Symptoms

You deploy a VMware vSphere Data Protection (VDP) appliance on a server that is running Windows Storage Server 2008 R2 or Windows Storage Server 2012. When the deployment accesses the Network File System (NFS) shares on the server, the deployment fails, and you receive the following error message:

Error writing to disk.

Additionally, messages that resemble the following are logged to the "/var/log/vmkernel.log" file during the failure:

# tail –f /var/log/vmkernel.log
2013-03-15T09:30:03.820Z cpu2:9466)BC: 3115: Blocking due to no free buffers. nDirty = 995 nWaiters = 1
2013-03-15T09:30:03.940Z cpu2:9466)BC: 3115: Blocking due to no free buffers. nDirty = 988 nWaiters = 1
2013-03-15T09:30:04.110Z cpu2:9466)BC: 3115: Blocking due to no free buffers. nDirty = 988 nWaiters = 1
2013-03-15T09:30:04.220Z cpu2:9466)BC: 3115: Blocking due to no free buffers. nDirty = 982 nWaiters = 1
2013-03-15T09:30:04.400Z cpu2:9466)BC: 3115: Blocking due to no free buffers. nDirty = 988 nWaiters = 1
2013-03-15T09:30:04.520Z cpu2:9466)BC: 3115: Blocking due to no free buffers. nDirty = 920 nWaiters = 1
2013-03-15T09:31:34.300Z cpu22:9466)BC: 3115: Blocking due to no free buffers. n Dirty = 905 nWaiters = 1
2013-03-15T09:33:07.710Z cpu18:9466)BC: 3115: Blocking due to no free buffers. nDirty = 975 nWaiters = 1
2013-03-15T09:34:45.030Z cpu8:9466)BC: 3115: Blocking due to no free buffers. nDirty = 970 nWaiters = 1
2013-03-15T09:35:17.139Z cpu22:10713)WARNING: UserLinux: 1331: unsupported: (void)
2013-03-15T09:36:16.959Z cpu4:9466)BC: 3115: Blocking due to no free buffers. nDirty = 961 nWaiters = 1
2013-03-15T09:38:30.167Z cpu2:9466)BC: 3115: Blocking due to no free buffers. nDirty = 977 nWaitrs = 1
2013-03-15T09:40:18.908Z cpu0:9466)BC: 3115: Blocking due to no free buffers. nDirty = 977 nWaitrs = 1
2013-03-15T09:42:04.068Z cpu0:8221)NFSLock: 610: Stop accessing fd 0x41000ad83078 3
2013-03-15T09:42:11.082Z cpu2:8194)StorageApdHandler: 248: APD Timer started for ident [e22d08a3-f45c4254]
2013-03-15T09:42:11.082Z cpu2:8194)StorageApdHandler: 395: Device or filesystem with identifier [e22d08a3-f45c4254] has entered the All Paths Down state.
2013-03-15T09:42:11.082Z cpu2:8194)StorageApdHandler: 846: APD Start for ident [e22d08a3-f45c4254]!
2013-03-15T09:43:03.972Z cpu2:8194)NFSLock: 570: Start accessing fd 0x41000ad83078 againNote After the failure occurs and the vSphere client is updated, the NFS data store comes back online.

Cause

This problem occurs specifically at 99 percent of progress during the VDP deployment. When the second disk is about to be deployed, the NFS data store becomes inaccessible to an ESX host, and the deployment fails with the error message "Error writing to disk." VMware backups to a network access server (NAS) cannot finish when the NFS server cannot set file sparse on the files that are created by the ESX client.

As soon as the failure is logged to the Vmkernel.log file, you receive the "Error writing to disk" error message.

Resolution

This hotfix is also available at Microsoft Update Catalog.

Hotfix information

A supported hotfix is available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing the problem described in this article. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, go to the following Microsoft website:

http://support.microsoft.com/contactus/?ws=supportNote The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

To apply this hotfix, you must be running Windows Server 2008 R2 Service Pack 1 (SP1) or Windows Server 2012.

For information about how to obtain a Windows Server 2008 R2 service pack, see Information about Service Pack 1 for Windows 7 and for Windows Server 2008 R2.

Restart requirement

You must restart the computer after you apply this hotfix.

Hotfix replacement information

This hotfix does not replace a previously released hotfix.

The English (United States) version of this hotfix installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and the times may change when you perform certain operations on the files.

Windows Server 2008 R2 file information notesImportant Windows 7 hotfixes and Windows Server 2008 R2 hotfixes are included in the same packages. However, hotfixes on the Hotfix Request page are listed under both operating systems. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 7/Windows Server 2008 R2" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, SR_Level (RTM, SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table.

