PowerFlex enable_background_device_scanner, API e alterações de registro

A partir do ScaleIO v2.5, o modo de comparação HF1 incluiu uma nova opção para ignorar a correção dos erros de comparação e reportá-los no arquivo /opt/emc/scaleio/logs/comparison.0. Isso também desativou as funcionalidades de reparo e geração de relatórios de leitura do modo device_only que fazia parte do modo de comparação em um estado normal. 

Juntamente com as alterações de API e scli, alguns registros adicionais foram adicionados aos nós do SDS quando o modo de comparação de scanner em segundo plano é ativado com o HF v3.0.0.2.

Alterações no registro de alterações: /opt/emc/scaleio/sds/logs/comparison.x

 19/11 10:50:12.446570 Scanning combs for device be4c66a400000001, loop #1945 ended, #scanned combs=137, #sec combs (skipped)=69, #primary combs skipped=0, #scanned teeth=19418

Etapas para reduzir o número padrão de arquivos comparações.x de 10 para um número menor:

 echo "tgt_comparison_file_history =2" >> /opt/emc/scaleio/sds/cfg/conf.txt ; pkill sds

Execute isso em todos os SDSs em que os arquivos devem ser reduzidos. Novos arquivos de log de saída CRC32 (contém a saída de hash para os dados de usuário de 1 MB do PRI ou SEC) para validar entre primário e secundário:

 /opt/emc/scaleio/sds/logs/{randomID}_compare_combID_offset_[pri/sec].log

EXEMPLO:

 /opt/emc/scaleio/sds/logs/1259357004_compare_71f2800001b5_18432_pri.log
Trace entry correlating in comparison.x:
13/11 14:03:54.470982 vtreeId a227e28500000000 Comb 71f2800001b5, offset 18432 - compare error - succeeded to fix the secondary by the primary, randId 1259357004.

Logs sds/logs/trc.x correspondentes:

trc.5:13/11 14:03:54.459658 0x7f598e35ddb8:mgStorageRegion_VerifyDataCRC:02769: primary and secondary checksums are different (pri=1025730551, sec=3956700141). will dump the error. randId 1259357004. combId:71f2800001b5,vTree:0xa227e28500000000,offsetVol:0x12da000,offsetInComb:18432,sizeInLbs:2048,phyToothIdx:2608,srcToothIdx:inv,dstToothIdx:inv New:(0,0) Requested:(3,1) volId:0
trc.5:13/11 14:03:54.470972 0x7f598e35ddb8:raidScan_FixSecondaryByPrimary:00295: comb:71f2800001b5,vTree:0xa227e28500000000,offsetVol:0x12da000,offsetTooth:0x0, Comb 71f2800001b5, offset 18432 - fix the secondary by the primary, randId 1259357004, rc = SUCCESS
trc.5:13/11 14:03:54.470988 0x7f598e35ddb8:raidScan_HandleComparisonError:01006: compare error - succeeded to fix the secondary by the primary. randId 1259357004. combId:71f2800001b5,vTree:0xa227e28500000000,offsetVol:0x12da000,offsetInComb:18432,sizeInLbs:2048,phyToothIdx:2608,srcToothIdx:inv,dstToothIdx:inv New:(0,0) Requested:(3,1) volId:0
trc.5:13/11 14:03:54.472246 0x7f598e35ddb8:raidScan_HandleComparisonError:01046: Sent a message to the MDM on compare error (randId 1259357004). combId:71f2800001b5,vTree:0xa227e28500000000,offsetVol:0x12da000,offsetInComb:18432,sizeInLbs:2048,phyToothIdx:2608,srcToothIdx:inv,dstToothIdx:inv New:(0,0) Requested:(3,1) volId:0

Verificando os dois arquivos de saída:

 -rw-rw-rw-. 1 root root     4096 Nov 13 14:03 1259357004_compare_71f2800001b5_18432_pri.log
-rw-r--r--. 1 root root     4096 Nov 19 11:10 1259357004_compare_71f2800001b5_18432_sec.log

diff 1259357004_compare_71f2800001b5_18432_pri.log 1259357004_compare_71f2800001b5_18432_sec.log
Binary files 1259357004_compare_71f2800001b5_18432_pri.log and 1259357004_compare_71f2800001b5_18432_sec.log differ


[root@localhost logs]# md5sum 1259357004_compare_71f2800001b5_18432_pri.log
d11924aadfe72dd1117f260f8b092caf  1259357004_compare_71f2800001b5_18432_pri.log
[root@localhost logs]# md5sum 1259357004_compare_71f2800001b5_18432_sec.log
620f0b67a91f7f74151bc5be745b7110  1259357004_compare_71f2800001b5_18432_sec.log

Comando antigo

 scli --enable_background_device_scanner
Error: Either a valid Storage Pool ID or name must be specified

Usage: scli --enable_background_device_scanner (((--protection_domain_id  | --protection_domain_name ) --storage_pool_name ) | --storage_pool_id ) --scanner_mode  [--scanner_bandwidth_limit ] [--report_and_fix | --report_only]
Description: Enable background device scanner
Parameters:
    --protection_domain_id          Protection Domain ID
    --protection_domain_name      Protection Domain name
    --storage_pool_name           Storage Pool name
    --storage_pool_id               Storage Pool ID
    --scanner_mode                Scanner mode of operation where MODE can be one of the following:
                                        device_only - Perform read operations. Fix from peer on errors
                                        data_comparison - Perform the device_only test and compare the data content with peer. Not supported for fine granularity Storage Pools
    --scanner_bandwidth_limit           Bandwidth limit in KB per second per device. The given value should be between 10KB and 10MB. The default value is 3MB
    --report_and_fix                    Report errors and automatically fix them (default)
    --report_only                       Report errors without fixing them

Novo comando

 Usage: scli --enable_background_device_scanner (((--protection_domain_id  | --protection_domain_name ) --storage_pool_name ) | --storage_pool_id ) --read_error_action  --compare_error_action  [--scanner_bandwidth_limit ]
Description: Enable background device scanner
Parameters:
    --protection_domain_id          Protection Domain ID
    --protection_domain_name      Protection Domain name
    --storage_pool_name           Storage Pool name
    --storage_pool_id               Storage Pool ID
    --read_error_action         Read error handling. Can be one of the following:
                                        report_and_fix - Perform read operations and automatically fix from peer on errors
                                        report_only    - Perform read operations and report errors without fixing them
    --compare_error_action      Compare error handling. Can be one of the following:
                                        no_compare     - Perform read operations without comparing data content with peer
                                        report_and_fix - Perform read operations, compare data content with peer, and automatically fix
                                                         Not supported for fine granularity Storage Pools
                                        report_only    - Perform read operations, compare data content with peer, and report mismatches without fixing them
                                                         Not supported for fine granularity Storage Pools
    --scanner_bandwidth_limit           Bandwidth limit in KB per second per device. The given value should be between 10KB and 10MB. The default value is 3MB