Deploying a vSAN Cluster
Deploying a vSAN Cluster Accept the promiscuous mode. Troubleshooting vSAN data alarm 'vSAN object' ~] esxcli vsan cluster getCluster Information Enabled: true Current Local Time: 2026-10-10T12:44:44Z Local Node UUID: 6ac9f1ee-fefe-7e75-9d9f-005056a9f8db Local Node Type: NORMAL Local Node State: MASTER Local Node Health State: HEALTHY Sub-Cluster Master UUID: 6ac9f1ee-fefe-7e75-9d9f-005056a9f8db Sub-Cluster Backup UUID: 6ac9f1df-0504-d098-6e06-005056a91f59 Sub-Cluster UU...
Disk IO Performance Tool
Disk IO Performance Tool sysbench ・ https://github.com/akopytov/sysbench RHEL/CentOS 6/7/8: # Installing from Binary Packagescurl -s https://packagecloud.io/install/repositories/akopytov/sysbench/script.rpm.sh | sudo bashsudo yum -y install sysbench# Building and Installing From Sourcesudo yum -y install make automake libtool pkgconfig libaio-develwget https://github.com/akopytov/sysbench/archive/refs/heads/master.zipunzip master.zipcd sysbench-master/./autogen.sh./configure --without-mysql...
How to troubleshoot disk I/O performance issues on Linux
How to troubleshoot disk I/O performance issues on Linux dd if=/dev/zero of=/tmp/testfile bs=1M oflag=append,direct ~]$ iostat -x 1avg-cpu: %user %nice %system %iowait %steal %idle 0.75 0.00 2.00 12.00 0.00 85.25Device r/s rkB/s rrqm/s %rrqm r_await rareq-sz w/s wkB/s wrqm/s %wrqm w_await wareq-sz d/s dkB/s drqm/s %drqm d_await dareq-sz f/s f_await aqu-sz %utildm-0 0.00 0.00 0.00 0.00 0.00 ...
Oracle Database Memory Management
Oracle Database Memory Management 名词 全称 管什么 怎么开 AMM Automatic Memory Management SGA + PGA 一起自动调 设 MEMORY_TARGET ASMM Automatic Shared Memory Management 只自动调 SGA 内部组件，PGA 单列 设 SGA_TARGET + PGA_AGGREGATE_TARGET HugePages Linux 大页内存 用 2MB 大页替代 4KB 小页，减少 TLB miss 系统级 vm.nr_hugepages AMM 与 HugePages 不兼容。生产环境（尤其 Linux），选 ASMM + HugePages，别用 AMM。 Automatic Memory Management (AMM) Automatic Shared Memory Management (ASMM) -- 当前内存管理参数SELECT name, value/1024/1024/1024 AS gbFROM v$...
MegaRAID Quick Start Guide
MegaRAID Quick Start Guide Enable JBOD Press CTRL + R enter LSI MegaRAID BIOS Configuration Utility. Fireware Upgrade Use StorCLI to flash the SAS controllers. These tools can be downloaded from the support and download section of www.avagotech.com Command syntax: cd /opt/MegaRAID/storcli/./storcli64 /c0 show./storcli64 /c0 download file=mr3108fw.rom noverchk Troubleshooting Foreign Config Import Error 0x3b 更换 9361-8i 阵列卡时，导入外部配置出现错误。 怀疑是新阵列卡存在旧配置，拔硬盘和 SAS 线缆清除配置后，还是相同报错。 后来换了一块相同...
Configuring Storage Device Path Persistence Using Oracle ASMLIB on RHEL
Configuring Storage Device Path Persistence Using Oracle ASMLIB on RHEL If you configure disks using Oracle ASMLIB, then you must change the disk discovery string to ORCL:. If the diskstring is set to ORCL:, or is left empty (""), then the installer discovers these disks. RHEL 7 Installing and Configuring Oracle ASMLIB Software Install kmod-oracleasm,oracleasm-support,oracleasmlib rpm package. curl -o /soft/kmod-oracleasm-2.0.8-28.el7.x86_64.rpm https://meno.lostyu.qzz.io/assets/res/linux...
Installing Oracle Database 12.2.0.1 RAC on RHEL 7.6
Installing Oracle Database 12.2.0.1 RAC on RHEL 7.6 Operating System: RHEL 7.6 Database Software: LINUX.X64_122010_grid_home.zip, LINUX.X64_122010_db_home.zip Oracle Standalone Cluster Requirements Redundancy Level DATA Disk Group MGMT Disk Group Total Storage External 2 GB 42 GB 45 GB Normal 3 GB 82 GB 60 GB High 4 GB 124 GB 90 GB a. The DATA disk group stores OCR and voting files, and the MGMT disk group stores GIMR and Oracle Clusterware backup files. b. Starting with Ora...
Pagefault out of memory on RHEL 7.6
Pagefault out of memory on RHEL 7.6 RHEL 7.6 3.10.0-957.el7.x86_64 Oracle Database 12.2.0.1 RAC Symptoms [109920.333071] BUG: unable to handle kernel paging request at 0000000000040158[109920.333188] Call Trace:[109920.333194] [<ffffffffad4c27f6>] ? prepare_to_wait+0x56/0x90[109920.333196] [<ffffffffad634ab4>] mem_cgroup_oom_synchronize+0xe4/0x570[109920.333202] [<ffffffffad4d676b>] ? wake_up_q+0x5b/0x80[109920.333204] [<ffffffffad634390>] ? mem_cgroup_charge_c...
Installing QEMU-KVM Pacemaker Corosync Cluster on RHEL 9
Installing QEMU-KVM Pacemaker Corosync Cluster on RHEL 9 RHEL 9.7 pacemaker-2.1.7-5.2.el8_10.x86_64 corosync-3.1.8-1.el8.x86_64 Object Value Node cls01, cls02 Node Public IP 192.168.3.91, 192.168.3.92 Node Private IP 100.100.100.91, 100.100.100.92 Cluster Name vmcluster BusType iSCSI, 192.168.3.112 Shared Disk 1 20GB, data Shared Disk 2 5GB, data Shared Disk 3 1GB, fence_scsi Setting Media ISO YUM Repository ・ Configuring Yum Repositories Installing Cluster Softwa...
Using Parted Command to Expand LVM
Using Parted Command to Expand LVM parted (GNU parted) 3.7 Linux kali 6.19.14+kali-amd64 /dev/sda 60G --> 100G /dev/mapper/kali--vg-root 54G --> 94G Check filesystem and disk. ┌──(kali㉿kali)-[~]└─$ df -hT /Filesystem Type Size Used Avail Use% Mounted on/dev/mapper/kali--vg-root ext4 54G 46G 5.5G 90% /┌──(kali㉿kali)-[~]└─$ sudo fdisk -lGPT PMBR size mismatch (125829119 != 209715199) will be corrected by write.The backup GPT table is not on the end ...