Category Archives: Sys Admin

Material related to systems administration.

John’s PHP Extension library

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Note to self: my PHP extension is here: jj5@tact:/home/jj5/repo/git/git.php.net/php-src/ext/pext

The .so file (shared object) is in modules/pext.so

I linked it in like this:

-------------------
Sun May 23 13:44:22
root@tact:/usr/lib/php/20170718
# ln -s /home/jj5/repo/git/git.php.net/php-src/ext/pext/modules/pext.so .
-------------------

Configured it like this:

-------------------
Sun May 23 13:44:47
root@tact:/usr/lib/php/20170718
# cat /etc/php/7.2/cli/conf.d/pext.ini

extension=pext.so

-------------------

And I can build it like this:

-------------------
Sun May 23 13:51:37
jj5@tact:/home/jj5/repo/git/git.php.net/php-src/ext/pext
$ make clean && make

Replace a disk in a ZFS pool

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So smartd is suddenly emailing me about problems with one of the disks in my ZFS zpool. I have ordered a replacement disk and am waiting for it to arrive. While the smartd email says there is a problem `zpool status` says everything is fine. So I’m running a `zpool scrub` to see if ZFS can pick up on the disk errors.

Preparing for the disk replacement I searched the web and found Replace a disk in a ZFS pool.

I found the serial number of the faulty disk with `lsblk -I 8 -d -o NAME,SIZE,SERIAL`. The process is then:

  1. Shutdown the server
  2. Replace the faulty disk
  3. Boot the server
  4. Run zpool replace: sudo zpool replace data sdc
  5. Check zpool status: sudo zpool status data

I hope it turns out to be that easy! Now I just wait for my scrub to complete and my disk to arrive.

Update

Click through on the link below for some excellent documentation about how to handle this error:

Every 2.0s: zpool status                                              love: Fri Apr 30 07:52:40 2021

  pool: data
 state: ONLINE
status: One or more devices has experienced an unrecoverable error.  An
        attempt was made to correct the error.  Applications are unaffected.
action: Determine if the device needs to be replaced, and clear the errors
        using 'zpool clear' or replace the device with 'zpool replace'.
   see: http://zfsonlinux.org/msg/ZFS-8000-9P
  scan: scrub in progress since Thu Apr 29 02:30:54 2021
        4.32T scanned out of 5.03T at 42.9M/s, 4h48m to go
        466K repaired, 85.93% done
config:

        NAME         STATE     READ WRITE CKSUM
        data         ONLINE       0     0     0
          mirror-0   ONLINE       0     0     0
            sda      ONLINE       0     0     0
            sdb      ONLINE       0     0     0
          mirror-1   ONLINE       0     0     0
            sdc      ONLINE       0     0     4  (repairing)
            sdd      ONLINE       0     0     0
        cache
          nvme0n1p4  ONLINE       0     0     0

errors: No known data errors