XOSTOR hyperconvergence preview

olivierlambert

The problem will be about to compute the available space if you have different replication number.

But in any cases, contributions are always welcome, we'll discuss details in PR.

geoffbland

I am trying this on pool with 5 hosts. Each host has a 4TB HDD installed that I am using for this.

Following the instructions here I download the installer and run it with ./install --disks /dev/sda --force - this runs through and no errors are shown but right at the end it displays:

 Volume group "linstor_group" not found
  Cannot process volume group linstor_group
  Physical volume "/dev/sda" successfully created.
  Volume group "linstor_group" successfully created

But then checking the disk I don't see the expected partitions:

[09:12 XCPNG01 ~]# lsblk
...
sda                               8:0    0   3.7T  0 disk
<nothing here>
...

Versions

[09:34 XCPNG01 ~]# uname -a
Linux XCPNG01 4.19.0+1 #1 SMP Thu Jan 13 12:55:45 CET 2022 x86_64 x86_64 x86_64 GNU/Linux

[09:28 XCPNG01 ~]# rpm -qa | grep -E "^(sm|xha)-.*linstor.*"
sm-2.30.6-1.1.0.linstor.1.xcpng8.2.x86_64
xha-10.1.0-2.2.0.linstor.1.xcpng8.2.x86_64

I should mention that this disk was previously mounted as an SR but is no longer, and also was part of a glusterfs store but is no longer.

If I run ./install --disks /dev/sda --force a second time it obviously has not much to do as it has installed everything but now I get a slightly different error:

Package python-linstor-1.12.0-1.noarch already installed and latest version
Nothing to do
  VG            #PV #LV #SN Attr   VSize  VFree
  linstor_group   1   0   0 wz--n- <3.64t <3.64t
  Volume group "linstor_group" successfully removed
  Volume group "sda" not found
  Cannot process volume group sda
Failed to execute vgremove properly.

What should I do to work out what the problem is?

geoffbland

Just reading through the install script, if thin provisioning is not used (i.e thick provisioning is) then the volume group linstor_group will get created but no logical volume is created:

    if subprocess.call(['vgcreate', LINSTOR_GROUP] + disks):
        print('Failed to execute vgcreate properly.')
        return os.EX_SOFTWARE

    if thin and subprocess.call(['lvcreate', '-l', '100%FREE', '-T', '{}/thin_device'.format(LINSTOR_GROUP)]):
        print('Failed to create thin device properly.')
        return os.EX_SOFTWARE

So are the installation instructions incorrect? Step 3 where it states to check the config before proceeding it states to use lsblk to check that the LVM logical volumes are created - but it looks to me like this does not occur unless thin provisioning is used?

I can see that the volume group has been created as you would expect by looking at the install script.


[08:41 XCPNG01 ~]# pvscan
  ...
  PV /dev/sda         VG linstor_group                                        lvm2 [<3.64 TiB / <3.64 TiB free]
  ...


[08:35 XCPNG01 ~]# vgdisplay
  ...
  --- Volume group ---
  VG Name               linstor_group
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  1
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                0
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               <3.64 TiB
  PE Size               4.00 MiB
  Total PE              953861
  Alloc PE / Size       0 / 0
  Free  PE / Size       953861 / <3.64 TiB
  VG UUID               uidJ13-juc7-2cm0-NnkV-wdhA-4fNm-HAWrgh

Am I misunderstanding the instructions somehow or missing something?

olivierlambert

Pinging @ronan-a

ronan-a

@geoffbland Without thin option, no LVM volume is created. It's expected. You must just have a VG :

# vgs
  VG                                                 #PV #LV #SN Attr   VSize   VFree  
  VG_XenStorage-11daa412-d2b5-cb7c-e8ae-847821e367a6   1   1   0 wz--n- 144.23g 144.23g
  linstor_group

A LVM volume is only required for the thin driver of LINSTOR.
I updated the main post, it was not totally clear.

