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1. Connect to newly launched VM instance

  • Using RDP client connect to VM instance with the default account name and initial password configured by the cloud provider.
  • Change the default password to your own password.
  • Optionally create additional users if needed.

2. Start the Crossmeta Drivers

  • Launch Windows Command Prompt or PowerShell in Administrator mode.

  • Navigate to Crossmeta installation directory c:\program files\crossmeta and run the script service_crossmeta.cmd as follows.

    Code Block
    C:\Users\Administrator>cd "\Program Files\crossmeta" 
    C:\Program Files\crossmeta>service_crossmeta.cmd status 
    cxvfs is STOPPED cxfuse is STOPPED
    cxnfs is STOPPED cxhfs is STOPPED 
    cxvfsmgr is STOPPED
    C:\Program Files\crossmeta>service_crossmeta.cmd start 
    Starting Crossmeta kernel driver.
    The CROSSMETA Manager service is starting. 
    The CROSSMETA Manager service was started successfully. 
    Running Crossmeta 2.0.2-RELEASE #240: Mon Apr 8 18:17:44 PDT 2019 on WINNT/10.0_Build 
    C:\Program Files\crossmeta>
  • Once Crossmeta drivers have loaded successfully the Crossmeta V: drive will be available for your use


On this page:

Table of Contents

3. Configure your first object storage

objbaker is the program that provides access to object storage for the cloud gateway software. To start with the configuration you would need access key and secret generated by your provider, if you are using object storage in multi-cloud environment or if the compute engine was not authorized to perform any S3 object access operations.

titleAWS EC2

For AWS EC2 instance created with IAM role that authorizes S3 operations it may not be required to configure the accessId and accessKey within the software. Instead use the option --accessEC2IAM=ROLE option with objbaker. This will acquire S3 credentials from EC2 machine via IAM role.

  • Create access file with credentials

Create file v:\etc\.s3wasabi_passwd using notepad and add the access information in this format accessId:accessKey. The accessId could be account ID, and the accessKey is base64 encoded secret.


By starting filename with dot you would avoid Windows adding any .txt extension to the above file. Also make sure there are no extraneous characters or newlines in this file.  This file is accessed by Crossmeta programs as /etc/.s3wasabi_passwd, while WIN32 programs access as v:\etc\.s3wasabi_passwd

  • Location of SSL certficate bundle

    For SSL to work the curl library needs to know the location of its CA CERT bundle, which is installed in c:\program files\crossmeta.  When you run the objbaker this information is provided with --cacert=ca-bundle.crt option . While running interactively since the startup directory is c:\program files\crossmeta this would work. But when the program is running as NT service the startup directory would be c:\windows\syswow64. In that case either copy ca-bundle.crt to c:\windows\syswow64 or specify full pathname to --cacert option.

  • List buckets with objbaker

    Before configuring object disk with Windows, make sure objbaker can list the buckets from your storage account.  The baseURL is the most important parameter and should match with access URL of the cloud provider.  You should use HTTPS for secure SSL access.


    For Azure baseURL will contain the <storage-account-name>

    The baseURL should end with slash character /

    The baseURL option can be skipped for Amazon AWS alone

    Code Block
    C:\Program Files\crossmeta>objbacker.exe  --cacert=ca-bundle.crt --ssl  --accessFile=/etc/.s3azure_passwd
    --s3Type=azure --baseURL=  --bucketCommand=list

    Code Block
    C:\Program Files\crossmeta>objbacker.exe  --cacert=ca-bundle.crt  --ssl --accessFile=/etc/.s3amazon_passwd

    Code Block
    titleGoogle Cloud
    C:\Program Files\crossmeta>objbacker.exe --cacert=ca-bundle.crt --ssl  --accessFile=/etc/.s3google_passwd 
     --s3Type=google_s3  --baseURL=   --bucketCommand=list

    Code Block
    C:\Program Files\crossmeta>objbacker.exe  --cacert=ca-bundle.crt --ssl  --accessFile=/etc/.s3wasabi_passwd
     --baseURL=   --bucketCommand=list

    For troubleshooting add --debug-http to the above command to get detailed REST API output.

