Implement advanced storage capabilities
Managing tiered storage with Stratis
Stratis
Local storage management solution for Linux. Designed to provide a more convenient way to perform initial configuration of storage, make modifications to storage configuration, and use advanced storage features.
Stratis runs as a service that manages a pool of physical storage devices and transparently creates and manages volumes for newly created file systems.
Using Stratis Storage
To use the Stratis storage management solution to manage file systems, please install the stratis-cli and stratisd packages.
View block devices
[root@clear ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
vda 252:0 0 10G 0 disk
├─vda1 252:1 0 1M 0 part
├─vda2 252:2 0 100M 0 part /boot/efi
└─vda3 252:3 0 9.9G 0 part /
vdb 252:16 0 10G 0 disk
vdc 252:32 0 10G 0 disk
vdd 252:48 0 10G 0 disk
Install and enable
[root@clear ~]# yum install stratis-cli stratisd -y
[root@clear ~]# systemctl enable --now stratisd
Assemble block storage into a Stratis pool
#创建一个池
[root@clear ~]# stratis pool create pool1 /dev/vdb
Each pool is a subdirectory of the /stratis directory
View the list of available pools
[root@clear ~]# stratis pool list
Name Total Physical
pool1 10 GiB / 37.63 MiB / 9.96 GiB
Add additional block devices to the pool
[root@clear ~]# stratis pool add-data pool1 /dev/vdc
View block devices in the pool
[root@clear ~]# stratis blockdev list pool1
Pool Name Device Node Physical Size Tier
pool1 /dev/vdb 10 GiB Data
pool1 /dev/vdc 10 GiB Data
Managing Stratis file systems
Create a file system for the pool
[root@clear ~]# stratis filesystem create pool1 fs1
Stratis file system link is located /stratis/pool1below
View a list of available file systems
[root@clear ~]# stratis filesystem list
Pool Name Name Used Created Device UUID
pool1 fs1 546 MiB Aug 06 2023 11:50 /stratis/pool1/fs1 649e6e0f7ddd41cd8e7312536d99ee3c
Create a snapshot of the file system
[root@clear ~]# stratis filesystem snapshot pool1 fs1 snapshot1
Persistently mount Stratis file system
To ensure that the Stratis file system is mounted persistently, edit /etc/fstaband specify the file system information.
[root@clear ~]# lsblk --output=UUID /stratis/pool1/fs1
UUID
649e6e0f-7ddd-41cd-8e73-12536d99ee3c
Persistent mount example
[root@clear ~]# cat /etc/fstab | grep stratis
UUID=649e6e0f-7ddd-41cd-8e73-12536d99ee3c /dir1 xfs defaults,x-systemd.requires=stratisd.service 0 0
The x-systemd.requires=stratisd.service option delays mounting until systemd starts stratisd.service during startup.
[root@clear ~]# mkdir /dir1
[root@clear ~]# mount -a
[root@clear ~]# df -h
Filesystem Size Used Avail Use% Mounted on
devtmpfs 887M 0 887M 0% /dev
tmpfs 914M 0 914M 0% /dev/shm
tmpfs 914M 17M 897M 2% /run
tmpfs 914M 0 914M 0% /sys/fs/cgroup
/dev/vda3 9.9G 1.9G 8.1G 19% /
/dev/vda2 100M 6.8M 94M 7% /boot/efi
tmpfs 183M 0 183M 0% /run/user/0
/dev/mapper/stratis-1-5ef6680b3e394818a4338f650e374f0b-thin-fs-649e6e0f7ddd41cd8e7312536d99ee3c 1.0T 7.2G 1017G 1% /dir1
The df command will report the size of any new xfs file system managed by Stratis as 1TiB, regardless of the amount of physical storage currently allocated to the file system.
View actual storage
[root@clear ~]# stratis pool list
Name Total Physical
pool1 20 GiB / 1.11 GiB / 18.89 GiB
Store and deduplicate data using VDO compression
Virtual Data Optimizer
VDO can optimize the space occupied by data on block devices. VDO is a Linux device mapper driver that reduces disk space usage on block devices while minimizing data duplication, thereby saving disk space and even increasing data throughput. VDO kernel module: kvdo is used to control data compression in a transparent manner, and uds is used for deduplication.
VDO sits on top of a block device (RAID or local disk).
Implement data seeking optimizer
Logical devices created using VDO are called VDO volumes. A VDO volume is similar to a disk partition; the volume can be formatted into the required file system and mounted, or the VDO volume can be used as an LVM physical volume.
Enable VDO
#安装VDO和kmod-kvdo软件包
[root@clear ~]# yum install vdo kmod-kvdo -y
Create VDO volume
[root@clear ~]# vdo create --name=vdo1 --device=/dev/vdd --vdoLogicalSize=5G
Creating VDO vdo1
The VDO volume can address 6 GB in 3 data slabs, each 2 GB.
It can grow to address at most 16 TB of physical storage in 8192 slabs.
If a larger maximum size might be needed, use bigger slabs.
Starting VDO vdo1
Starting compression on VDO vdo1
VDO instance 0 volume is ready at /dev/mapper/vdo1
You can format it to the required file system and mount it
Analyze VDO volumes
[root@clear ~]# vdo status --name=vdo1
VDO status:
Date: '2023-08-06 12:45:25-04:00'
Node: clear.domain250.example.com
Kernel module:
Loaded: true
Name: kvdo
Version information:
kvdo version: 6.2.2.117
Configuration:
File: /etc/vdoconf.yml
Last modified: '2023-08-06 12:42:31'
VDOs:
vdo1:
Acknowledgement threads: 1
Activate: enabled
Bio rotation interval: 64
Bio submission threads: 4
Block map cache size: 128M
Block map period: 16380
Block size: 4096
CPU-work threads: 2
Compression: enabled
Configured write policy: auto
Deduplication: enabled
Device mapper status: 0 10485760 vdo /dev/vdd normal - online online 1049638 2621440
...output omitted...