Model : DL980 G7
OS : SLES 11.2
Symptom : OS Event log - messages에 아래와 유사 메시지가 기록됨
cmaeventd[]: Surface Analysis Pass Information, LDrv=0 Number of passes=501
cmaeventd[]: Surface Analysis Pass Information, LDrv=0 Number of passes=506
Analysis :
해당 볼륨에 대하여, 무결성 검사가 정상 종료 되었음을 알리는 정보성 메시지
SA의 Data 안정성 유지 기능 중 하나로, Dynamic sector repair라는 기능이 있으며,
해당 기능에 의해, 볼륨 유휴 시간을 이용하여, Disk를 Scan하는 서비스가 백그라운드로 돌고 있다.
ADU Report
Consolidated Error Report: No Error
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[Smart Array P410i in Embedded Slot] → Surface Status |
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Surface Analysis Status |
Logical drive 1: Complete. |
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Surface Analysis Pass Count |
Logical drive 1: 508. |
[Smart Array P812 in slot 6] → Surface Status | |
Surface Analysis Status | Logical drive 1: Complete. RAID 4,5,or 5+1. |
Surface Analysis Pass Count | Logical drive 1: 30. |
[Smart Array P812 in slot 9] → Surface Status | |
Surface Analysis Status | Logical drive 1: Complete. RAID 4,5,or 5+1. |
Surface Analysis Pass Count | Logical drive 1: 29. |
같은 장비라고 하더라도, 볼륨의 사용 빈도에 따라, Surface Analysis Scan이 수행되지 않을 수 있다.
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Dynamic sector repair
Disk drive media can develop defects caused by variances in the drive mechanisms under normal operating conditions. To protect data from media defects, HP built a dynamic sector repair feature into Smart Array controllers.
Smart Array controllers perform a background surface analysis during inactive periods, continually scanning all drives for media defects. Smart Array controllers can also detect media defects when accessing a bad sector during busy periods. If a Smart Array controller finds a recoverable media defect, the controller automatically remaps the bad sector to a reserve area on the disk drive. If the controller finds an unrecoverable media defect and you have configured a fault-tolerant logical drive, the controller automatically regenerates the data and writes it to the remapped reserved area on the disk drive.
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Surface scan analysis is an automatic background process that ensures that you can recover data if a drive failure occurs. The scanning process checks physical drives in fault-tolerant logical drives for bad sectors, and in RAID 5 or RAID 6 (ADG) configurations, it also verifies the consistency of parity data.
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this feature works during inactive periods, in a server with very high disk activity the surface scan may not run as frequently as needed to prevent the disk verification
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