3546484 - S/4HANA Conversion leads to a disk full event on the 'hana/data' and 'hana/log' volumes

• During an S/4HANA Conversion, the server's data and log volumes on the HANA instance both reach full consumption.
  
  
• The target HDB log mode has been configured to "overwrite", meaning no log backups get written.
  
  
• Indexserver trace reports a full log volume or threshold limitation :
  

  [147114]{-1}[-1/-1] 2024-11-12 04:42:42.839759 i Logger           LogSegment.cpp(03175) : log partition disk usage 95% >= log_disk_usage_limit 95%, do not create new log segment
  [147114]{-1}[-1/-1] 2024-11-12 04:42:42.839772 w Logger           LogSegment.cpp(03250) : Log full - log_disk_usage_limit 95% reached in log partition /hana/log/SID/mnt00001/hdb00002.00003/, current disk usage is 95%, awaiting free segment or additional free disk space

    
• Inconsistent and long gaps between savepoints are observed : 
   
  

   [147141]{-1}[-1/-1] 2024-11-12 04:03:07.637671 i Savepoint        SavepointImpl.cpp(03275) : Savepoint current savepoint version: 1885, restart redo log position: 0x734f14cff, next savepoint version: 1886, last snapshot SP version: 0
   [147141]{-1}[-1/-1] 2024-11-12 04:44:34.176039 i Savepoint        SavepointImpl.cpp(03275) : Savepoint current savepoint version: 1886, restart redo log position: 0x9b106dae2, next savepoint version: 1887, last snapshot SP version: 0
   [147141]{-1}[-1/-1] 2024-11-12 08:02:17.261469 i Savepoint        SavepointImpl.cpp(03275) : Savepoint current savepoint version: 1887, restart redo log position: 0xc85f6f109, next savepoint version: 1888, last snapshot SP version: 0
   [147141]{-1}[-1/-1] 2024-11-12 08:06:41.038379 i Savepoint        SavepointImpl.cpp(03275) : Savepoint current savepoint version: 1888, restart redo log position: 0xc868d27fc, next savepoint version: 1889, last snapshot SP version: 0
   [147141]{-1}[-1/-1] 2024-11-12 08:36:40.098832 i Savepoint        SavepointImpl.cpp(03275) : Savepoint current savepoint version: 1889, restart redo log position: 0xd883b310f, next savepoint version: 1890, last snapshot SP version: 0

• According to the results of 'HANA_Disks_Overview.txt' , the data volume and used size began to double. The total disk space available is almost consumed, where the used size reduces greatly
  
  In the example, the Data volume fragmentation began to rapidly increase around 08:00 am and reduce later after further disk space was added:
  
  

  SNAPSHOT_TIME	HOST	PORT	FILE_NAME	FILE_TYPE	E	TOTAL_GB	USED_GB	UNUSED_GB	FRAG_PCT
  12/11/2024 23:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	2407.93	1986.03	421.9	17.52
  12/11/2024 22:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	2497.12	2007.31	489.8	19.61
  12/11/2024 21:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	2567.12	2006.78	560.34	21.82
  12/11/2024 20:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	2717.12	2007.28	709.84	26.12
  12/11/2024 19:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	2817.12	2007.52	809.6	28.73
  12/11/2024 18:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	2992.12	2007.34	984.77	32.91
  12/11/2024 17:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	3097.12	2007.32	1089.79	35.18
  12/11/2024 16:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	3140.75	2007.35	1133.39	36.08
  12/11/2024 15:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	3117.49	3032.45	85.03	2.72
  12/11/2024 14:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	3068.49	3032.42	36.07	1.17
  12/11/2024 13:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	3068.49	2915.44	153.05	4.98
  12/11/2024 12:48	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	3011.45	2980.78	30.66	1.01
  12/11/2024 09:12	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	1116.77	1150.1	-33.33	-2.98
  12/11/2024 08:00	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	1051.68	672.91	378.77	36.01
  12/11/2024 04:30	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	685.43	639.46	45.97	6.7
  12/11/2024 03:06	Host	port	/hana/data/SID/mnt00001/hdb00002.00003/datavolume_0000.dat	DATA	X	335.59	323.57	12.02	3.58

   
  
  
  

• 'HANA_Tables_TopGrowingTables_Size_History.txt' reports that the Columnstore tables increase from 0 to Terabytes of new tablespace consumption under 'SIZE_END_MB' and 'SIZE_CHG_MB' columns during this timeframe :
  
  
  

  BEGIN_TIME	END_TIME	SPACE_LAYER	ST	HOST	PORT	TABLE_NAME	SIZE_BEGIN_MB	SIZE_END_MB	SIZE_CHG_MB	CHG_PCT
  12/11/2024 02:10	13/11/2024 08:10	DISK	-1	Host	port	FAGLFLEXA	0	156892.62	156892.6	9999
  12/11/2024 02:10	13/11/2024 08:10	DISK	-1	Host	port	BSEG	0	147826.58	147826.6	9999
  12/11/2024 02:10	13/11/2024 08:10	DISK	-1	Host	port	CDPOS	0	145276.12	145276.1	9999
  12/11/2024 02:10	13/11/2024 08:10	DISK	-1	Host	port	KONV	0	135118.56	135118.6	9999
  12/11/2024 02:10	13/11/2024 08:10	DISK	-1	Host	port	SWWCNTP0	0	133519.1	133519.1	9999
  12/11/2024 02:10	13/11/2024 08:10	DISK	-1	Host	port	VBFS	0	74691.16	74691.16	9999
  12/11/2024 02:10	13/11/2024 08:10	DISK	-1	Host	port	COEP	0	55026.91	55026.91	9999

  
   
  
  

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SAP S/4HANA

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