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Re: [libvirt] [PATCH v3 9/9] virsh: selective block device migration




On 05/26/2015 09:01 AM, Michal Privoznik wrote:
> From: Pavel Boldin <pboldin mirantis com>
> 
> Add `virsh migrate' option `--migratedisks' that allows CLI user to
> explicitly specify block devices to migrate.
> 
> Signed-off-by: Pavel Boldin <pboldin mirantis com>
> Signed-off-by: Michal Privoznik <mprivozn redhat com>
> ---
>  tools/virsh-domain.c | 23 +++++++++++++++++++++++
>  tools/virsh.pod      | 21 ++++++++++++---------
>  2 files changed, 35 insertions(+), 9 deletions(-)
> 
> diff --git a/tools/virsh-domain.c b/tools/virsh-domain.c
> index 91a1ca2..41d3829 100644
> --- a/tools/virsh-domain.c
> +++ b/tools/virsh-domain.c
> @@ -9889,6 +9889,10 @@ static const vshCmdOptDef opts_migrate[] = {
>       .type = VSH_OT_STRING,
>       .help = N_("filename containing updated XML for the target")
>      },
> +    {.name = "migratedisks",
> +     .type = VSH_OT_STRING,
> +     .help = N_("comma separated list of disks to be migrated")
> +    },
>      {.name = NULL}
>  };
>  
> @@ -9948,6 +9952,25 @@ doMigrate(void *opaque)
>                                  VIR_MIGRATE_PARAM_DEST_NAME, opt) < 0)
>          goto save_error;
>  
> +    if (vshCommandOptStringReq(ctl, cmd, "migratedisks", &opt) < 0)
> +        goto out;
> +    if (opt) {
> +        char **val = NULL;
> +
> +        val = virStringSplit(opt, ",", 0);
> +
> +        if (virTypedParamsAddStringList(&params,
> +                                        &nparams,
> +                                        &maxparams,
> +                                        VIR_MIGRATE_PARAM_MIGRATE_DISKS,
> +                                        (const char **)val) < 0) {
> +            VIR_FREE(val);
> +            goto save_error;
> +        }
> +
> +        VIR_FREE(val);
> +    }
> +
>      if (vshCommandOptStringReq(ctl, cmd, "xml", &opt) < 0)
>          goto out;
>      if (opt) {
> diff --git a/tools/virsh.pod b/tools/virsh.pod
> index d588e5a..9275091 100644
> --- a/tools/virsh.pod
> +++ b/tools/virsh.pod
> @@ -1521,6 +1521,7 @@ to the I<uri> namespace is displayed instead of being modified.
>  [I<--compressed>] [I<--abort-on-error>] [I<--auto-converge>]
>  I<domain> I<desturi> [I<migrateuri>] [I<graphicsuri>] [I<listen-address>]
>  [I<dname>] [I<--timeout> B<seconds>] [I<--xml> B<file>]
> +[I<--migratedisks> B<disk-list>]
>  
>  Migrate domain to another host.  Add I<--live> for live migration; <--p2p>
>  for peer-2-peer migration; I<--direct> for direct migration; or I<--tunnelled>
> @@ -1536,15 +1537,17 @@ with incremental copy (same base image shared between source and destination).
>  In both cases the disk images have to exist on destination host, the
>  I<--copy-storage-...> options only tell libvirt to transfer data from the
>  images on source host to the images found at the same place on the destination
> -host. I<--change-protection> enforces that no incompatible configuration
> -changes will be made to the domain while the migration is underway; this flag
> -is implicitly enabled when supported by the hypervisor, but can be explicitly
> -used to reject the migration if the hypervisor lacks change protection
> -support.  I<--verbose> displays the progress of migration.  I<--compressed>
> -activates compression of memory pages that have to be transferred repeatedly
> -during live migration. I<--abort-on-error> cancels the migration if a soft
> -error (for example I/O error) happens during the migration. I<--auto-converge>
> -forces convergence during live migration.
> +host. By default only non-shared non-readonly images are transfered. Use
> +I<--migratedisks> to explicitly specify a list of disk targets to transfer.
> +B<disk-list> is a comma separated list then.  I<--change-protection> enforces
> +that no incompatible configuration changes will be made to the domain while the
> +migration is underway; this flag is implicitly enabled when supported by the
> +hypervisor, but can be explicitly used to reject the migration if the
> +hypervisor lacks change protection support.  I<--verbose> displays the progress
> +of migration.  I<--compressed> activates compression of memory pages that have
> +to be transferred repeatedly during live migration. I<--abort-on-error> cancels
> +the migration if a soft error (for example I/O error) happens during the
> +migration. I<--auto-converge> forces convergence during live migration.
>  
>  B<Note>: Individual hypervisors usually do not support all possible types of
>  migration. For example, QEMU does not support direct migration.
> 

Assuming the new text is:

"By default only non-shared non-readonly images are transfered. Use
I<--migratedisks> to explicitly specify a list of disk targets to
transfer. B<disk-list> is a comma separated list then."

Change to:

"By default only non-shared non-readonly images are transferred. Use
I<--migratedisks> to explicitly specify a list of disk targets to
transfer via the comma separated B<disk-list> argument."

Note: transfered was misspelled...  [I just searched on "comma " in the
existing document to find a few different examples...]

ACK (although existing still holds too!)

John


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