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Thin LUN Allocated Capaci...

Thin LUN Allocated Capacity has different values in a Remote Replication Pair

Created: Nov 23, 2018 13:15:05Latest reply: Nov 28, 2018 15:23:32 950 9 0 0 0
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This post was last edited by multibear16 at 2018-11-26 02:56. Hello!
We have two OceanStor 5500 V3 V300R003C20SPC200 SPH205 Storage Systems.
2 thin LUNs form a synchronous remote replication pair. Replication pair health and status is "Normal". Secondary Resource Data Status is "Synchronized".
Primary LUN is presented to ESXi 6.5 hosts as a datastore, it has 3 VMs, and vSphere web client shows that used space of that datastore is 7.04 TB. 
Primary LUN's Allocated Capacity in OceanStor DeviceManager is 6.321 TB but Secondary LUN's Allocated Capacity is only 1.814 TB.
1) Why is Primary LUN's Allocated Capacity is lower than datastore used space in vSphere web client?
2) Why is Secondary LUN's Allocated Capacity is so much lower than Primary LUN's Allocated Capacity? Is my data consistent on a Secondary LUN? It can't be just 1.814 TB as I have a VM in the Primary LUN which has a 7TB thin provisioned hard disk with 6.2 TB of real data in it.
I tried to Split the replication and then Synchronize it again, but synchonizing takes less than a minute and after that it shows "Normal/Synchronized" statuses and Secondary LUN's Allocated Capacity stays the same - 1.814 TB.

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olive.zhao
Admin Created Nov 28, 2018 11:31:41

This post was last edited by ganmianpi at 2018-11-28 11:33.

hello， bro ,about your  issue ,
1) Why is Primary LUN's Allocated Capacity is lower than datastore used space in vSphere web client?
please check your HBA card , Because different HBA cards have different calculation units, for example, some calculations are 1TB=1024GB, and some are 1TB=1000GB.Therefore, there is a phenomenon that the capacity displayed on the storage is different from the capacity of the virtual platform.
2).Why is Secondary LUN's Allocated Capacity is so much lower than Primary LUN's Allocated Capacity? Is my data consistent on a Secondary LUN? It can't be just 1.814 TB as I have a VM in the Primary LUN which has a 7TB thin provisioned hard disk with 6.2 TB of real data in it.

When the remote replication lun is initially created, the size of the main lun and the slave lun are the same. If there is no deduplication and compression, this phenomenon will not occur theoretically. The specific problem may need to collect logs for viewing, so please create a ticket to the local TAC to help you better handle the problem. thank  you

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CesarFdoMtz
CesarFdoMtz Created Nov 23, 2018 15:59:14

To confirm your questions is necessary know the configuration for each Oceanstor, replication and LUN and you need to create a service requested to confirm..

 

 

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CesarFdoMtz
CesarFdoMtz Created Nov 23, 2018 16:07:19

This post was last edited by CesarFdoMtz at 2018-11-23 16:09.

Is necessary check the configuration to validate the Smart Dedupe and Smart Compression feature according the Oceanstor model.

 

You will read the Smart Dedupe and Smart Compression to understand why the allocated is different.

http://support.huawei.com/hedex/hdx.do?docid=EDOC1000139844&lang=en&idPath=7919749|7941815|21430818|21462748|21122033

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Root.
Root. Created Nov 24, 2018 03:12:53

Is the LUN type a thin LUN ? if it is Thin LUN , maybe you enable the Smart Dedupe and Smart Compression feature .
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multibear16
multibear16 Created Nov 26, 2018 07:01:17

@CesarFdoMtz @Root.
Hello, guys!
Primary and Secondary LUN's are Thin. We have no Smart Dedupe and Smart Compression licenses, so there is no deduplication and compression.
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multibear16
multibear16 Created Nov 26, 2018 07:01:28

@CesarFdoMtz @Root.
Hello, guys!
Primary and Secondary LUN's are Thin. We have no Smart Dedupe and Smart Compression licenses, so there is no deduplication and compression.
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CesarFdoMtz
CesarFdoMtz Created Nov 26, 2018 15:17:30

Dear, Is necessary create a Ticket to get the new LOGs To check and confirm your questions.
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user22222222
user22222222 Created Nov 27, 2018 09:57:24

It need check the Storage log for detials
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olive.zhao
olive.zhao Admin Created Nov 28, 2018 11:31:41

This post was last edited by ganmianpi at 2018-11-28 11:33.

hello， bro ,about your  issue ,
1) Why is Primary LUN's Allocated Capacity is lower than datastore used space in vSphere web client?
please check your HBA card , Because different HBA cards have different calculation units, for example, some calculations are 1TB=1024GB, and some are 1TB=1000GB.Therefore, there is a phenomenon that the capacity displayed on the storage is different from the capacity of the virtual platform.
2).Why is Secondary LUN's Allocated Capacity is so much lower than Primary LUN's Allocated Capacity? Is my data consistent on a Secondary LUN? It can't be just 1.814 TB as I have a VM in the Primary LUN which has a 7TB thin provisioned hard disk with 6.2 TB of real data in it.

When the remote replication lun is initially created, the size of the main lun and the slave lun are the same. If there is no deduplication and compression, this phenomenon will not occur theoretically. The specific problem may need to collect logs for viewing, so please create a ticket to the local TAC to help you better handle the problem. thank  you

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  • convention：
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10#
CesarFdoMtz
CesarFdoMtz Created Nov 28, 2018 15:23:32

Right, An Specialist must check the LOGs and Configuration.
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