    Version

    Product

    SR_Level

    Service branch

    6.1.760
    1.
    18xxx

    Windows Server 2008 R2

    SP1

    GDR

    6.1.760
    1.
    22xxx

    Windows Server 2008 R2

    SP1

    LDR

  • GDR service branches contain only those fixes that are widely released to address widespread, extremely important issues. LDR service branches contain hotfixes in addition to widely released fixes.

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2008 R2" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Msnfsflt.mof

Not applicable

4,460

05-Nov-2010

02:11

Not applicable

Nfs-servercore-ppdlic.xrm-ms

Not applicable

3,001

06-May-2013

06:21

Not applicable

Nfssvr.mof

Not applicable

6,195

05-Nov-2010

02:11

Not applicable

Nfssvr.sys

6.1.7601.18147

736,256

06-May-2013

03:17

x64

Msnfsflt.mof

Not applicable

4,460

05-Nov-2010

02:11

Not applicable

Nfs-servercore-ppdlic.xrm-ms

Not applicable

3,001

06-May-2013

05:44

Not applicable

Nfssvc.exe

6.1.7601.22318

41,472

06-May-2013

03:01

x64

Nfssvr.mof

Not applicable

6,195

05-Nov-2010

02:11

Not applicable

Nfssvr.sys

6.1.7601.22318

737,280

06-May-2013

03:02

x64

For all supported IA-64-based versions of Windows Server 2008 R2

File name

File version

File size

Date

Time

Platform

Msnfsflt.mof

Not applicable

4,460

05-Nov-2010

02:11

Not applicable

Nfs-servercore-ppdlic.xrm-ms

Not applicable

3,001

06-May-2013

04:55

Not applicable

Nfssvr.mof

Not applicable

6,195

05-Nov-2010

02:11

Not applicable

Nfssvr.sys

6.1.7601.18147

1,591,296

06-May-2013

02:25

IA-64

Msnfsflt.mof

Not applicable

4,460

05-Nov-2010

02:11

Not applicable

Nfs-servercore-ppdlic.xrm-ms

Not applicable

3,001

06-May-2013

04:46

Not applicable

Nfssvc.exe

6.1.7601.22318

90,624

06-May-2013

02:29

IA-64

Nfssvr.mof

Not applicable

6,195

05-Nov-2010

02:11

Not applicable

Nfssvr.sys

6.1.7601.22318

1,593,344

06-May-2013

02:30

IA-64

Windows Server 2012 file information notesImportant Windows 8 and Windows Server 2012 hotfixes are included in the same packages. However, only "Windows 8" is listed on the Hotfix Request page. To request the hotfix package that applies to one or both operating systems, select the hotfix that is listed under "Windows 8" on the page. Always refer to the "Applies To" section in articles to determine the actual operating system that each hotfix applies to.

  • The files that apply to a specific product, milestone (RTM,SPn), and service branch (LDR, GDR) can be identified by examining the file version numbers as shown in the following table:

    Version

    Product

    Milestone

    Service branch

    6.2.920 0.16 xxx

    Windows Server 2012

    RTM

    GDR

    6.2.920 0.20 xxx

    Windows Server 2012

    RTM

    LDR

  • The MANIFEST files (.manifest) and the MUM files (.mum) that are installed for each environment are listed separately in the "Additional file information for Windows Server 2012" section. MUM and MANIFEST files, and the associated security catalog (.cat) files, are extremely important to maintain the state of the updated components. The security catalog files, for which the attributes are not listed, are signed with a Microsoft digital signature.

For all supported x64-based versions of Windows Server 2012

File name

File version

File size

Date

Time

Platform

Msnfsflt.sys

6.2.9200.16453

32,256

08-Nov-2012

04:00

x64

Nfs-servercore-ppdlic.xrm-ms

Not Applicable

2,893

11-May-2013

09:15

Not Applicable

Nfssvc.exe

6.2.9200.16453

67,584

08-Nov-2012

04:22

x64

Nfssvr.mof

Not Applicable

6,233

06-Jul-2012

20:34

Not Applicable

Nfssvr.sys

6.2.9200.16610

1,249,792

11-May-2013

06:10

x64

Nfs-servercore-ppdlic.xrm-ms

Not Applicable

2,893

11-May-2013

09:19

Not Applicable

Nfssvr.sys

6.2.9200.20714

1,249,792

11-May-2013

06:26

x64


Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

More Information

See Description of the standard terminology that is used to describe Microsoft software updates.

