P2000 SAN presents small LUNS

[mw_keylogic]

an iSCSI  P2000 SAN with 6*450GB in RAID 5 with online spare - has 1800GB usable capacity after overheads- when presented as a LUN it only presents 1687GB to the iSCSI host.

If I step back and present smaller luns:

a LUN presented of 400GB will lose about 10% capacity when presented.

any LUN presented shows 7-10% less size than expected (RAW size presented to connected OS - VMware and MS iSCSI show the same results). eg 100GB LUN only shows 92GB raw drive to OS

Is this behavior expected?

[Thomas Martin]

Hello,

the P2000 count the with 1GB=1000000kB, but all OS count 1 GB=1024000kB. 450GB HDD is RAW Capacity calculated with 450GB (Count 1000) = ca. 419 GB (Count 1024). So 4x419=1676GB

Thomas

[hvhari]

Operating systems usually show volume size in base 2. Disk drives usually show size in base 10.

Refer the SMU reference guide from below link.

http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=in&docIndexId=66864&taskId=101&prodTypeId=12169&prodSeriesId=4118559

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