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Slow disk formatting and slow shadow copy on EVA 6000 and Windows 2003

 
Occasional Visitor

Slow disk formatting and slow shadow copy on EVA 6000 and Windows 2003

On a Windows 2003 host with a 500 GB volume (RAID5) on EVA6000 (XCS 5110) we see the following problems:
- a full windows format of the 500 GB disk volume is extremely slow: it takes several hours to complete a full format. Haven't tried a quick format.
- a Windows shadow copy of the volume takes 45 minutes. It should take only several seconds ! The shadow copy storage is on the same volume.

Besides these two extremely slow actions other day to day operations seems to be normal.
I/O performance test show no extreme numbers:

HD Tune: HP HSV200 Benchmark

Transfer Rate Minimum : 62.0 MB/sec
Transfer Rate Maximum : 84.1 MB/sec
Transfer Rate Average : 76.8 MB/sec
Access Time : 0.1 ms
Burst Rate : 65.8 MB/sec
CPU Usage : 27.5%


The volume is in use as file share for several hundreds users without any noticable problems.
Backup through HP Dataprotector disk agent also shows normal backup througput.

Anyone had the same problem and possibly a solution ?