  • Configure object storage as VHD

    Before configuring object disk with Windows make sure the Crossmeta Fuse driver has started. If required start the driver as follows

    Code Block
    C:\Program Files\crossmeta>net start cxfuse 
    The CROSSMETA FUSE kernel mode driver service was started successfully.
  • Options to objbaker

Logical size of VHDX up to 64TB allowed by Windows10T--size=10T
Block size of object files. Large block size reduces object access costs.  This should match file system allocation size for optimal performance1MB--blockSize=1024K
Directory to use as mount point in Crossmeta drivemnt/mnt
No caching  to prevent stale data
Specify desired filename for object disk.  This should have extension vhdx for Windows to use it
S3 access credential file name. Some file in Crossmeta drive.accessId:accessKey--accessFile=/etc/.s3wasabi_passwd
S3 Type option to identify cloud object storage api.  The default is amazon_s3. Mandatory option for Azure Blobs




Region option.  This option is mandatory for Amazon S3us-west-1--region=us-west-1

Access URL for the object storage.  Must be specified for all S3 object provider other than Amazon

Azure blobs contain the storage account name in the URL.

zfstest is the storage account name for Azure

  • Mount object storage bucket

    For Windows to make use of  object storage bucket  we have to intialize the object storage as VHDX image.  VHDX is preferred over VHD because of inherent journal feature to protect against unsafe shutdown and also it can support up to 64TB for a single image.  This step is performed in foreground interactively to make sure it is working before configuring it as service later.  In the following example object storage bucket smbtest1 is being mounted. Please make note of the -f option for foreground.  Also for filename we chose as extension .vhdx

    Code Block
    titleusing bucket smbtest1 from Wasabi
    C:\Program Files\crossmeta>objbacker.exe  --cacert=ca-bundle.crt  --accessFile=/etc/.s3wasabi_passwd  --authVersion=aws2 
     --baseURL= --directIO --noAutoDetect --size=10T --timeout=30 --blockCacheSize=100 
    --blockCacheThreads=8 --minWriteDelay=5000 --md5CacheSize=1000000 --ssl --blockSize=1024K -o no_pagecache --filename=file.vhdx
     smbtest1  /mnt -f
    objbacker.exe: auto-detection disabled; using configured block size 1m and file size 10t
     INFO: s3backer process 5312 for /mnt started
     INFO: mounting /mnt
    Code Block
    titleusing bucket disk1 from Azure
    C:\Program Files\crossmeta>objbacker.exe  --cacert=ca-bundle.crt  --accessFile=/etc/.s3azure_passwd  --s3Type=azure
     --baseURL= --directIO --noAutoDetect --size=10T --timeout=30 --blockCacheSize=100 
    --blockCacheThreads=8 --minWriteDelay=5000 --md5CacheSize=1000000 --ssl --blockSize=1024K -o no_pagecache --filename=file.vhdx
     disk1  /mnt -f
    objbacker.exe: auto-detection disabled; using configured block size 1m and file size 10t
     INFO: s3backer process 5512 for /mnt started
     INFO: mounting /mnt

    After the above command finishes the object storage is accessible as V:\mnt\file.vhdx as one giant file with logical capacity as 10TB.

    Code Block
    C:\Program Files\qemu>dir v:\mnt
     Volume in drive V is vfsroot
     Volume Serial Number is 0122-B5C1
     Directory of v:\mnt
    05/22/2019  07:48 PM    <DIR>          .
    05/22/2019  07:48 PM    <DIR>          ..
    05/22/2019  07:48 PM10,995,116,277,760 file.vhdx
    05/22/2019  07:48 PM             1,422 stats
                   2 File(s) 10,995,116,279,182 bytes
                   2 Dir(s)       5,242,880 bytes free 
  • Initialize VHDX on the object storage bucket using qemu-img program available in c:\program files\qemu

    Code Block
    cd c:\program files\qemu
    C:\Program Files\qemu> qemu-img create -f vhdx v:\mnt\file.vhdx 10T
    Formatting 'v:\mnt\file.vhdx', fmt=vhdx size=10995116277760 log_size=1048576 block_size=0
  • Verify VHDX information

    Code Block
    c:\Program Files\qemu> qemu-img info v:\mnt\file.vhdx
    image: v:\mnt\file.vhdx
    file format: vhdx
    virtual size: 10T (10995116277760 bytes)
    disk size: 10T
    cluster_size: 33554432

  • Activate VHDX file as virtual disk in Windows from Administrator PowerShell window

    Code Block
    titleAttach VHDX
    c:\users\Administrator> mount-diskimage  -imagepath v:\mnt\file.vhdx

  • Launch diskmgmt.msc to initialize disk for the first time and assign a drive letter.  You may create a file system within Disk Management GUI or from Command Prompt.

