|Article Number: 496538||Article Version: 5||Article Type: How To|
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VPlexcli:/> rebuild show-transfer-size * This command will return transfer rate for all devices
VPlexcli:/> rebuild show-transfer-size --devices * This command will return device name and transfer size
device name transfer-size
Default 128k This has been tested and works best
Max size 128M
Set the transfer-size on a specified device to 1M:
VPlexcli:/> rebuild set-transfer-size --devices /clusters/cluster-1/devices/testdevice --limit 1M
** alternatively: VPlexcli:/distributed-storage/distributed-devices/DD_1234> set transfer-size 1M
setting transfer size at component level
VPlexcli:/distributed-storage/distributed-devices/DD_1234/distributed-device-components/device_Symm1234_1234_1> set transfer-size 1M
Set the transfer-size for all devices to 2M:
VPlexcli:/> rebuild set-transfer-size /clusters/*/devices/* 2M
Set the transfer-size for all distributed devices to 10K:
VPlexcli:/distributed-storage/distributed-devices> rebuild set-transfer-size * 10k
Be sure to note if 'throughput' increases after increasing the transfer size.
It's not always the case that increasing the transfer rate will speed up the rebuilds.
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occur whenever a new mirror is added to device, as in the case of a migration, or whenever an existing device is marked out of date.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 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.