VDO – Virtual Data Optimizer 重复数据删除和压缩存储TRIM信息

清疚 2023-10-08 08:16 31阅读 0赞

Centos安装hdparm  
yum install hdparm -y

\[root@localhost ~\]\# ls -alrt /dev/mapper/vdo0  
lrwxrwxrwx. 1 root root 7 Oct 12 20:02 /dev/mapper/vdo0 -> ../dm-3  
\[root@localhost ~\]\#  
\[root@localhost ~\]\# cat /sys/block/dm-3/queue/discard\_granularity  
4096  
\[root@localhost ~\]\# lsblk --discard  
NAME DISC-ALN DISC-GRAN DISC-MAX DISC-ZERO  
sda 0 0B 0B 0  
tqsda1 0 0B 0B 0  
mqsda2 0 0B 0B 0  
tqcentos-root 0 0B 0B 0  
mqcentos-swap 0 0B 0B 0  
sdb 0 0B 0B 0  
mqvdovg-vdolv 0 0B 0B 0  
mqvdo0 0 4K 4K 1  
sdc 0 0B 0B 0  
mqvdovg-vdolv 0 0B 0B 0  
mqvdo0 0 4K 4K 1  
sr0 0 0B 0B 0  
\[root@localhost ~\]\#  
\[root@localhost ~\]\# hdparm -I /dev/mapper/vdo0 | grep TRIM  
HDIO\_DRIVE\_CMD(identify) failed: Inappropriate ioctl for device  
\[root@localhost ~\]\#

在使用 systemd 的 Linux 发行版中，一般都自带了 fstrim.timer 和 fstrim.service，启用后会定期一周执行一次 fstrim。以下是 CentOS 7 中的 service 文件。  
\# systemctl enable fstrim.timer  
\# systemctl start fstrim.timer

\# cat /usr/lib/systemd/system/fstrim.timer  
\[Unit\]  
Description=Discard unused blocks once a week  
Documentation=man:fstrim

\[Timer\]  
OnCalendar=weekly  
AccuracySec=1h  
Persistent=true

\[Install\]  
WantedBy=multi-user.target

\# cat /usr/lib/systemd/system/fstrim.service  
\[Unit\]  
Description=Discard unused blocks

\[Service\]  
Type=oneshot  
ExecStart=/usr/sbin/fstrim -a