HPE EVA Storage

P2000 SAN presents small LUNS

 
mw_keylogic
New Member

P2000 SAN presents small LUNS

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?

2 REPLIES 2
Thomas Martin
Trusted Contributor

Re: P2000 SAN presents small LUNS

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
Esteemed Contributor

Re: P2000 SAN presents small LUNS

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

 

Page 31-32

Regards,
Hari

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