http://www.howopensource.com/2015/02/how-to-install-and-use-amazon-glacier-on-linux/
HP 6730B Fan Control After Resume
modifed from http://computertinker.blogspot.ca/2013/11/fixing-fan-speed-on-hp-6730b-laptop.html
# cat /usr/lib/systemd/system-sleep/99fancontrol.sh
#!/bin/sh
case "$1" in
pre)
# Stopping is not required.
;;
post)
# In background.
ls /sys/devices/virtual/thermal/cooling_device*/cur_state | while read A; do echo 1 > $A; echo 0 > $A; done
;;
*) exit $NA
;;
esac
dmvpn
https://supportforums.cisco.com/document/115356/dmvpn-spoke-troubleshooting-order-and-component-responsibilities
http://www.cisco.com/c/en/us/support/docs/security-vpn/dynamic-multi-point-vpn-dmvpn/116957-technote-dmvpn-00.html
http://stor.balios.net/Live2011/BRKSEC-3012_10_a6-rev2.pdf
smartd
http://www.linuxjournal.com/content/know-when-your-drives-are-failing-smartd
# service smartd restart Redirecting to /bin/systemctl restart smartd.service # WARNING: Your hard drive is failing Device: /dev/sdc [USB Sunplus], 1 Currently unreadable (pending) sectors WARNING: Your hard drive is failing Device: /dev/sdc [USB Sunplus], 1 Offline uncorrectable sectors # smartctl -A /dev/sdc smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-229.20.1.el7.x86_64] (local build) Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF READ SMART DATA SECTION === SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000f 200 200 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0003 239 190 021 Pre-fail Always - 3041 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 555 5 Reallocated_Sector_Ct 0x0033 196 196 140 Pre-fail Always - 25 7 Seek_Error_Rate 0x000f 200 200 051 Pre-fail Always - 0 9 Power_On_Hours 0x0032 038 038 000 Old_age Always - 45770 10 Spin_Retry_Count 0x0013 100 100 051 Pre-fail Always - 0 11 Calibration_Retry_Count 0x0012 100 100 051 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 550 190 Airflow_Temperature_Cel 0x0022 057 030 045 Old_age Always In_the_past 43 194 Temperature_Celsius 0x0022 107 080 000 Old_age Always - 43 196 Reallocated_Event_Count 0x0032 199 199 000 Old_age Always - 1 197 Current_Pending_Sector 0x0012 200 200 000 Old_age Always - 1 198 Offline_Uncorrectable 0x0010 200 200 000 Old_age Offline - 1 199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0009 200 200 051 Pre-fail Offline - 0 [root@hp-server ~]# smartctl -l error /dev/sdc smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.10.0-229.20.1.el7.x86_64] (local build) Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF READ SMART DATA SECTION === SMART Error Log Version: 1 ATA Error Count: 8073 (device log contains only the most recent five errors) CR = Command Register [HEX] FR = Features Register [HEX] SC = Sector Count Register [HEX] SN = Sector Number Register [HEX] CL = Cylinder Low Register [HEX] CH = Cylinder High Register [HEX] DH = Device/Head Register [HEX] DC = Device Command Register [HEX] ER = Error register [HEX] ST = Status register [HEX] Powered_Up_Time is measured from power on, and printed as DDd+hh:mm:SS.sss where DD=days, hh=hours, mm=minutes, SS=sec, and sss=millisec. It "wraps" after 49.710 days. Error 8073 occurred at disk power-on lifetime: 45761 hours (1906 days + 17 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 51 ff 5f 65 74 40 Error: UNC at LBA = 0x0074655f = 7628127 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 40 08 5f 65 74 00 00 01:12:54.018 READ FPDMA QUEUED 61 20 08 6f 38 f4 01 00 01:12:54.018 WRITE FPDMA QUEUED 60 20 08 af 2e 73 00 00 01:12:54.006 READ FPDMA QUEUED 61 80 08 ef 37 f4 01 00 01:12:54.005 WRITE FPDMA QUEUED 60 80 08 57 6b 47 00 00 01:12:54.004 READ FPDMA QUEUED Error 8072 occurred at disk power-on lifetime: 45761 hours (1906 days + 17 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 51 ff d7 5e 86 40 Error: UNC at LBA = 0x00865ed7 = 8806103 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 80 08 d7 5e 86 00 00 01:12:43.715 READ FPDMA QUEUED 61 68 08 3f 03 f4 01 00 01:12:43.714 WRITE FPDMA QUEUED 60 80 08 df ab 88 00 00 01:12:43.713 READ FPDMA QUEUED 61 80 08 bf 02 f4 01 00 01:12:43.712 WRITE FPDMA QUEUED 60 80 08 5f ab 88 00 00 01:12:43.712 READ FPDMA QUEUED Error 8071 occurred at disk power-on lifetime: 45761 hours (1906 days + 17 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 51 ff 5f 9a 35 40 Error: UNC at LBA = 0x00359a5f = 3512927 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 80 08 5f 9a 35 00 00 01:12:00.714 READ FPDMA QUEUED 61 08 08 7f bd 5e 00 00 01:12:00.713 WRITE FPDMA QUEUED 61 08 08 77 bd 5e 00 00 01:12:00.713 WRITE FPDMA QUEUED 61 80 08 87 1c f3 01 00 01:12:00.699 WRITE FPDMA QUEUED 60 80 08 df 99 35 00 00 01:12:00.698 READ FPDMA QUEUED Error 8070 occurred at disk power-on lifetime: 45761 hours (1906 days + 17 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 51 ff 67 f6 32 40 Error: UNC at LBA = 0x0032f667 = 3339879 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 80 08 67 f6 32 00 00 01:08:00.328 READ FPDMA QUEUED 61 80 08 47 74 f0 01 00 01:08:00.310 WRITE FPDMA QUEUED 60 80 08 e7 f5 32 00 00 01:08:00.310 READ FPDMA QUEUED 61 80 08 c7 73 f0 01 00 01:08:00.309 WRITE FPDMA QUEUED 60 80 08 67 f5 32 00 00 01:08:00.308 READ FPDMA QUEUED Error 8069 occurred at disk power-on lifetime: 45761 hours (1906 days + 17 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER ST SC SN CL CH DH -- -- -- -- -- -- -- 40 51 ff 67 7e 4e 40 Error: UNC at LBA = 0x004e7e67 = 5144167 Commands leading to the command that caused the error were: CR FR SC SN CL CH DH DC Powered_Up_Time Command/Feature_Name -- -- -- -- -- -- -- -- ---------------- -------------------- 60 80 08 67 7e 4e 00 00 01:07:35.101 READ FPDMA QUEUED 61 80 08 3f 05 f0 01 00 01:07:35.000 WRITE FPDMA QUEUED 60 80 08 e7 7d 4e 00 00 01:07:34.999 READ FPDMA QUEUED 61 80 08 bf 04 f0 01 00 01:07:34.999 WRITE FPDMA QUEUED 60 80 08 67 7d 4e 00 00 01:07:34.982 READ FPDMA QUEUEDAnother one
/var/log/messages-20160228:Feb 22 07:44:57 guava smartd[770]: Device: /dev/sda [SAT], 24 Offline uncorrectable sectors /var/log/messages-20160228:Feb 22 08:14:57 guava smartd[770]: Device: /dev/sda [SAT], 24 Currently unreadable (pending) sectors
Performance Tuning
Pagecache
https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/Tuning_and_Optimizing_Red_Hat_Enterprise_Linux_for_Oracle_9i_and_10g_Databases/sect-Oracle_9i_and_10g_Tuning_Guide-Memory_Usage_and_Page_Cache-Tuning_the_Page_Cache.htmlDatabase Tuning
https://www.google.ca/search?q=pagecache+and+database&ie=utf-8&oe=utf-8&gws_rd=cr&ei=PsjLVJK2KIufyQTh74HIDQ#q=linux+pagecache+and+database
Slow Query Due to fragmentation
http://www.psce.com/blog/2012/07/09/data-fragmentation-problem-in-mysql-myisam/
mysql
1. timeout http://www.percona.com/blog/2007/07/08/mysql-net_write_timeout-vs-wait_timeout-and-protocol-notes/
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