Test disk usage in Ceph environment when writing to the cache drive

Test disk usage in Ceph environment when writing to the cache drive

[Email protected] ~]# lsblk

NAME maj:min RM SIZE RO TYPE mountpoint

Sr0 11:0 1 1024M 0 rom

SDB 8:16 0 20G 0 disk

└─cachedev-0 (dm-4) 253:4 0 20G 0 dm/sandstone-data/sds-0

SDA 8:0 0 50G 0 disk

├─SDA1 8:1 0 500M 0 part/boot

└─sda2 8:2 0 49.5G 0 part

├─volgroup-lv_root (dm-0) 253:0 0 45.6G 0 LVM/

└─volgroup-lv_swap (dm-1) 253:1 0 3.9G 0 LVM [swap]

SDC 8:32 0 20G 0 disk

├─vg_mix-lv_journal_0_0 (dm-2) 253:2 0 8G 0 LVM

└─vg_mix-lv_cache_0_0 (dm-3) 253:3 0 12G 0 LVM

└─cachedev-0 (dm-4) 253:4 0 20G 0 dm/sandstone-data/sds-0

SDD 8:48 0 10G 0 disk

SDE 8:64 0 10G 0 disk

SDF 8:80 0 10G 0 disk

[Email protected] ~]#

First Shell:

[[email protected] ~]# dd If=/dev/zero OF=/DEV/SDD bs=1m count=1000

A second shell:

[Email protected] ~]# IOSTAT-DXT 1

Linux 2.6.32-358.11.1.2.ky3.1.x86_64 (localhost.localdomain) October 23, 2017 _x86_64_(4 CPU)

October 23, 2017 18:27 31 seconds

device:rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await SVCTM%util

SDB 0.01 5.12 0.05 1.59 0.47 53.67 33.11 0.03 19.76 7.90 1.29

SDA 0.06 46.33 1.28 44.61 24.24 727.82 16.39 5.33 116.08 1.70 7.81

SDC 0.76 1.20 5.25 4.24 54.36 67.44 12.83 0.10 10.14 4.70 4.46

dm-0 0.00 0.00 0.22 90.94 13.70 727.82 8.13 7.03 77.15 0.84 7.65

Dm-1 0.00 0.00 0.00 0.00 0.01 0.00 8.00 0.00 7.87 2.71 0.00

Dm-2 0.00 0.00 0.19 1.87 1.51 38.52 19.47 0.03 14.93 8.38 1.72

Dm-3 0.00 0.00 1.00 3.48 8.03 28.18 8.08 0.14 30.85 4.76 2.13

Dm-4 0.00 0.00 0.08 8.54 0.67 68.34 8.00 1.72 199.06 3.18 2.74

SDD 0.00 1.35 0.00 0.01 0.01 10.33 894.49 0.08 6452.67 34.39 0.04

SDE 0.00 0.00 0.00 0.00 0.01 0.00 8.00 0.00 2.74 2.74 0.00

SDF 0.00 0.00 0.00 0.00 0.01 0.00 8.00 0.00 2.74 2.74 0.00

October 23, 2017 18:27 32 seconds

device:rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await SVCTM%util

SDB 0.00 595.00 0.00 13.00 0.00 7384.00 568.00 0.88 139.38 22.85 29.70

SDA 0.00 12.00 10.00 1012.00 88.00 8152.00 8.06 144.63 93.69 0.98 100.00

SDC 0.00 69.00 5.00 16.00 544.00 7376.00 377.14 36.40 563.48 47.62 100.00

dm-0 0.00 0.00 2.00 1004.00 16.00 8032.00 8.00 147.08 95.42 0.99 100.00

Dm-1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

Dm-2 0.00 0.00 0.00 19.00 0.00 8584.00 451.79 9.95 379.74 52.37 99.50

Dm-3 0.00 0.00 2.00 69.00 16.00 552.00 8.00 927.73 2342.27 14.08 100.00

Dm-4 0.00 0.00 2.00 606.00 16.00 4848.00 8.00 1195.77 439.58 1.64 100.00

SDD 0.00 3937.00 0.00 16.00 0.00 15368.00 960.50 143.73 5219.94 62.50 100.00

SDE 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

SDF 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00

The environment is a ceph environment. SDC acts as a cache disk for journal and cache.

The following is information about the block of a virtual disk:

[Email protected] ~]# smartctl-a/DEV/SDC

Smartctl 5.43 2012-06-30 r3573 [x86_64-linux-2.6.32-358.11.1.2.ky3.1.x86_64] (local build)

Copyright (C) 2002-12 by Bruce Allen, http://smartmontools.sourceforge.net

Vendor:vmware

Product:virtual disk

revision:1.0

User capacity:21,474,836,480 bytes [21.4 GB]

Logical block size:512 bytes

Logical Unit id:0x6000c29586aa7f7d928e86417eb5e2ff

Serial number:6000c29586aa7f7d928e86417eb5e2ff

Device Type:disk

Local time Is:mon Oct 18:30:39 CST

Device does not support SMART

Error Counter Logging not supported

Device does not support self Test logging

This article is from the "Ching, you share" blog, please be sure to keep this source http://chenxiaotao.blog.51cto.com/11430805/1975321

Test disk usage in Ceph environment when writing to the cache drive