VSS Writer failed

setup w2k8 server standard hosting w2k3 virtual server.

backup exec 12.5 started failing vss error cured reboot has become permanent. nothing in logs on host server bent logs shows:
backup- vrtsrv::\\csfisahost\hyper-v?store\initial store v-79-57344-65233 - aofo: initialization failure on: "vrtsrv::\\csfisahost\hyper-v?virtual?machine\csfisa2_2003". advanced open file option used: microsoft volume shadow copy service (vss).

snapshot provider error (0xe000fed1): failure occurred querying writer status.

check windows event viewer details.

writer name: microsoft hyper-v, writer id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}, last error: vss writer failed, operation can retried (0x800423f3), state: failed during prepare snapshot operation (8).

vssadmin list writers shows:
writer name: 'microsoft hyper-v vss writer'
   writer id: {66841cd4-6ded-4f4b-8f17-fd23f8ddc3de}
   writer instance id: {b12e7f3e-c7d3-4d58-b7f7-cc6d80a10d3a}
   state: [8] failed
   last error: retryable error

vssadmin list providers gives:

provider name: 'microsoft software shadow copy provider 1.0'
   provider type: system
   provider id: {b5946137-7b9f-4925-af80-51abd60b20d5}
   version: 1.0.0.7

any ideas?

i did open case symantec , said ms error , ask you. have.

i hope can help.

try doing following command "vssadmin list writers" , see if of writers in error.

try , clear writers, can manually initiate vs copy "vssadmin create shadow /for=c:".  each hard drive , check writers errors after each new shadow image created. 

of writers show ok, after create shadow copies , there no errors thrown, i'd check scheduled tasks , make sure don't have av scans, defrags, or other disk intensive/vss oriented items running @ same time.

also, check event logs , see if there vss errors occurring. think show in application logs.

can check out kb article on re-registering vss components: http://support.microsoft.com/default.aspx/kb/940032

cheers

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