I have lot of the following two errors in the event viewer.
SQLVDI: Loc=TriggerAbort. Desc=invoked. ErrorCode=(0). Process=1596. Thread=1280. Server. Instance=MSSQLSERVER. VD=Global\VNBU0-5116-6772-1383750156_SQLVDIMemoryName_0.
BackupVirtualDeviceFile::RequestDurableMedia: Flush failure on backup device 'VNBU0-5116-6772-1383750156'. Operating system error 995(The I/O operation has been aborted because of either a thread exit or an application request.).
C:\>vssadmin list writers
vssadmin 1.1 - Volume Shadow Copy Service administrative command-line tool
(C) Copyright 2001-2005 Microsoft Corp.
Writer name: 'Task Scheduler Writer'
Writer Id: {d61d61c8-d73a-4eee-8cdd-f6f9786b7124}
Writer Instance Id: {1bddd48e-5052-49db-9b07-b96f96727e6b}
State: [1] Stable
Last error: No error
Writer name: 'VSS Metadata Store Writer'
Writer Id: {75dfb225-e2e4-4d39-9ac9-ffaff65ddf06}
Writer Instance Id: {088e7a7d-09a8-4cc6-a609-ad90e75ddc93}
State: [1] Stable
Last error: No error
Writer name: 'Performance Counters Writer'
Writer Id: {0bada1de-01a9-4625-8278-69e735f39dd2}
Writer Instance Id: {f0086dda-9efc-47c5-8eb6-a944c3d09381}
State: [1] Stable
Last error: No error
Writer name: 'System Writer'
Writer Id: {e8132975-6f93-4464-a53e-1050253ae220}
Writer Instance Id: {bc59d9fd-dc80-4405-a1b3-df0dce56533c}
State: [1] Stable
Last error: No error
Writer name: 'ASR Writer'
Writer Id: {be000cbe-11fe-4426-9c58-531aa6355fc4}
Writer Instance Id: {c0f7b459-22fb-4acb-87e9-b2c67fcbf3d4}
State: [1] Stable
Last error: No error
Writer name: 'Shadow Copy Optimization Writer'
Writer Id: {4dc3bdd4-ab48-4d07-adb0-3bee2926fd7f}
Writer Instance Id: {932932e0-853b-40ae-8214-e7f68fa305fd}
State: [1] Stable
Last error: No error
Writer name: 'Registry Writer'
Writer Id: {afbab4a2-367d-4d15-a586-71dbb18f8485}
Writer Instance Id: {1f96e8b9-9737-4f43-802a-1e75e3f4e66a}
State: [1] Stable
Last error: No error
Writer name: 'WMI Writer'
Writer Id: {a6ad56c2-b509-4e6c-bb19-49d8f43532f0}
Writer Instance Id: {5f30c68f-e300-42cb-a944-942e48a369e5}
State: [5] Waiting for completion
Last error: No error
Writer name: 'COM+ REGDB Writer'
Writer Id: {542da469-d3e1-473c-9f4f-7847f01fc64f}
Writer Instance Id: {f9429c38-831d-4d2a-b212-32d5b2cdfd99}
State: [1] Stable
Last error: No error
Writer name: 'BITS Writer'
Writer Id: {4969d978-be47-48b0-b100-f328f07ac1e0}
Writer Instance Id: {82a7a876-ce28-4709-82f6-22a730ca36f6}
State: [1] Stable
Last error: No error