Additional file information for Windows Server 2008 R2

Additional files for all supported x64-based versions of Windows Server 2008 R2

File name

Amd64_18c890acc496fc62c9501b032c476751_31bf3856ad364e35_6.1.7601.18147_none_8e067325ff11cf1d.manifest

File version

Not applicable

File size

706

Date (UTC)

07-May-2013

Time (UTC)

16:13

Platform

Not applicable

File name

Amd64_ffe5b07b28994942dde0701ddc81c973_31bf3856ad364e35_6.1.7601.22318_none_94ed31fada6cc6df.manifest

File version

Not applicable

File size

706

Date (UTC)

07-May-2013

Time (UTC)

16:13

Platform

Not applicable

File name

Amd64_microsoft-windows-nfs-servercore_31bf3856ad364e35_6.1.7601.18147_none_b9ad209d1e01021c.manifest

File version

Not applicable

File size

41,883

Date (UTC)

07-May-2013

Time (UTC)

16:15

Platform

Not applicable

File name

Amd64_microsoft-windows-nfs-servercore_31bf3856ad364e35_6.1.7601.22318_none_ba582f5c37056491.manifest

File version

Not applicable

File size

41,883

Date (UTC)

07-May-2013

Time (UTC)

16:15

Platform

Not applicable

File name

Update-bf.mum

File version

Not applicable

File size

1,655

Date (UTC)

07-May-2013

Time (UTC)

16:13

Platform

Not applicable

Additional files for all supported IA-64-based versions of Windows Server 2008 R2

File name

Ia64_40ae35579ad92f787709ba59c40892b9_31bf3856ad364e35_6.1.7601.18147_none_97c46197d327fac4.manifest

File version

Not applicable

File size

704

Date (UTC)

07-May-2013

Time (UTC)

16:13

Platform

Not applicable

File name

Ia64_df7b1328370ef9512543b247d3348aea_31bf3856ad364e35_6.1.7601.22318_none_01bd2aadcfca38bb.manifest

File version

Not applicable

File size

704

Date (UTC)

07-May-2013

Time (UTC)

16:13

Platform

Not applicable

File name

Ia64_microsoft-windows-nfs-servercore_31bf3856ad364e35_6.1.7601.18147_none_5d90290f65a199e2.manifest

File version

Not applicable

File size

41,881

Date (UTC)

07-May-2013

Time (UTC)

16:13

Platform

Not applicable

File name

Ia64_microsoft-windows-nfs-servercore_31bf3856ad364e35_6.1.7601.22318_none_5e3b37ce7ea5fc57.manifest

File version

Not applicable

File size

41,881

Date (UTC)

07-May-2013

Time (UTC)

16:13

Platform

Not applicable

File name

Update-bf.mum

File version

Not applicable

File size

1,445

Date (UTC)

07-May-2013

Time (UTC)

16:13

Platform

Not applicable

Additional file information for Windows Server 2012

Additional files for all supported x64-based versions of Windows Server 2012

File name

Amd64_3f31bffb95ff31878b4d587bf2b5a002_31bf3856ad364e35_6.2.9200.16610_none_be0b478ce33c03c2.manifest

File version

Not Applicable

File size

706

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable

File name

Amd64_c09dd585e2d93057c330e6c15dda2538_31bf3856ad364e35_6.2.9200.20714_none_aace85ff8c731f03.manifest

File version

Not Applicable

File size

706

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable

File name

Amd64_microsoft-windows-nfs-servercore_31bf3856ad364e35_6.2.9200.16610_none_b4b603d690dab777.manifest

File version

Not Applicable

File size

38,339

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable

File name

Amd64_microsoft-windows-nfs-servercore_31bf3856ad364e35_6.2.9200.20714_none_b543a1c9a9f4bc9d.manifest

File version

Not Applicable

File size

38,339

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable

File name

Package_1_for_kb2846602_bf~31bf3856ad364e35~amd64~~6.2.1.0.mum

File version

Not Applicable

File size

1,796

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable

File name

Package_1_for_kb2846602~31bf3856ad364e35~amd64~~6.2.1.0.mum

File version

Not Applicable

File size

2,509

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable

File name

Package_for_kb2846602_rtm_bf~31bf3856ad364e35~amd64~~6.2.1.0.mum

File version

Not Applicable

File size

1,451

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable

File name

Package_for_kb2846602_rtm~31bf3856ad364e35~amd64~~6.2.1.0.mum

File version

Not Applicable

File size

1,470

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable

File name

Update-bf.mum

File version

Not Applicable

File size

1,584

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable

File name

Update.mum

File version

Not Applicable

File size

1,609

Date (UTC)

11-May-2013

Time (UTC)

19:18

Platform

Not Applicable


References

The third-party products that this article discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Need more help?

Expand your skills
Explore Training
Get new features first
Join Microsoft Insiders

Was this information helpful?

What affected your experience?

Thank you for your feedback!

×