Regarding the force option, I fixed it here: https://gist.githubusercontent.com/Wescoeur/7bb568c0e09e796710b0ea966882fcac/raw/6aacde6b5c55f8e7b70ed585c59b9c2d54a2ea69/gistfile1.txt

It must be:

subprocess.call(['vgremove', '-f', LINSTOR_GROUP, '-y'])

instead of:

subprocess.call(['vgremove', '-f', LINSTOR_GROUP, '-y'] + disks)

geoffbland

@ronan-a said in XOSTOR hyperconvergence preview:

I updated the main post, it was not totally clear.

Thanks for that. I expected this was the case but wanted to be sure.
Looks like this is working so far then I will continue with my installation & testing.

geoffbland

XOSTOR is now successfully installed on all 5 of my nodes in the cluster.

I ran this command (I'm assuming that this only needs running on one host?).

xe sr-create type=linstor name-label=XOSTOR01 host-uuid=28af0626-7788-4104-9449-xxxxxxxxxxxx device-config:hosts=XCPNG01,XCPNG02,XCPNG03,XCPNG04,XCPNG05 device-config:group-name=linstor_group device-config:redundancy=3 shared=true device-config:provisioning=thick

And this returned the SR UUID cf896912-cd71-d2b2-488a-xxxxxxxxxxxx this looks like it worked as expected.

Running linstor node list shows the following:

[12:01 XCPNG01 ~]# linstor node list
╭─────────────────────────────────────────────────────────╮
┊ Node    ┊ NodeType ┊ Addresses                 ┊ State  ┊
╞═════════════════════════════════════════════════════════╡
┊ XCPNG01 ┊ COMBINED ┊ 192.168.1.41:3366 (PLAIN) ┊ Online ┊
┊ XCPNG02 ┊ COMBINED ┊ 192.168.1.42:3366 (PLAIN) ┊ Online ┊
┊ XCPNG03 ┊ COMBINED ┊ 192.168.1.43:3366 (PLAIN) ┊ Online ┊
┊ XCPNG04 ┊ COMBINED ┊ 192.168.1.44:3366 (PLAIN) ┊ Online ┊
┊ XCPNG05 ┊ COMBINED ┊ 192.168.1.45:3366 (PLAIN) ┊ Online ┊
╰─────────────────────────────────────────────────────────╯

[12:05 XCPNG01 ~]# linstor volume list
╭────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
┊ Node    ┊ Resource                ┊ StoragePool          ┊ VolNr ┊ MinorNr ┊ DeviceName    ┊ Allocated ┊ InUse  ┊    State ┊
╞════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════════╡
┊ XCPNG01 ┊ xcp-persistent-database ┊ DfltDisklessStorPool ┊     0 ┊    1000 ┊ /dev/drbd1000 ┊           ┊ InUse  ┊ Diskless ┊
┊ XCPNG02 ┊ xcp-persistent-database ┊ DfltDisklessStorPool ┊     0 ┊    1000 ┊ /dev/drbd1000 ┊           ┊ Unused ┊ Diskless ┊
┊ XCPNG03 ┊ xcp-persistent-database ┊ xcp-sr-linstor_group ┊     0 ┊    1000 ┊ /dev/drbd1000 ┊  1.00 GiB ┊ Unused ┊ UpToDate ┊
┊ XCPNG04 ┊ xcp-persistent-database ┊ xcp-sr-linstor_group ┊     0 ┊    1000 ┊ /dev/drbd1000 ┊  1.00 GiB ┊ Unused ┊ UpToDate ┊
┊ XCPNG05 ┊ xcp-persistent-database ┊ xcp-sr-linstor_group ┊     0 ┊    1000 ┊ /dev/drbd1000 ┊  1.00 GiB ┊ Unused ┊ UpToDate ┊
╰────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯

Strangely running linstor node list only works on node XCPNO01, on the other 4 nodes I get the error Error: Unable to connect to linstor://localhost:3370: [Errno 99] Cannot assign requested address. Is this expected?

However when I check on XO (from sources) it shows one of the hosts is disconnected.

