1 lsblk
[root@localhost]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 1.1T 0 disk ├─sda1 8:1 0 1G 0 part /boot ├─sda2 8:2 0 100G 0 part / ├─sda3 8:3 0 450G 0 part /backup ├─sda4 8:4 0 1K 0 part ├─sda5 8:5 0 100G 0 part /u00 ├─sda6 8:6 0 100G 0 part /var ├─sda7 8:7 0 50G 0 part /tmp └─sda8 8:8 0 315.7G 0 part /logs sdc 8:32 0 893.1G 0 disk └─sdc1 8:33 0 893.1G 0 part /data1 sdb 8:16 0 893.1G 0 disk sde 8:64 0 893.1G 0 disk ├─sde1 8:65 0 450G 0 part /data3 └─sde2 8:66 0 443.1G 0 part /commitlog sdd 8:48 0 893.1G 0 disk └─sdd1 8:49 0 893.1G 0 part /data2
2 smartctl
[root@localhost ~]# smartctl -a /dev/sda smartctl 5.43 2016-09-28 r4347 [x86_64-linux-2.6.32-754.9.1.el6.x86_64] (local build) Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net Vendor: Cisco Product: UCSC-MRAID12G Revision: 4.62 User Capacity: 1,198,999,470,080 bytes [1.19 TB] Logical block size: 512 bytes Logical Unit id: 0x6f80bcbeac41d2a023eec6c514c1ceb3 Serial number: 00b3cec114c5c6ee23a0d241acbebc80 Device type: disk Local Time is: Fri Mar 1 02:47:43 2019 GMT Device does not support SMART
3 iostat -x -p -t
-t 显示时间戳
-p 会把dev0-8之类转化为sda1.
sdc 0.00 40.23 0.99 2.12 144.29 338.80 155.52 0.02 7.68 0.36 11.09 0.21 0.06 sdc1 0.00 40.23 0.99 2.12 144.29 338.80 155.52 0.02 7.68 0.36 11.09 0.21 0.06 sdb 0.00 0.00 0.00 0.00 0.00 0.00 24.89 0.00 0.14 0.14 0.00 0.14 0.00 sde 0.00 80.05 0.20 2.97 16.89 664.23 214.30 0.02 7.20 0.39 7.66 0.34 0.11 sde1 0.00 19.64 0.20 1.03 16.88 165.34 147.84 0.01 9.42 0.38 11.21 0.22 0.03 sde2 0.00 60.42 0.00 1.95 0.00 498.89 256.40 0.01 5.79 3.80 5.79 0.42 0.08 sdd 0.00 38.47 1.80 2.01 237.10 323.88 147.09 0.02 5.95 0.35 10.95 0.20 0.07 sdd1 0.00 38.47 1.80 2.01 237.10 323.88 147.09 0.02 5.95 0.35 10.95 0.20 0.07
4 查看分区类型
[root@host ~]# cat /etc/fstab
UUID=74d82177-9ffd-4564-94d6-fc97cfdda575 / ext4 defaults 1 1
UUID=b6d58e19-7800-4284-96ae-615744a40f9d /backup ext4 defaults 1 2
UUID=465299be-d033-4e52-9359-125face600fc /boot ext2 defaults 1 2
UUID=cf442cbb-f33a-444d-be16-ae82a54a1802 /commitlog ext4 noatime 1 2
UUID=26c93b16-ce00-4f75-a17f-b56f7dcbd8ba /data1 ext4 noatime 1 2
UUID=65166b86-d9ac-41a8-be07-95c1e1d5e8d0 /data2 ext4 noatime 1 2
UUID=f1533b88-c494-41eb-8407-3951b5999486 /data3 ext4 noatime 1 2
UUID=c897ac33-7170-42d6-85c9-2d599e22dda0 /logs ext4 defaults 1 2
UUID=4cfed02e-31ea-4d09-970c-f906e3cc1c8a /tmp ext4 defaults 1 2
UUID=fbb944ee-6b21-4571-b1d8-2cc37e47538c /u00 ext4 defaults 1 2
UUID=fa2c170d-71b1-4707-a692-8a12c4d83706 /var ext4 defaults 1 2
5 pidstat
[root@host~]# pidstat -d 1 Linux 2.6.32-504.1.3.el6.x86_64 (tagrdbca01) 04/04/2019 _x86_64_ (32 CPU) 06:05:00 AM PID kB_rd/s kB_wr/s kB_ccwr/s Command 06:05:01 AM 1373 7384.62 0.00 0.00 rsync 06:05:01 AM 1375 0.00 11911.54 0.00 rsync 06:05:01 AM 1557 0.00 96.15 0.00 jbd2/sdd1-8 06:05:01 AM 4907 0.00 7.69 0.00 rsync 06:05:01 AM 5156 0.00 7.69 0.00 rsync 06:05:01 AM 18653 584.62 176.92 0.00 java 06:05:01 AM 19594 0.00 11.54 0.00 rsync
6 io information
cd /sys/class/block/sdb/queue [root@hostqueue]# ll total 0 -rw-r--r-- 1 root root 4096 Apr 4 07:57 add_random -r--r--r-- 1 root root 4096 Apr 4 07:00 discard_granularity -r--r--r-- 1 root root 4096 Apr 4 07:57 discard_max_bytes -r--r--r-- 1 root root 4096 Apr 4 07:57 discard_zeroes_data -r--r--r-- 1 root root 4096 Apr 4 07:57 hw_sector_size drwxr-xr-x 2 root root 0 Apr 4 07:57 iosched -rw-r--r-- 1 root root 4096 Apr 4 07:57 iostats -r--r--r-- 1 root root 4096 Apr 4 07:00 logical_block_size -r--r--r-- 1 root root 4096 Apr 4 07:57 max_hw_sectors_kb -rw-r--r-- 1 root root 4096 Apr 4 07:57 max_sectors_kb -r--r--r-- 1 root root 4096 Apr 4 07:57 max_segments -r--r--r-- 1 root root 4096 Apr 4 07:57 max_segment_size -r--r--r-- 1 root root 4096 Apr 4 07:57 minimum_io_size -rw-r--r-- 1 root root 4096 Apr 4 07:57 nomerges -rw-r--r-- 1 root root 4096 Apr 4 07:57 nr_requests -r--r--r-- 1 root root 4096 Apr 4 07:57 optimal_io_size -r--r--r-- 1 root root 4096 Apr 4 07:57 physical_block_size -rw-r--r-- 1 root root 4096 Aug 21 2018 read_ahead_kb -rw-r--r-- 1 root root 4096 Aug 21 2018 rotational -rw-r--r-- 1 root root 4096 Apr 4 07:57 rq_affinity -rw-r--r-- 1 root root 4096 Aug 21 2018 scheduler -rw-r--r-- 1 root root 4096 Apr 4 07:57 unpriv_sgio
7 修改io schedule
sudo echo noop > /sys/block/hda/queue/scheduler
Set the IO scheduler to either deadline or noop:
The noop scheduler is the right choice when the target block device is an array of SSDs behind a high-end IO controller that performs IO optimization.
The deadline scheduler optimizes requests to minimize IO latency. If in doubt, use the deadline scheduler.
