Reset BMC password

If you have one of iXsystems’ TrueNAS server whose motherboard was produced by SuperMicro, there’s a way to reset the BMC password with that CLI to use as root :

Disk Temperature

⚠️ Do not activate any aggressive power-management parameters on disks. This is the main reasons temperatures are not reported in graphs.

List all connected devices

nvd0 is the system’s NVMe SSD, ada0 a SATA HDD and da0 a USB external drive.

 1root@truenas[/mnt]# geom disk list
 2Geom name: nvd0
 3Providers:
 41. Name: nvd0
 5   Mediasize: 250059350016 (233G)
 6   Sectorsize: 512
 7   Mode: r1w1e2
 8   descr: WDC WDS250G2B0C
 9   rotationrate: 0
10   fwsectors: 0
11   fwheads: 0
12
13Geom name: ada0
14Providers:
151. Name: ada0
16   Mediasize: 6001175126016 (5.5T)
17   Sectorsize: 512
18   Stripesize: 4096
19   Stripeoffset: 0
20   Mode: r1w1e3
21   descr: TOSHIBA HDWN160
22   rotationrate: 7200
23   fwsectors: 63
24   fwheads: 16
25
26Geom name: da0
27Providers:
281. Name: da0
29   Mediasize: 320072933376 (298G)
30   Sectorsize: 512
31   Mode: r0w0e0
32   descr: ST332082 0ACE
33   rotationrate: unknown
34   fwsectors: 63
35   fwheads: 255

Mount an NTFS partition

1root@truenas[/mnt]# kldload fuse.ko
2root@truenas[/mnt]# mkdir usb-hdd
3root@truenas[/mnt]# ntfs-3g /dev/da0p2 /mnt/usb-hdd

Mount exFAT partition

 1root@truenas[/mnt]# gpart show ada4
 2=>        34  7814037101  ada4  GPT  (3.6T)
 3          34           6        - free -  (3.0K)
 4          40      409600     1  efi  (200M)
 5      409640        2008        - free -  (1.0M)
 6      411648  7813623808     2  ms-basic-data  (3.6T)
 7  7814035456        1679        - free -  (840K)
 8
 9root@truenas[/mnt]# mkdir hdd-4tb                                              
10
11root@truenas[/mnt]# kldload fusefs
12
13root@truenas[/mnt]# mount.exfat-fuse /dev/ada4p2 ./hdd-4tb                     

Delete a partition

 1root@truenas[/mnt]# gpart show da0
 2=>        34  7814037101  da0  GPT  (3.6T)
 3          34           6       - free -  (3.0K)
 4          40      409600    1  efi  (200M)
 5      409640  7813365344    2  apple-hfs  (3.6T)
 6  7813774984      262151       - free -  (128M)
 7
 8root@truenas[/mnt]# gpart delete -i 1 da0
 9da0p1 deleted
10
11root@truenas[/mnt]# gpart show da0
12=>        34  7814037101  da0  GPT  (3.6T)
13          34      409606       - free -  (200M)
14      409640  7813365344    2  apple-hfs  (3.6T)
15  7813774984      262151       - free -  (128M)

3-pass USB HDD wipe

 1root@truenas[/mnt]# bcwipe -v -me -t2 -b /dev/da0
 2Multithreading not supported.
 3Run ./configure with --enable-pthreads option, then rebuild BCWipe to enable multithreading.
 4Wiping scheme: US DoE, 3 pass(es)
 5Wipe /dev/da0 (y/[n]/a)?y
 6Wiping char device '/dev/da0'
 7Device '/dev/da0' opened in direct access mode
 8Device size 320072933376 bytes (312571224 kB), method 3
 9Wiping char device '/dev/da0' pass 1/3 [random] started
10wipe pass  1/3 :    212992/312571224 kB (  0%)   Rate: 21233 kB/s

ZFS

• List all snaphots of the tank/my-data dataset:

  1$ zfs list -r -t snapshot tank/my-data
  

• Rename all snapshot’s names prefixes from auto- to daily- , for the tank/my-data dataset and its children:

   1$ zfs list -r -t snapshot tank/my-data
   2NAME                                                       USED  AVAIL     REFER  MOUNTPOINT
   3tank/my-data@auto-2021-09-02_00-00                           0B      -      209G  -
   4tank/my-data@auto-2021-09-03_00-00                           0B      -      209G  -
   5tank/my-data@auto-2021-09-04_00-00                           0B      -      209G  -
   6(...)
   7$ zfs list -r -t snapshot -o name -H tank/my-data | awk '{$2 = $1; sub(/@auto\-/, "@daily-", $2); printf "%s\n%s\n", $1, $2;}' | tr '\n' '\0' | xargs -0 -n 2 -t zsh -c 'zfs rename "$0" "$1"'
   8zsh -c zfs rename "$0" "$1" tank/my-data@auto-2021-09-02_00-00 tank/my-data@daily-2021-09-02_00-00
   9zsh -c zfs rename "$0" "$1" tank/my-data@auto-2021-09-03_00-00 tank/my-data@daily-2021-09-03_00-00
  10zsh -c zfs rename "$0" "$1" tank/my-data@auto-2021-09-04_00-00 tank/my-data@daily-2021-09-04_00-00
  11(...)
  12$ zfs list -r -t snapshot tank/my-data
  13NAME                                                       USED  AVAIL     REFER  MOUNTPOINT
  14tank/my-data@daily-2021-09-02_00-00                          0B      -      209G  -
  15tank/my-data@daily-2021-09-03_00-00                          0B      -      209G  -
  16tank/my-data@daily-2021-09-04_00-00                          0B      -      209G  -
  17(...)
  

FreeNAS to TrueNAS migration

I wrote a long article on how to migrate an encrypted pool from FreeNAS to TrueNAS  .

Unreachable Network due to Multiple NICs

My machine was regularly disconnected from the network and couldn’t be cleanly rebooted. This started under FreeNAS 11.3-U4.1 and is still reproducible with a fresh TrueNAS 12.0 .

The issue lies somewhere in all connected interfaces being granted DHCP active service:

https://www.youtube.com/watch?v=vDMooVj-flM

The issue is being discussed on iXsystems’ JIRA  .

ValidateUpdate error on upgrade

Got the following error on upgrade?

PermissionError: [Errno 13] Permission denied: './ValidateUpdate'

The fix: temporary switch the System Dataset  to freenas-boot . Your default system dataset is probably set to your ZFS pool which might be unavailable for whatever reason. In my case, I was in the middle of a pool migration process  .