Can I detach and remove L2ARC drive?

[silvergoat]

I read a little more about L2ARC and it's almost useless for my media server. Can I just detach it through the GUI and then shut down the server, remove and restart?

Will this affect my 4096k sector setting?

It seems a better choice to have the SSD gathering dust then being plugged in doing nothing.

 

[compudaze]

I would like to know as well.

 

[paleoN]

Can I just detach it through the GUI and then shut down the server, remove and restart?

Not sure, but you can do it from the CLI if not.

Will this affect my 4096k sector setting?

How could it?

It seems a better choice to have the SSD gathering dust then being plugged in doing nothing.

But SSD's make everything better. ;) Did you enable prefetch for the L2ARC? Then it might start using it, but you're still likely better off finding another use for it.

 

[cyberjock]

I read a little more about L2ARC and it's almost useless for my media server.

It's true. It really doesn't help much in most cases.

 

[emk2203]

I read a little more about L2ARC and it's almost useless for my media server.

What a coincidence. I was just thinking of adding a L2ARC to my system (USB3 pen drive, though). Could you elaborate a little about why you think that it's useless? Or in which case would it make sense?

 

[rm-r]

This post seems unanswered.... but i too am now thinking about removing the l2arc SSD after reading cyberjocks powerpoint.... http://forums.freenas.org/threads/slideshow-explaining-vdev-zpool-zil-and-l2arc-for-noobs.7775/

can anyone classify the process to do this? will the vdev then be "degraded" as far as freenas is concerned?

 

[rm-r]

if you have an l2arc running - check this out for stats = http://doc.freenas.org/index.php/Arcstat

 

[ssgoku129]

Ahhh so there just isn't an answer for this?

 

[eraser]

Ahhh so there just isn't an answer for this?

This seemed to work for me:

Code:

[root@bfd] /mnt/tank# zpool status
  pool: tank
state: ONLINE
  scan: scrub repaired 0 in 5h26m with 0 errors on Sun Jul 13 05:26:20 2014
config:

        NAME                                            STATE     READ WRITE CKSUM
        tank                                            ONLINE       0     0     0
          mirror-0                                      ONLINE       0     0     0
            gptid/ad06cfc6-710e-11e3-93a2-001b785dc648  ONLINE       0     0     0
            gptid/af04a5d0-710e-11e3-93a2-001b785dc648  ONLINE       0     0     0
          mirror-1                                      ONLINE       0     0     0
            gptid/b1484593-710e-11e3-93a2-001b785dc648  ONLINE       0     0     0
            gptid/ed1e23bc-937f-11e3-b53f-001b785dc648  ONLINE       0     0     0
        cache
          gptid/1d31c7c8-d552-11e3-afbf-001b785dc648    ONLINE       0     0     0

errors: No known data errors
[root@bfd] /mnt/tank# zpool remove tank gptid/1d31c7c8-d552-11e3-afbf-001b785dc648
[root@bfd] /mnt/tank# zpool status
  pool: tank
state: ONLINE
  scan: scrub repaired 0 in 5h26m with 0 errors on Sun Jul 13 05:26:20 2014
config:

        NAME                                            STATE     READ WRITE CKSUM
        tank                                            ONLINE       0     0     0
          mirror-0                                      ONLINE       0     0     0
            gptid/ad06cfc6-710e-11e3-93a2-001b785dc648  ONLINE       0     0     0
            gptid/af04a5d0-710e-11e3-93a2-001b785dc648  ONLINE       0     0     0
          mirror-1                                      ONLINE       0     0     0
            gptid/b1484593-710e-11e3-93a2-001b785dc648  ONLINE       0     0     0
            gptid/ed1e23bc-937f-11e3-b53f-001b785dc648  ONLINE       0     0     0

errors: No known data errors
[root@bfd] /mnt/tank#

 

[Rick Arman]

i did the same thing and it mentioned something in the critical alerts about running in degraded state although the disks view and the zpool in the shell seems to show online and healthy. any cause for concern?

 

[cyberjock]

i did the same thing and it mentioned something in the critical alerts about running in degraded state although the disks view and the zpool in the shell seems to show online and healthy. any cause for concern?

We'd need a lot more specific information to make a statement about your question.

 

[Ericloewe]

Necro'd not once, but twice. That's a new one. Locking this thread and moving the recent question elsewhere.