XOSTOR01 Storage.png

When I try to connect it from XO I get this error, is this related to the problem with linstor commands only working on one host XCPNG01?

pbd.connect
{
  "id": "8040176c-16da-674d-e9bd-708c3a66e68a"
}
{
  "code": "SR_BACKEND_FAILURE_47",
  "params": [
    "",
    "The SR is not available [opterr=Error: Unable to connect to any of the given controller hosts: ['linstor://XCPNG01']]",
    ""
  ],
  "task": {
    "uuid": "c92909b2-8a4e-e071-3c91-0c89a32b1e01",
    "name_label": "Async.PBD.plug",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20220516T11:12:41Z",
    "finished": "20220516T11:13:11Z",
    "status": "failure",
    "resident_on": "OpaqueRef:a1e9a8f3-0a79-4824-b29f-d81b3246d190",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "SR_BACKEND_FAILURE_47",
      "",
      "The SR is not available [opterr=Error: Unable to connect to any of the given controller hosts: ['linstor://XCPNG01']]",
      ""
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename lib/backtrace.ml)(line 210))((process xapi)(filename ocaml/xapi/storage_access.ml)(line 32))((process xapi)(filename ocaml/xapi/xapi_pbd.ml)(line 182))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 128))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/xapi/rbac.ml)(line 231))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 103)))"
  },
  "message": "SR_BACKEND_FAILURE_47(, The SR is not available [opterr=Error: Unable to connect to any of the given controller hosts: ['linstor://XCPNG01']], )",
  "name": "XapiError",
  "stack": "XapiError: SR_BACKEND_FAILURE_47(, The SR is not available [opterr=Error: Unable to connect to any of the given controller hosts: ['linstor://XCPNG01']], )
    at Function.wrap (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/_XapiError.js:16:12)
    at _default (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/_getTaskResult.js:11:29)
    at Xapi._addRecordToCache (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/index.js:949:24)
    at forEach (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/index.js:983:14)
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/index.js:973:12)
    at Xapi._watchEvents (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/index.js:1139:14)"
}

XCPNG02 is the XCPNG pool master and also the host that I ran the xe sr-create command on to create the SR.

What do I need to look at now to resolve this?

ronan-a

@geoffbland Well it's a known error resolved in this commit: https://github.com/xcp-ng/sm/commit/df92fcf7193f7f87fd03423293589fb50faa246d

You can modify /opt/xensource/sm/linstorvolumemanager.py with this fix on each node, it should repair the PBD connection.

FYI, we planned to release a new beta with all our fixes before the end of this month.

0

Wescoeur committed to xcp-ng/sm

fix(LinstorVolumeManager): ensure we always use IPs in _get_controller_uri

Otherwise if a hostname is returned, we can't use it if the XCP-ng pool
is configurer using static IPs instead of DHCP.

Signed-off-by: Ronan Abhamon <ronan.abhamon@vates.fr>

geoffbland

@ronan-a Thanks that fixed it and all hosts now have the SR connected.

Running linstor node list only works on node XCPNO01, on the other 4 nodes I get the error Error: Unable to connect to linstor://localhost:3370: [Errno 99] Cannot assign requested address still. Is this expected?

ronan-a

@geoffbland Yeah, you can only have one running controller in your pool, so you can use the command like this to use the controller remotely:

linstor --controllers=<node_ips> ...

Where node_ips is a comma-separated list.

geoffbland

@ronan-a you can only have one running controller in your pool

OK, got it, that makes sense. I think it is time I started reading up on Linstor rather than bugging you with what are probably easy questions to answer if I just read up a bit more. Thanks.

geoffbland

This post is deleted!

geoffbland

What is the URL for the GitHub repo for XOSTOR in case I find some issues and need to report them? I looked under the xcpng project - only sm (Stroage Manager) seemed relevant.

ronan-a

@geoffbland Yes, https://github.com/xcp-ng/sm is the right repository.

geoffbland

@ronan-a Thanks.
There's no Issues tab on this repo so no way to open issues on this repo. Are Issues turned on for this?

ronan-a

@geoffbland The entry for issues is this repo: https://github.com/xcp-ng/xcp
The sm repo is used for the pull requests.

geoffbland

First tests with XOSAN with newly created VMs have been good.

I'm now trying to migrate some existing VMs from NFS (TrueNAS) to XOSAN to test "active" VMs.

With the VM running - pressing the Migrate VDI button on the Disks tab, pauses the VM as expected but when the VM restarts the VDI is still on the original disk. The VDI has not been migrated to XOSAN.

