VPLEX: How to Set a Rebuild Transfer Size


Welcome to Dell EMC VPlex
‘How to’ series. How to Set Rebuild Transfer Size. This is based on Dell EMC
Knowledge Base Article #496538. This video presents the following: When do rebuilds occur?, type of rebuilds and how to set
rebuild transfer size. A rebuild will occur in
the following scenarios. Logging failed, mirror will
be marked out of date. Whenever a new mirror
is added to device as in the case of a migration. Whenever an existing device
is marked out of date. A distributed raid-1 has
one leg marked out of date due to storage issues or
inter-cluster link issues. A logging rebuild will occur when a mirror (leg) of
a distributed device is removed from the source. VPlex has two types of rebuilds: full and logging. A full rebuild will occur whenever
a new mirror is added to device as in the case of a migration or whenever an existing device
is marked out-of-date. A logging rebuild will occur when a mirror (leg) of
a distributed device is removed or added
from the source. The VPlex will track the changes made on the blocks of the source
device via the logging volume and apply these changes to
the mirror once it is re-attached. Log in to the VPlexcli. This command will return
transfer rate for all devices. This command will return
device name and transfer size. This command will set the transfer
size on a specified device. You can also cd into the context and set the transfer
size at component level. This command will set
the transfer size for all devices. This command will set the transfer
size for all distributed devices. VPlex rebuild traffic does
not do Quality of Service and is not aware of
contention/traffic. If transfer rate is set too high
it will affect performance. The rebuild type
should be set to full and this cannot be set manually. If the volumes are thin provisioned
then the rebuild should be thin. If the volumes are
thick provisioned then the rebuild should be thick. The VPlex chooses
the best fit rebuild type and this cannot be set manually. It will always try to
rebuild incrementally initially and if this is not possible,
then a full rebuild begins. For more information,
go to support.emc.com and search for the following: KB496538 VPlex How to
Set Rebuild Transfer Size. Thank you for watching.

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