Ptbus disk-mon daemon

Magicloud

Daemon相关知识了解

• Daemon Definition
• Creating a daemon in Linux
• Unix Daemon Server Programming
• Linux Daemon Writing HOWTO
• 守护进程详解及创建，daemon()使用

MCS3DiskMonitor Daemon使用

1. pid文件路径： /var/run/mcs3-smart-monitor.pid
2. daemon所在位置: /etc/init.d/
3. log打印位置：/var/log/mccloudstor/mcs3-disk-mon.log

4. 操作方式：

   • service mcs3-smart-monitor start
   • service mcs3-smart-monitor stop
   • service mcs3-smart-monitor restart

改动daemon相关代码，需restart daemon才可以生效

MCS3DiskMonitor Daemon process

1. 单位时间避免邮件重复发送： 通过声明一个全局变量send_email_time, 记录当前时间的一个小时的时间，一旦发送邮件立即更新该变量为当前时间

sent_mail_time = datetime.datetime.now() - datetime.timedelta(0,3600) # 1 hour
def send_disk_status_notification(disk_status):
    global sent_mail_time
    now = datetime.datetime.now()
    if now < sent_mail_time + datetime.timedelta(0,3600):
        logger.info("Notification sent within one hour before. System will not send again.")
        return
            host = socket.gethostname()
    title = "Host {} Disk Health Status Warning!".format(host)
    message = disk_status
    try:
        utils.send_notification(title, message)
        sent_mail_time = datetime.datetime.now()
    except Exception as e:
        logger.error(str(e))

2. 执行命令报错影响其他代码的执行，有以下几处命令执行：

line48:

output = utils.do_cmd("zpool status|grep state", force=True)

line71~75

    VDSTATE1 = do_cmd(MEGACLI_BIN + " -cfgdsply -aALL -NoLog | grep State") 
    VDSTATE2 = do_cmd(MEGACLI_BIN + " -AdpAllInfo -aALL -NoLog | grep Degraded")
    VDSTATE3 = do_cmd(MEGACLI_BIN + " -AdpAllInfo -aALL -NoLog | grep Offline")
    PDSTATE1 = do_cmd(MEGACLI_BIN + " -AdpAllInfo -aALL -NoLog | grep \"Critical Disks\"")
    PDSTATE2 = do_cmd(MEGACLI_BIN + " -AdpAllInfo -aALL -NoLog | grep \"Failed Disks\"")

暂时处理方法：在这些方法的外面单独包一层try catch

3. SSD Disk信息获取

• 获取健康寿命

smartctl -a -d megaraid,{} {}|grep 'Media_Wearout_Indicator'

• 获取磁盘序列号

smartctl -a -d megaraid,{} {}|grep 'Serial Number'

• 判断是否为SSD Disk：如果为1则为机械硬盘，如果为0则为SSD Disk

cat /sys/block/{}/queue/rotational  // param such as sda or sdb etc