# Not enough free bitmap slots when setting up a 3 node DRBD **URL:** \ **Category:** DRBD\ **Tags:** drbd\ **Created:** [March 17, 2026, 10:49pm UTC](https://forums.linbit.com/t/not-enough-free-bitmap-slots-when-setting-up-a-3-node-drbd/1181 "2026-03-17T22:49:14Z")\ **Posts on this page:** 4\ **Page:** 1
**Author:** ![paulororke](https://avatars.discourse-cdn.com/v4/letter/p/d07c76/32.png) [@paulororke](https://forums.linbit.com/u/paulororke)\ **Post date:** [March 17, 2026, 10:49pm UTC](https://forums.linbit.com/t/not-enough-free-bitmap-slots-when-setting-up-a-3-node-drbd/1181/1 "2026-03-17T22:49:14Z")
I can’t figure out why I am getting a failure on bringing up my resource. It says there are not enough bitmap slots, but I have only 12 resources on there and I even added more slots. `:~$ sudo drbdadm up RT6` `15: Failure: (162) Invalid configuration request` `additional info from kernel:` `Not enough free bitmap slots (available=0, needed=1)` `Command ‘drbdsetup attach 15 /dev/vg0/RT6 /dev/vg0/RT6 internal’ terminated with exit code 10` `:~$ cat /sys/module/drbd/parameters/minor_count` `128` 128 seems excessive… I was trying to add a third node. All my 2 note sets are fine. `resource RT6 {` `device /dev/drbd15;` `disk /dev/vg0/RT6;` `meta-disk internal;` `on trk-kvm-01 {` `node-id 0;` `}` `on trk-kvm-02 {` `node-id 1;` `}` `on trk-kvm-04 {` `node-id 2;` `}` `connection {` `host trk-kvm-01 address 10.10.1.145:7115;` `host trk-kvm-02 address 10.10.1.146:7116;` `}` `connection {` `host trk-kvm-01 address 10.10.3.15:7315;` `host trk-kvm-04 address 10.10.3.17:7357;` `}` `connection {` `host trk-kvm-02 address 10.10.2.16:7256;` `host trk-kvm-04 address 10.10.2.187:7257;` `}` `}` Is my config wrong? Why might I be getting that error? I saw this about not reading bitmaps > [@DRBD kickstart troubleshooting](https://forums.linbit.com/t/drbd-kickstart-troubleshooting/107/4): > > What you are seeing here may be related to a recent regression that has now been fixed in the most recent release candidates for 9.1.21 and 9.2.10. > > > - Fix an out-of-bounds access when scanning the bitmap. It leads to a > > crash when the bitmap ends on a page boundary, and this is also a > > regression in 9.1.20. and did update to 9.3.1/9.34.8-0: `:~$ sudo drbdadm --version` `DRBDADM_BUILDTAG=GIT-hash:\ 696ee0fafa437f3b33b1e437cfc2741bf93604b2\ build\ by\ buildd@lcy02-amd64-073,\ 2026-03-10\ 12:39:25` `DRBDADM_API_VERSION=2` `DRBD_KERNEL_VERSION_CODE=0x090301` `DRBD_KERNEL_VERSION=9.3.1` `DRBDADM_VERSION_CODE=0x092200` `DRBDADM_VERSION=9.34.0-rc.1` But I am not sure it is related. It would seem to me the message is a bit of a red herring, that there should be slots available. What am I missing? ---
**Author:** ![paulororke](https://avatars.discourse-cdn.com/v4/letter/p/d07c76/32.png) [@paulororke](https://forums.linbit.com/u/paulororke)\ **Post date:** [March 18, 2026, 7:46pm UTC](https://forums.linbit.com/t/not-enough-free-bitmap-slots-when-setting-up-a-3-node-drbd/1181/2 "2026-03-18T19:46:27Z")
I find that even if I try this now using two nodes only ```auto resource RT6 { device /dev/drbd15; disk /dev/vg0/RT6; meta-disk internal; on trk-kvm-01 { node-id 0; } #on trk-kvm-02 { #node-id 1; #} on trk-kvm-04 { node-id 2; } #connection { #host trk-kvm-01 address 10.10.1.145:7115; #host trk-kvm-02 address 10.10.1.146:7116; #} connection { host trk-kvm-01 address 10.10.3.15:7315; host trk-kvm-04 address 10.10.3.17:7357; } #connection { #host trk-kvm-02 address 10.10.2.16:7256; #host trk-kvm-04 address 10.10.2.187:7257; #} } ``` I still get the message: ```auto 4:~$ sudo drbdadm up RT6 15: Failure: (162) Invalid configuration request additional info from kernel: Not enough free bitmap slots (available=0, needed=1) Command ‘drbdsetup attach 15 /dev/vg0/RT6 /dev/vg0/RT6 internal’ terminated with exit code 10 ``` I am at a loss to understand/explain this. It can’t be a simple resource count, I have only a few. I have run many more before. ---
**Author:** ![Devin](https://yyz1.discourse-cdn.com/flex003/user_avatar/forums.linbit.com/devin/32/26_2.png) [@Devin](https://forums.linbit.com/u/Devin)\ **Post date:** [March 20, 2026, 6:07pm UTC](https://forums.linbit.com/t/not-enough-free-bitmap-slots-when-setting-up-a-3-node-drbd/1181/3 "2026-03-20T18:07:45Z")
Best guess is that there was something weird which happened during the initial meta-data creation. Was this perhaps originally created as a one node setup? The `create-md` command should parse the configuration and create the needed amount of bitmap slots in the DRBD meta-data. If you want to specify the number of meta-data slots manually you could also do that via the `--max-peers=` option. At this point I would advise you readjust the configuration for the three nodes you need and then re-run the `drbdadm create-md RT6` command on all nodes and try again. ---
**Author:** ![paulororke](https://avatars.discourse-cdn.com/v4/letter/p/d07c76/32.png) [@paulororke](https://forums.linbit.com/u/paulororke)\ **Post date:** [March 20, 2026, 8:30pm UTC](https://forums.linbit.com/t/not-enough-free-bitmap-slots-when-setting-up-a-3-node-drbd/1181/4 "2026-03-20T20:30:24Z")
That is a thing of beauty. > [@Devin](#): > > Was this perhaps originally created as a one node setup? I was originally a 3 node, I made it two node for a while and was returning it to 3 node so it never occurred to me to recreate the metadata. In hindsight, now you bring it to my attention I may have recreated the metadata as two node at some point, it is quite possible. Anyway, I am syncing now and I know now what to do should I encounter this again. This is VERY much appreciated.