RAID before...

          in virtual environment you can do whatever you want.

          ah! sorry I've misunderstood: I was sure you had remove a disk from a physical OBR10!

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          • E
            Emad R @Emad R
            last edited by Emad R

            @emad-r

            So I deleted the contents of boot partition + boot EFI in Fedora, trying to simulate failure of the boot partitions like I did in Centos, and I restarted Fedora and the system worked ! (cause boot partitions are not inside RAID, and if you read the edit it works only cause it auto-detects the copies I made of the boot partitions)

            ANyway I found the best approach which OBR10 and I dont let take the max size at the drives i spare 8 GB and then I copy the boot partitions to the end of the empty space of those drives if I ever needed them as backup.

            Edit = I deleted the boot paritions but it seems Fedora is smart enough that i already copied the boot drives so it automatically used them. without me pasting it back.

            pics

            0_1518519471706_2018-02-13 12_49_38-Fedora Server [Running] - Oracle VM VirtualBox.png

            0_1518519476156_2018-02-13 12_51_11-Fedora Server [Running] - Oracle VM VirtualBox.png

            0_1518519481491_2018-02-13 12_51_50-Fedora Server [Running] - Oracle VM VirtualBox.png

            Note that it detected the boot partition without the boot flag.

            Okay next step

            I restored the flags + boot partitions on the original drive, then rebooted = still boots from drive /dev/sdf3+2

            So I deleted /dev/sdf3+2 and now it is using /dev/sdg3+2 (another copy, yes I copied the boot parition on the end of each RAID drive)

            This is surprising interesting for me, I never new about this feature of auto recovery of boot paritions and detection even if they are not in the beginning of the drive, the system is using them at the end of the drive.

            I wonder if Centos is the same ...

            Last test was to delete all the other at the end of drive boot partition and keep the ones I restored at the original location of first drive and system booted fine to those, so all is good and again surprised on how much the system is resilient.

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            • S
              scottalanmiller @Emad R
              last edited by

              @emad-r said in NAS alternative on the cheap:

              @emad-r said in NAS alternative on the cheap:

              @scottalanmiller @travisdh1

              @scottalanmiller @travisdh1

              Should I worry about the fact that the boot partition is not included in the RAID array ? what can you advise to fix or increase the durability of this, without dedicated RAID card

              Also the setup is very nice especially with cockpit.

              It can't be, you have to manually copy the /boot to each partition.

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                Emad R @Emad R
                last edited by

                @emad-r

                Centos not the same behaviour. it does not switch to another boot partition and auto detects it if there, it just errors out on next reboot. and you cant just restore the partition either to restore the system...

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                  Emad R @scottalanmiller
                  last edited by

                  @scottalanmiller said in NAS alternative on the cheap:

                  @emad-r said in NAS alternative on the cheap:

                  @emad-r said in NAS alternative on the cheap:

                  @scottalanmiller @travisdh1

                  @scottalanmiller @travisdh1

                  Should I worry about the fact that the boot partition is not included in the RAID array ? what can you advise to fix or increase the durability of this, without dedicated RAID card

                  Also the setup is very nice especially with cockpit.

                  It can't be, you have to manually copy the /boot to each partition.

                  try it out, have fedora system install, and copy the boot paritions to another disk, then delete the original boot partition and reboot the system, the system will auto detect and boot from the duplicated in another disk boot parition, on centos this does not happen. I tested with in EFI

                  E 1 Reply Last reply Reply Quote 1
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                    Emad R @Emad R
                    last edited by Emad R

                    @emad-r said in NAS alternative on the cheap:

                    @scottalanmiller said in NAS alternative on the cheap:

                    @emad-r said in NAS alternative on the cheap:

                    @emad-r said in NAS alternative on the cheap:

                    @scottalanmiller @travisdh1

                    @scottalanmiller @travisdh1

                    Should I worry about the fact that the boot partition is not included in the RAID array ? what can you advise to fix or increase the durability of this, without dedicated RAID card

                    Also the setup is very nice especially with cockpit.

                    It can't be, you have to manually copy the /boot to each partition.

                    try it out, have fedora system install, and copy the boot paritions to another disk, then delete the original boot partition and reboot the system, the system will auto detect and boot from the duplicated in another disk boot parition, on centos this does not happen. I tested with in EFI

                    I suspect this behavior is related to that centos uses XFS for boot partition and Fedora uses EXT4 so doing more tests, and perhaps UUID is another possible reason.

                    E 1 Reply Last reply Reply Quote 1
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                      Emad R @Emad R
                      last edited by Emad R

                      @emad-r said in NAS alternative on the cheap:

                      @emad-r said in NAS alternative on the cheap:

                      @scottalanmiller said in NAS alternative on the cheap:

                      @emad-r said in NAS alternative on the cheap:

                      @emad-r said in NAS alternative on the cheap:

                      @scottalanmiller @travisdh1

                      @scottalanmiller @travisdh1

                      Should I worry about the fact that the boot partition is not included in the RAID array ? what can you advise to fix or increase the durability of this, without dedicated RAID card

                      Also the setup is very nice especially with cockpit.

                      It can't be, you have to manually copy the /boot to each partition.

                      try it out, have fedora system install, and copy the boot paritions to another disk, then delete the original boot partition and reboot the system, the system will auto detect and boot from the duplicated in another disk boot parition, on centos this does not happen. I tested with in EFI

                      I suspect this behavior is related to that centos uses XFS for boot partition and Fedora uses EXT4 so doing more tests, and perhaps UUID is another possible reason.

                      I am dropping this, I matched UUID and flags and everything, if you delete boot + boot/efi on Centos no matter what it does not get restored, even if you cloned the parition back and restored same UUID + flags.

                      EXT4 seems better for boot cause it retains the UUID while copying while XFS changes it.

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                      • S
                        scottalanmiller
                        last edited by

                        Oh interesting. Good catch.

                        E 1 Reply Last reply Reply Quote 1
                        • E
                          Emad R @scottalanmiller
                          last edited by Emad R

                          @scottalanmiller

                          Yh by accident today I was able to understand it better

                          2_1518718280839_2018-02-15 20_02_46-Fedora OBR10 - VMware Workstation.png 1_1518718280837_2018-02-15 20_02_41-Fedora OBR10 - VMware Workstation.png 0_1518718280836_2018-02-15 20_08_13-Fedora OBR10 - VMware Workstation.png

                          Fedora suffers the same fate as centos, and wants to error out but instead when it does not see the boot partitions it will error out quickly then check the next drive, and if it founds it it will update the EFI parition and add another line so it has fail safe method, centos wont do this. so the 1st entry belonged to boot part that was deleted and the 2nd as well, so fedora will keep finding them if you have them and it will auto update the EFI parition while it boots up and adds another line, so then you can boot normally. all this done in the background, you will just see an error fail for boot for 1-2 seconds they you will boot normally cause Fedora already written another entry.

                          I am starting to like Fedora for servers (minimal install) and if I want centos I can use it as guest vm.

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