分类目录归档：Linux

ext4 lvm在线扩容

发表于 2021 年 5 月 31 日 由 惜分飞

文件系统格式

[root@xifenfei~]# uname -a
Linux datacenter 4.1.12-61.1.28.el6uek.x86_64 #2 SMP Thu Feb 23 20:03:53 PST 2017 x86_64 x86_64 x86_64 GNU/Linux
[root@xifenfei~]# mount
/dev/mapper/vg_datacenter-lv_root on / type ext4 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
tmpfs on /dev/shm type tmpfs (rw)
/dev/sda1 on /boot type ext4 (rw)
/dev/mapper/vg_datacenter-lv_home on /home type ext4 (rw)
/dev/mapper/vg_datacenter-lvu01 on /u01 type ext4 (rw)
/dev/sdb1 on /oracle_data type ext4 (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
[root@datacenter ~]#

linux扫描新磁盘

[root@xifenfei ~]#  ls /sys/class/scsi_host/
host0  host1  host2
[root@xifenfei ~]# echo '- - -'  > /sys/class/scsi_host/host0/scan
[root@xifenfei ~]# echo '- - -'  > /sys/class/scsi_host/host1/scan
[root@xifenfei ~]# echo '- - -'  > /sys/class/scsi_host/host2/scan

vg扩容

[root@xifenfei ~]# pvcreate /dev/sdc1
  Physical volume "/dev/sdc1" successfully created
[root@xifenfei ~]# vgs
  VG            #PV #LV #SN Attr   VSize   VFree  
  vg_xifenfei   1   4   0 wz--n- 499.51g 584.00m
[root@xifenfei ~]# vgextend vg_xifenfei /dev/sdc1
  Volume group "vg_xifenfei" successfully extended
[root@xifenfei ~]# vgs
  VG            #PV #LV #SN Attr   VSize   VFree  
  vg_xifenfei   2   4   0 wz--n- 999.50g 500.56g

lv进行扩容

[root@xifenfei ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_xifenfei-lv_root
                       50G  6.4G   41G  14% /
tmpfs                  63G     0   63G   0% /dev/shm
/dev/sda1             477M   84M  364M  19% /boot
/dev/mapper/vg_xifenfei-lv_home
                      1.9G   29M  1.8G   2% /home
/dev/mapper/vg_xifenfei-lvu01
                      436G  335G   80G  81% /u01
/dev/sdb1             985G  462G  473G  50% /oracle_data
[root@xifenfei ~]# lvresize -L +500G /dev/mapper/vg_xifenfei-lvu01
  Size of logical volume vg_xifenfei/lvu01 changed from 443.00 GiB (113408 extents) to 943.00 GiB (241408 extents).
  Logical volume lvu01 successfully resized.
[root@xifenfei ~]# resize2fs /dev/mapper/vg_xifenfei-lvu01
resize2fs 1.43-WIP (20-Jun-2013)
Filesystem at /dev/mapper/vg_xifenfei-lvu01 is mounted on /u01; on-line resizing required
old_desc_blocks = 28, new_desc_blocks = 59
The filesystem on /dev/mapper/vg_xifenfei-lvu01 is now 247201792 blocks long.

[root@xifenfei ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_xifenfei-lv_root
                       50G  6.4G   41G  14% /
tmpfs                  63G     0   63G   0% /dev/shm
/dev/sda1             477M   84M  364M  19% /boot
/dev/mapper/vg_xifenfei-lv_home
                      1.9G   29M  1.8G   2% /home
/dev/mapper/vg_xifenfei-lvu01
                      929G  335G  552G  38% /u01
/dev/sdb1             985G  462G  473G  50% /oracle_data
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-bash: /bin/rm: Argument list too long

发表于 2021 年 1 月 5 日 由 惜分飞

linux批量删除大量文件,当使用rm -rf *报-bash: /bin/rm: Argument list too long错误可以使用find+xargs搞定

[grid@xifenfei audit]$ rm -rf +ASM2_ora_1*_2017*.aud
-bash: /bin/rm: Argument list too long
[grid@xifenfei audit]$ ls|wc -l
111650450
[grid@xifenfei audit]$ find ./ -name "*.aud" |xargs rm -r
[grid@xifenfei audit]$ ls
[grid@xifenfei audit]$
发表在 Linux | 2 条评论

Using mlock ulimits for SHM_HUGETLB is deprecated

发表于 2018 年 3 月 11 日 由 惜分飞

Oracle 数据库运行在linux 6中,启用大页之后,我们经常在/var/log/messages里面会看到类似这样的记录:Mar 11 12:12:33 i-q2ghx82t kernel: oracle (3677): Using mlock ulimits for SHM_HUGETLB is deprecated,我这里的环境也有重现该问题
环境说明

--系统配置
[root@i-q2ghx82t ~]# more /etc/issue
CentOS release 6.8 (Final)
Kernel \r on an \m

[root@i-q2ghx82t ~]# ulimit  -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
scheduling priority             (-e) 0
file size               (blocks, -f) unlimited
pending signals                 (-i) 128331
max locked memory       (kbytes, -l) 64
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
real-time priority              (-r) 0
stack size              (kbytes, -s) 10240
cpu time               (seconds, -t) unlimited
max user processes              (-u) 128331
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited

[oracle@i-q2ghx82t ~]$ cat /proc/meminfo|grep Hu
AnonHugePages:         0 kB
HugePages_Total:   10752
HugePages_Free:    10752
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB

[root@i-q2ghx82t ~]# more  /proc/sys/vm/hugetlb_shm_group
0

[root@i-q2ghx82t ~]# id oracle
uid=1000(oracle) gid=1000(oinstall) groups=1000(oinstall),1001(dba),1002(oper),1005(asmdba)

--数据库参数
use_large_pages=only

在本环境中数据库启动正常,大页也可以正常使用,但是在系统日志中有类似Mar 11 12:12:33 i-q2ghx82t kernel: oracle (3677): Using mlock ulimits for SHM_HUGETLB is deprecated 这样的告警.通过分析,是由于少配置了hugetlb_shm_group参数导致(vm.hugetlb_shm_group 参数设置为有权使用 HugePages 的操作系统组。默认情况下，此参数设置为 0，从而允许所有组使用 HugePages。可以将此参数设置为 Oracle 数据库进程所属的操作系统组，如 oinstall),在本系统中在sysctl.conf中增加vm.hugetlb_shm_group=1000,然后重启系统(测试中,如果只是重启数据库,非系统重启后第一次重启数据库,不会出现该告警),系统日志没有出现相关告警.
在Linux 6中配置大页建议加上对应的hugetlb_shm_group参数

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