GPFS is 'IBM General Parallel File System', also called
'IBM Spectrum Scale', stalls when a process issues a lot
of fsyncs in a short timeframe.

It is better if the VM I/O is not synchronous.
It is racommended to use writeback caching policy.

In order to permit that it is added VIR_FILE_SHFS_GPFS to
the list of shared file systems in virStorageFileIsClusterFS
function.

Signed-off-by: Diego Michelotto <diego.michelotto@cnaf.infn.it>
---
 src/util/virstoragefile.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
index b2e308d81d..0fe2819dc6 100644
--- a/src/util/virstoragefile.c
+++ b/src/util/virstoragefile.c
@@ -1349,7 +1349,8 @@ int virStorageFileIsClusterFS(const char *path)
     return virFileIsSharedFSType(path,
                                  VIR_FILE_SHFS_GFS2 |
                                  VIR_FILE_SHFS_OCFS |
-                                 VIR_FILE_SHFS_CEPH);
+                                 VIR_FILE_SHFS_CEPH |
+                                 VIR_FILE_SHFS_GPFS);
 }
 
 #ifdef LVS
-- 
2.20.1

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HI all,

any news about this patch?

All the best.
Diego Michelotto
+------------------------------------+
- uff: 051 2095493‬
- skype: diego-mikel8
+------------------------------------+

> Il giorno 27 feb 2019, alle ore 15:07, Diego Michelotto <diego.michelotto@cnaf.infn.it> ha scritto:
> 
> GPFS is 'IBM General Parallel File System', also called
> 'IBM Spectrum Scale', stalls when a process issues a lot
> of fsyncs in a short timeframe.
> 
> It is better if the VM I/O is not synchronous.
> It is racommended to use writeback caching policy.
> 
> In order to permit that it is added VIR_FILE_SHFS_GPFS to
> the list of shared file systems in virStorageFileIsClusterFS
> function.
> 
> Signed-off-by: Diego Michelotto <diego.michelotto@cnaf.infn.it>
> ---
> src/util/virstoragefile.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/src/util/virstoragefile.c b/src/util/virstoragefile.c
> index b2e308d81d..0fe2819dc6 100644
> --- a/src/util/virstoragefile.c
> +++ b/src/util/virstoragefile.c
> @@ -1349,7 +1349,8 @@ int virStorageFileIsClusterFS(const char *path)
>     return virFileIsSharedFSType(path,
>                                  VIR_FILE_SHFS_GFS2 |
>                                  VIR_FILE_SHFS_OCFS |
> -                                 VIR_FILE_SHFS_CEPH);
> +                                 VIR_FILE_SHFS_CEPH |
> +                                 VIR_FILE_SHFS_GPFS);
> }
> 
> #ifdef LVS
> -- 
> 2.20.1
> 

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On 2/27/19 3:07 PM, Diego Michelotto wrote:
> GPFS is 'IBM General Parallel File System', also called
> 'IBM Spectrum Scale', stalls when a process issues a lot
> of fsyncs in a short timeframe.
> 
> It is better if the VM I/O is not synchronous.
> It is racommended to use writeback caching policy.

Using writeback may lead to a data loss if qemu is killed on destination 
and underlying FS has not synced the data. Since I don't have GPFS I 
can't confirm it's behaving safely on migration. And I wasn't fortunate 
finding that on the internet either.

Michal

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