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In general, the network bandwidth can be checked with tools such as iperf, and iperf calculates the maximum bandwidth the network can make. drbdsim injects I/O load into DRX from local drbdsim and receives remote relayed data from remote drbdsim to calculate the throughput that DRX can process on the network. Therefore, DRX will perform best when iperf's result is equal to drbdsim's or when drbdsim's is greater than it by compression. Please refer to Appendix F. drbdsim usage guide for more information on how to use drbdsim.

Based on the above, the factors of optimization are summarized as follows:

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Performance for the DRX can be viewed through the CLI commands provided by the DRX.

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7.2.1 BAB Performance : memusage

This command checks the usage rate and latency of the BAB.

• Check the performance of BAB through BAB usage and latency.
  

  • You can check the usage rate of the BAB set by calculation of "2. Operating Environment".

  • You can see where bottlenecks have occurred by increasing or decreasing the latency value.

• Output Sample

  • Capacity : Indicates the BAB size set in the resource, in Kilobytes.
  • Use (Size) : Indicates BAB usage rate and Size. The unit of size is Kilobytes.
  • BAB Latency is the current (cur), average (avg), maximum (max), and minimum (min) values ​​for the TX, RX, Compress, and Decompress items. The unit is microseconds.
    

    
    

    Code Block
    theme DJango title memusage collapse true
    < general output > [root@c73-p1 dgkim]# drx-ctl mem all -------------------------------------------------------------------------------------- Name Capacity Use (Size) Full Counts -------------------------------------------------------------------------------------- DR-1-3-c73-p2-c73-p1 716800 [>>>>>>>.....................] 23% (163277) 0 10240 [............................] 0% (0) - -------------------------------------------------------------------------------------- DR-2-3-c73-p2-c73-p1 512000 [............................] 0% (0) 0 10240 [............................] 0% (0) - -------------------------------------------------------------------------------------- Active bab counts : 2 < verbose output > [root@c73-p1 dgkim]# drx-ctl mem all -v ---------------------------------------------------------------------------------------------------------- Name Capacity Begin End Use (Size) Full Counts ---------------------------------------------------------------------------------------------------------- DR-1-3-c73-p2-c73-p1 716800 340236152 504137496 [>>>>>>>.....................] 22% (160060) 0 10240 0 0 [............................] 0% (0) - ---------------------------------------------------------------------------------------------------------- DR-2-3-c73-p2-c73-p1 512000 64273922 64273922 [............................] 0% (0) 0 10240 0 0 [............................] 0% (0) - ---------------------------------------------------------------------------------------------------------- Active bab counts : 2 ---------------------------------------------------------------------------------------------------------- name Latency cur avg max min ---------------------------------------------------------------------------------------------------------- DR-1-3-c73-p2-c73-p1 TX BAB 00:00:00.000000 00:00:00.443516 00:00:06.765142 00:00:00.000101 RX BAB 00:00:00.000000 00:00:00.000000 00:00:00.000000 00:00:00.000000 Compress 00:00:00.000088 00:00:00.000087 00:00:00.001439 00:00:00.000001 Decompress 00:00:00.000000 00:00:00.000000 00:00:00.000000 00:00:00.000000 ---------------------------------------------------------------------------------------------------------- DR-2-3-c73-p2-c73-p1 TX BAB 00:00:00.000000 00:00:00.001627 00:00:00.004173 00:00:00.000261 RX BAB 00:00:00.000000 00:00:00.000000 00:00:00.000000 00:00:00.000000 Compress 00:00:00.000000 00:00:00.000113 00:00:00.001440 00:00:00.000001 Decompress 00:00:00.000000 00:00:00.000000 00:00:00.000000 00:00:00.000000 ---------------------------------------------------------------------------------------------------------- Active bab counts : 2 [root@c73-p1 dgkim]#

    
    

7.2.2 Compression performance statistics.: statistics

This command checks the DRX statistics information.

• To view compression statistics, use the filter option in Output mode. 
  • The compression ratio represents the average value and the compression efficiency of the data to be transmitted can be checked.
  • Compression plug-in performance can be checked by the average compression time (cp-avg) and the decompression average time (dc-avg).

• Sample command.

  Code Block
  drx-ctl st all -v --filter=name,type,ratio,cur,best,worst,cp-avg,cp-cur,cp-min,cp-max,dc-avg,dc-cur,dc-min,dc-max

  
  

• Output Sample
  
  • The unit of size is Kilobytes.

  • 압축 ratio는 (압축전 사이즈 / 압축후 사이즈)로 계산되기 때문에 가독성을 위해서 소수점 둘째 자리까지 출력됩니다. 

  • The unit of compress(cp), decompress(de), encypto(ec), decrypto(dc) is microseconds.

    
    

    Code Block
    theme DJango title statistics collapse true
    < verbose output > [root@c69-1 drbd.d]# drx-ctl st all -v ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ name type tx rx t-raw t-net r-raw r-net ratio cur best worst cp-avg cp-cur cp-min cp-max ec-avg ec-cur ec-min ec-max dc-avg dc-cur dc-min dc-max de-avg de-cur de-min de-max ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ r0-c69-2-c69-1 data 184 0 13660 6821 0 1 1.93 0.00 18.07 1.00 0.000098 0 0.000001 0.013818 0 0 0 0 0 0 0 0 0.000189 0 0.000001 0.002338 r0-c69-2-c69-1 meta 0 0 ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ All connections : 2, Established : 2 [root@c69-1 drbd.d]# < use the filter option output> [root@c69-1 drbd.d]# drx-ctl st all -v --filter=name,type,ratio,cur,best,worst,cp-avg,cp-cur,cp-min,cp-max,dc-avg,dc-cur,dc-min,dc-max ----------------------------------------------------------------------------------------------------------- name type ratio cur best worst cp-avg cp-cur cp-min cp-max dc-avg dc-cur dc-min dc-max ----------------------------------------------------------------------------------------------------------- r0-c69-2-c69-1 data 1.91 1.94 18.07 1.00 0.000088 0.000139 0.000001 0.013818 0 0 0 0 r0-c69-2-c69-1 meta ----------------------------------------------------------------------------------------------------------- All connections : 2, Established : 2 [root@c69-1 drbd.d]#

    
    

  • 축약어 설명

    
    

    축약어	설명	축약어	설명	축약어	설명
    tx	TX speed	ratio	compress average ratio	ec	encrypto
    rx	RX speed	cur	compress current ratio	dc	decrypto
    t-net	TX-Network 전송 사이즈	worst	compress worst ratio
    t-raw	TX RAW 사이즈	best	compress best ratio
    r-raw	RX-Network 전송 사이즈	cp	compress
    r-net	RX RAW 사이즈	de	decompress

    
    

7.3. Optimization procedure

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