If input/output error is indicated by a system log of EC2 server as show below:-
[9943662.053217] end_request: I/O error, dev sde, sector 52428288
[9943664.191262] end_request: I/O error, dev sde, sector 52428168
[9943664.191285] Buffer I/O error on device md0, logical block 209713024
[9943664.191297] Buffer I/O error on device md0, logical block 209713025 [9943664.191304] Buffer I/O error on device md0, logical block 209713026 [9943664.191310] Buffer I/O error on device md0, logical block 209713027 [9943664.191317] Buffer I/O error on device md0, logical block 209713028 [9943664.191324] Buffer I/O error on device md0, logical block 209713029 [9943664.191332] Buffer I/O error on device md0, logical block 209713030 [9943664.191339] Buffer I/O error on device md0, logical block 209713031 [9943664.191581] end_request: I/O error, dev sde, sector 52428280 [9943664.191590] Buffer I/O error on device md0, logical block 209713136 [9943664.191597] Buffer I/O error on device md0, logical block 209713137 [9943664.191767] end_request: I/O error, dev sde, sector 52428288 [9943664.191970] end_request: I/O error, dev sde, sector 52428288 [9943664.192143] end_request: I/O error, dev sde, sector 52428288 [9943664.192949] end_request: I/O error, dev sde, sector 52428288 [9943664.193112] end_request: I/O error, dev sde, sector 52428288 [9943664.193266] end_request: I/O error, dev sde, sector 52428288 ...
Root Caused :-
If our server is Amazon EBS-backed :- A failed Amazon EBS volume
If our server is Instance store-backed :- A failed physical drive
Solution:-
Amazon EBS-backed server:-
1. Stop the instance.
2. Detach the volume.
3. Attempt to recover the volume.
Take snapshot of volume ----> Then create new volume from snapshot in same AZ.
Note It's good practice to snapshot your Amazon EBS volumes often. This dramatically decreases the risk of data loss as a result of failure.
4. Re-attach the volume
Instance store-backed Server:-
Terminate the instance and launch a new instance.
Note:- Data cannot be recovered. if you kept any backups then only you can Recover from backups.
It's a good practice to use either Amazon S3 or Amazon EBS for backups.
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