If I first stop the VM and then press the Migrate VDI button on the Disks tab, I then do get an error.

vdi.migrate
{
  "id": "8a3520ad-328f-4515-b547-2fb283edbd91",
  "sr_id": "cf896912-cd71-d2b2-488a-5792b7147c87"
}
{
  "code": "SR_BACKEND_FAILURE_46",
  "params": [
    "",
    "The VDI is not available [opterr=Could not load f1ca0b16-ce23-408a-b80e-xxxxxxxxxxxx because: No such file or directory]",
    ""
  ],
  "task": {
    "uuid": "8b3b47ee-4135-fea7-5f30-xxxxxxxxxxxx",
    "name_label": "Async.VDI.pool_migrate",
    "name_description": "",
    "allowed_operations": [],
    "current_operations": {},
    "created": "20220522T12:20:12Z",
    "finished": "20220522T12:20:54Z",
    "status": "failure",
    "resident_on": "OpaqueRef:a1e9a8f3-0a79-4824-b29f-d81b3246d190",
    "progress": 1,
    "type": "<none/>",
    "result": "",
    "error_info": [
      "SR_BACKEND_FAILURE_46",
      "",
      "The VDI is not available [opterr=Could not load f1ca0b16-ce23-408a-b80e-xxxxxxxxxxxx because: No such file or directory]",
      ""
    ],
    "other_config": {},
    "subtask_of": "OpaqueRef:NULL",
    "subtasks": [],
    "backtrace": "(((process xapi)(filename ocaml/xapi-client/client.ml)(line 7))((process xapi)(filename ocaml/xapi-client/client.ml)(line 19))((process xapi)(filename ocaml/xapi-client/client.ml)(line 12325))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process xapi)(filename ocaml/xapi/message_forwarding.ml)(line 131))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 35))((process xapi)(filename lib/xapi-stdext-pervasives/pervasiveext.ml)(line 24))((process xapi)(filename ocaml/xapi/rbac.ml)(line 231))((process xapi)(filename ocaml/xapi/server_helpers.ml)(line 103)))"
  },
  "message": "SR_BACKEND_FAILURE_46(, The VDI is not available [opterr=Could not load f1ca0b16-ce23-408a-b80e-xxxxxxxxxxxx because: No such file or directory], )",
  "name": "XapiError",
  "stack": "XapiError: SR_BACKEND_FAILURE_46(, The VDI is not available [opterr=Could not load f1ca0b16-ce23-408a-b80e-xxxxxxxxxxxx because: No such file or directory], )
    at Function.wrap (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/_XapiError.js:16:12)
    at _default (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/_getTaskResult.js:11:29)
    at Xapi._addRecordToCache (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/index.js:949:24)
    at forEach (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/index.js:983:14)
    at Array.forEach (<anonymous>)
    at Xapi._processEvents (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/index.js:973:12)
    at Xapi._watchEvents (/opt/xo/xo-builds/xen-orchestra-202204291839/packages/xen-api/src/index.js:1139:14)"
}

Exporting the VDI from NFS and (re)importing as a VM on XOSTOR does work.

I'm guessing this is not a problem with XOSTOR specifically but with XO or NFS, still I would like to work out what is causing migration and how to fix it?

Also I have noticed that the underlying volume on XOSTOR/linstor that was created and started to be populated does get cleaned up when the migrate fails.

This is using XO from the sources - updated fairly recently (commit 8ed84) and XO server 5.92.0.

olivierlambert

It could be interesting to understand why the migration failed the first time. Is there absolutely no error during this first migration?

geoffbland

@olivierlambert Thanks for the prompt response.

I am pretty sure there was no error reported but as I cleared down the logs when I retried from on export/import I can't be 100% sure.

So I tested migration on another VM to try and replicate this and this time migration worked OK.

The only difference I can think of is that the failure occurred on a VM created quite a time ago - whilst the working VM had been created recently.

I will do a few more tests and see if I can replicate this again.

olivierlambert

Okay great If you can reproduce, that would be even better to try to do the migration with xe CLI, this way we remove more moving pieces in the middle