块设备层将请求发往SCSI层,SCSI就开始真实处理这些IO请求,但是SCSI层又对其内部按照功能划分了不同层次: * SCSI高层:高层驱动负责管理disk,接收块设备层发出的IO请求,打包成SCSI层可识别的命令格式,继续往下发; *SCSI中层:中层负责通用功能,如错误处理,超时重试等; * SCSI低层:底层负责识别物理设备,将其抽象提供给...
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME prometheu 1705 root mem REG 8,17 72567556 234356807 /disk2/prometheus_dir/data/01G2J2YMJPY9HXMP5KSPW30MM1/chunks/000001 prometheu 1705 root mem REG 8,17 73620431 234356815 /disk2/prometheus_dir/data/01G19H692F7JN796CBQDSFVV1W/chunks/0...
复制 $ iotopTotal DISK READ :0.00 B/s | Total DISK WRITE :7.85 K/s Actual DISK READ:0.00 B/s | Actual DISK WRITE:0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND15055be/3 root0.00 B/s7.85 K/s0.00 %0.00 % systemd-journald 1. 2. 3. 4. 5. 从该输出可以看到,...
$ iotop Total DISK READ : 0.00 B/s | Total DISK WRITE : 7.85 K/s Actual DISK READ: 0.00 B/s | Actual DISK WRITE: 0.00 B/s TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND 15055 be/3 root 0.00 B/s 7.85 K/s 0.00 % 0.00 % systemd-journald 从该输出可以看到,前两行分别...
In Chapter 3, we discussed some of the top-level disk devices that the kernel makes available. In this chapter, we’ll discuss in detail how to work with disks on a Linux system. You’ll learn how to partition disks, create and maintain the filesystems that go inside disk partitions, ...
o Backup information for use by the dump command. You should always use a 0 in this field.o The filesystem integrity test order. To ensure that fsck always runs on the root first, always set this to 1 for the root filesystem and 2 for any other filesystems on a hard disk. Use 0...
指标4:磁盘活动时间百分比(Utilization) 磁盘处于活动时间的百分比,即磁盘利用率,磁盘在数据传输和处理命令(如寻道)处于活动状态。磁盘利用率与资源争用程度成正比,与性能成反比。也就是说磁盘利用率越高,资源争用就越严重,性能也就越差,响应时间就越长。一般来说,如果磁盘利用率超过 70%,应用进程将花费较长的时...
PID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND 737183 be/4 root 3.84 K/s 0.00 B/s 0.00 % 88.89 % [kworker/u256:1+flush-8:0] 761496 be/4 work 0.00 B/s 138.96 M/s 0.00 % 79.09 % stress -d 1 876 be/4 work 0.00 B/s 7.68 K/s 0.00 % 0.00 % java -Xms256m -Xmx...
o Backup information for use by the dump command. You should always use a 0 in this field. o The filesystem integrity test order. To ensure that fsck always runs on the root first, always set this to 1 for the root filesystem and 2 for any other filesystems on a hard disk. Use ...
PID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND 737183 be/4 root 3.84 K/s 0.00 B/s 0.00 % 88.89 % [kworker/u256:1+flush-8:0] 761496 be/4 work 0.00 B/s 138.96 M/s 0.00 % 79.09 % stress -d 1 876 be/4 work 0.00 B/s 7.68 K/s 0.00 % 0.00 % java -Xms256m -Xmx...