  • Create a file system NTFS or ReFS. Use the actual drive letter that was assigned from the above command and allocation size of 1MB is chosen.

    Code Block
    c:\users\Administrator> format /fs:ntfs /A:1M  /q  F:
    titleNTFS allocation size

    Windows 2019 supports allocation size of 1MB for NTFS file systems while earlier version limited to 64KB only.  This means NTFS created with 1MB allocation size may not be recognized by older Windows.

  • Detach the virtual disk

    Code Block
    titleDetach VHDX
    c:\users\Administrator> dismount-diskimage  -imagepath v:\mnt\file.vhdx

  • Stop the objbaker program to proceed configuration as service

    From Desktop → Crossmeta command shell running as administrator

    Code Block
    titleStop objbaker
    /dev/loop0 on / type ufs (local, read-only)
    devfs on /dev type devfs (local)
    \fuse.chan3596 on /mnt type fuse
    V:\> umount /mnt

    The above command would stop the objbacker program that is running inside another Command Prompt Window.

4. Register as NT service

  • Create service using sc.exe

    If everything worked out fine so far we are ready to make this object disk as service now.  Pick a service name to start this object disk as NT service program automatically from now on. In this example we register objdisk1 as NT service program.

    In the following command line for sc.exe please note that binPath=  and displayName= has no space character before = but space character after =

    Code Block
    titleCreate service
    C:\Program Files\crossmeta>sc  create  objdisk1  start= delayed-auto binpath="\"c:\program files\crossmeta\objbacker.exe\" --cacert=\"c:\program files\crossmeta\ca-bundle.crt\" --accessFile=/etc/.s3wasabi_passwd  --baseURL= --directIO  --noAutoDetect  --size=10T --timeout=30 --blockCacheSize=100 --blockCacheThreads=8 --minWriteDelay=5000 --md5CacheSize=1000000 --ssl --blockSize=1024K -o no_pagecache --filename=file.vhdx smbtest1  /mnt" displayName= "My first object disk smbtest1 from Wasabi" depend= cxfuse
    [SC] CreateService SUCCESS
    C:\Program Files\crossmeta>sc qc objdisk1
    [SC] QueryServiceConfig SUCCESS
    SERVICE_NAME: objdisk1
            TYPE               : 10  WIN32_OWN_PROCESS
            START_TYPE         : 2   AUTO_START  (DELAYED)
            ERROR_CONTROL      : 1   NORMAL
            BINARY_PATH_NAME   : "c:\program files\crossmeta\objbacker.exe" --cacert="c:\program files\crossmeta\ca-bundle.crt" --accessFile=/etc/.s3wasabi_passwd  --baseURL= --directIO  --noAutoDetect  --size=10T --timeout=30 --blockCacheSize=100 --blockCacheThreads=8 --minWriteDelay=5000 --md5CacheSize=1000000 --ssl --blockSize=1024K -o no_pagecache --filename=file.vhdx smbtest1  /mnt
            LOAD_ORDER_GROUP   :
            TAG                : 0
            DISPLAY_NAME       : My first object disk smbtest1 from Wasabi
            DEPENDENCIES       : cxfuse
            SERVICE_START_NAME : LocalSystem
  • Starting the objdisk1 service

    Code Block
    sc start objdisk1
    powershell  mount-diskimage  -imagepath v:\mnt\file.vhdx
  • Stopping the objdisk service

    From Desktop → Crossmeta command shell running as administrator

    Code Block
    v:\> umount /mnt
    v:\> sc stop objdisk1

5. Automatic Startup

  • Create startup script

    To configure object disk every time the system boots up  create a command batch file in c:\program files\crossmeta\s3disks.cmd and add the following to file assuming objdisk1 being the configured service name and /mnt as the mount point.

    Code Block
    titles3disks.cmd file
    net start objdisk1
    powershell mount-diskimage -imagepath v:\mnt\file.vhdx
  • Schedule the above as task

    To run s3disks.cmd every time the Windows starts use schtasks.exe

    Code Block
    schtasks.exe /create /tn "Start Cloud Disks" /ru SYSTEM /Sc ONSTART /tr
    "\"C:\program files\s3disks.cmd\""

    Note how quote characters were  escaped while specifying the command line argument to schtasks.exe, since the directory pathname contains space character.

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