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Fix warning message during inspection of OceanStor V3 storage regarding SmartTier feature

Publication Date:  2018-02-06 Views:  71 Downloads:  0
Issue Description

Number of disks for tier0 of disk domain [ID: 1]: 10;Number of disks for tier1: 15; Number of disks for tier2: 136.

 

Recovery Suggestion 
1 If there are no existing service data, you are advised to reconfigure the number of disks. The number of disks for each tier of the disk domain is less than or equal to 100.
2 If there are existing service data, the number of disks does not need to be changed.

 

ID  Tier0 Disk Number  Tier1 Disk Number  Tier2 Disk Number 
  --  -----------------  -----------------  ----------------- 
  1   10                 15                 136               

Alarm Information

Number of disks in tier2 exceeds the recommended value.

Handling Process

Run this command to check the number of disks per tier or disk domain:

show disk_domain general

  ID  Tier0 Disk Number  Tier1 Disk Number  Tier2 Disk Number 
  --  -----------------  -----------------  ----------------- 
  1   10                 15                 136       

 

Number of disks for tier0 of disk domain [ID: 1]: 10;Number of disks for tier1: 15; Number of disks for tier2: 136.

 

Recommended Configurations for Disks in the Disk Domain:
You are advised to configure a maximum of 100 disks for each tier in a disk domain. For SmartTier, it is recommended that a maximum of 100 disks be configured for each tier in a disk domain.

 

 

Root Cause

Firmware management limitation.

Solution

Due to firmware management limitations (they are standard industry limitations, not for Huawei only) 50 disks per tier is highly recommended. The capacity of the disks is not important. A maximum of 100 disks is recommended for extra space but the maximum performance of the storage system is reached at 50 disks/tier and 100 disks per disk domain when using SmartTier. Over this amount the performance will drop directly proportional with the numbers of disks added. Over 100 disks will cause some performance loss and reliability issues.

But this is just a recommendation, if you are satisfied with the current performance for the tier exceeding 100 disks, you can add another 5-10 disks to the specific tier. It won’t lower the performance drastically.

When you run out of space on a tier you can add more disks, create a new disk domain and a new tier. Then map the new volume on the hosts and configure it to use the new tier.

Also, it would be best to predict the future capacity needs and maybe use disks with larger capacity.

As you can see, the decision of how many disks/tier to use is yours, depending on your performance needs.

Suggestions

Recommended Configurations for Disks in the Disk Domain:
You are advised to configure a maximum of 100 disks for each tier in a disk domain. For SmartTier, it is recommended that a maximum of 100 disks be configured for each tier in a disk domain.

END