VPLEX: Distributed device hierarchy is missing extent

Table of Contents

Detailed Article

Symptoms

Cause

Resolution

Additional Info

Affected Products

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Summary: This article talks to the issue where the distributed device hierarchy is missing an extent and how to resolve the missing extent.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.

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Symptoms

When viewing the component hierarchy for a distributed device, a device leg is missing an extent.

VPlexcli:/> show-use-hierarchy distributed-storage/distributed-devices/device_CLARiiON1234_LUN_00030_1 storage-view: Windows (cluster-1) consistency-group: CG-CS-Test (synchronous) virtual-volume: device_CLARiiON1234_LUN_00030_1_vol (1G, distributed @ cluster-1, running) distributed-device: device_CLARiiON1234_LUN_00030_1 (1G, raid-1) distributed-device-component: device_C2_CLARiiON1234_LUN_00015_1 (1G, raid-0, cluster-2) extent: extent_C2_CLARiiON1234_LUN_00015_1 (1G) storage-volume: C2_CLARiiON1234_LUN_00015 (1G) logical-unit: VPD83T3:60060160xxxxxxxx56343574ffa5e811 storage-array: EMC-CLARiiON-APM00xxxxxxxxx distributed-device-component: extent_CLARiiON1234_LUN_00030_1 (1G, cluster-1)
<-- The missing extent is expected here.
storage-volume: CLARiiON1234_LUN_00030 (1G)
logical-unit: VPD83T3:60060160xxxxxxxx815405d2daae811 storage-array: EMC-CLARiiON-APM00xxxxxxxxx

When the distributed device components are listed, one appears as an extent with a geometry of "slice".

VPlexcli:/> ll /distributed-storage/distributed-devices/device_CLARiiON1234_LUN_00030_1/distributed-device-components/ /distributed-storage/distributed-devices/device_CLARiiON1234_LUN_00030_1/distributed-device-components: Name Cluster Child Fully Operational Health Block Block Capacity Geometry Total ---------------------------------- --------- Slot Logged Status State Count Size -------- -------- FreeSpace ---------------------------------- --------- ----- ------ ----------- ------ ------ ----- -------- -------- --------- device_C2_CLARiiON1234_LUN_00015_1 cluster-2 1 true ok ok 262144 4K 1G raid-0 - extent_CLARiiON1234_LUN_00030_1 cluster-1 0 true ok ok 262144 4K 1G slice - <-- Note the "Geometry" for this extent is listed as 'slice'.

Cause

This issue may occur as a result of a extent migration on the volume, under rare circumstances. After the migration is complete, an R0 (RAID 0) device is missing on top of the extent in the component hierarchy.

Resolution

The missing R0 device in the component hierarchy is a cosmetic issue. There will not be any noticeable impact on VPLEX operations from leaving the device in this state. However, if a resolution of this cosmetic issue is desired, please open a Service Request with VPLEX support and mention this article.

The resolution for this display issue is to use internal firmware commands to insert a new R0 device on top of the extent. This process will not cause any impact but should only be completed by technical support.

Permanent Fix:
As this is a cosmetic issue there is no permanent fix at this time.