搞了 3 台机器在切片，i/o 老是告警。（每台两个 ffmpeg 在切）

磁盘响应时间 https://prnt.sc/sl8yel https://prnt.sc/sl8yho https://prnt.sc/sl8yl0

磁盘响应时间（ iostat ） https://prnt.sc/sl8yqv https://prnt.sc/sl8yvp https://prnt.sc/sl8yzy

SSD 型号：三星 MZ7LN512

[Created at block.245]   Unique ID: 3OOL.FBQqHFuJif1   Parent ID: abAj.GPRb67Bwnc2   SysFS ID: /class/block/sda   SysFS BusID: 1:0:0:0   SysFS Device Link: /devices/pci0000:00/0000:00:17.0/ata2/host1/target1:0:0/1:0:0:0   Hardware Class: disk   Model: "SAMSUNG MZ7LN512"   Vendor: "SAMSUNG"   Device: "MZ7LN512"   Revision: "100Q"   Serial ID: "S2MHxxxxxx"   Driver: "ahci", "sd"   Driver Modules: "ahci"   Device File: /dev/sda   Device Files: /dev/sda, /dev/disk/by-id/ata-SAMSUNG_MZ7LN512HMJP-00000_S2MHNB0J300937, /dev/disk/by-id/wwn-0x5002538d41d70d31, /dev/disk/by-path/pci-0000:00:17.0-ata-2.0   Device Number: block 8:0-8:15   BIOS id: 0x81   Geometry (Logical): CHS 62260/255/63   Size: 1000215216 sectors a 512 bytes   Capacity: 476 GB (512110190592 bytes)   Geometry (BIOS EDD): CHS 992277/16/63   Size (BIOS EDD): 1000215216 sectors   Geometry (BIOS Legacy): CHS 1023/255/63   Config Status: cfg=new, avail=yes, need=no, active=unknown   Attached to: #7 (SATA controller)