在虚拟机上VM 添加一块共享磁盘方法 支持Oracle 10g RAC
因为原先的ASM共享磁盘容量小,无法装下归档日志和备份文件.所以决定增加一块磁盘.1 在节点1增加一块虚拟磁盘 放在原来的共享目录
因为原先的ASM共享磁盘容量小,无法装下归档日志和备份文件.所以决定增加一块磁盘.
1 在节点1增加一块虚拟磁盘 放在原来的共享目录上 取名为ASM4
选择SCSI 1:5 注意放在SCSI总线1号上面排在其他盘后面,否则容易发生盘符改变
mode=independent->Persistent
2 关闭虚拟机文件,然后用UEDIT打开 Red Hat Enterprise Linux 4.vmx 在文件最后
scsi1:5.fileName = "F:\sharkdisk\asm4.vmdk"
scsi1:5.mode = "independent-persistent"
可以看到成功添加了ASM4
在原来后面的共享磁盘添加一条
disk.locking = "false"
diskLib.dataCacheMaxSize = "0"
diskLib.dataCacheMaxReadAheadSize = "0"
diskLib.DataCacheMinReadAheadSize = "0"
diskLib.dataCachePageSize = "4096"
diskLib.maxUnsyncedWrites = "0"
-- scsi1.sharedBus = "VIRTUAL" 这条其他人添加的共享总线, 本人没有添加这行,也行!
scsi1:0.deviceType = "disk"
scsi1:1.deviceType = "disk"
scsi1:2.deviceType = "disk"
scsi1:3.deviceType = "disk"
scsi1:4.deviceType = "disk"
scsi1:5.deviceType = "disk"
3 节点2 添加已经存在的虚拟磁盘,在编辑机器上,选择磁盘,选择已经存在的磁盘 在共享目录上找到ASM4 并且设置下 SCSI 1:5 和independent=Persistent
4 关闭虚拟机文件,然后用UEDIT打开 Red Hat Enterprise Linux 4.vmx 添加 scsi1:5.deviceType = "disk"
5 启动节点1 切换到ROOT 用户下 fdisk 新磁盘
[root@node1 ~]# fdisk -l
Disk /dev/sdh: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk /dev/sdh doesn't contain a valid partition table
[root@node1 ~]# fdisk /dev/sdh
[root@node1 ~]# fdisk /dev/sdh
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel. Changes will remain in memory only,
until you decide to write them. After that, of course, the previous
content won't be recoverable.
The number of cylinders for this disk is set to 1044.
There is nothing wrong with that, but this is larger than 1024,
and could in certain setups cause problems with:
1) software that runs at boot time (e.g., old versions of LILO)
2) booting and partitioning software from other OSs
(e.g., DOS FDISK, OS/2 FDISK)
Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)
Command (m for help): n --新建分区
Command action
e extended
p primary partition (1-4)
p --主分区
Partition number (1-4): 1 --分区号 1
First cylinder (1-1044, default 1): 1 --从柱面1开始
Last cylinder or +size or +sizeM or +sizeK (1-1044, default 1044): 1044 --到最后1个柱面
Command (m for help): w --保存分区
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@node1 ~]#
[root@node1 ~]# /etc/init.d/Oracleasm createdisk VOL4 /dev/sdh1
Marking disk "VOL4" as an ASM disk: [ OK ]
VOL1
VOL2
VOL3
VOL4
6 启动节点2 分区被发现,同时ASM盘已经被找到了
[root@node2 ~]# fdisk -l
Disk /dev/sdh: 8589 MB, 8589934592 bytes
255 heads, 63 sectors/track, 1044 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sdh1 1 1044 8385898+ 83 Linux
VOL1
VOL2
VOL3
VOL4

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

Full table scanning may be faster in MySQL than using indexes. Specific cases include: 1) the data volume is small; 2) when the query returns a large amount of data; 3) when the index column is not highly selective; 4) when the complex query. By analyzing query plans, optimizing indexes, avoiding over-index and regularly maintaining tables, you can make the best choices in practical applications.

Yes, MySQL can be installed on Windows 7, and although Microsoft has stopped supporting Windows 7, MySQL is still compatible with it. However, the following points should be noted during the installation process: Download the MySQL installer for Windows. Select the appropriate version of MySQL (community or enterprise). Select the appropriate installation directory and character set during the installation process. Set the root user password and keep it properly. Connect to the database for testing. Note the compatibility and security issues on Windows 7, and it is recommended to upgrade to a supported operating system.

InnoDB's full-text search capabilities are very powerful, which can significantly improve database query efficiency and ability to process large amounts of text data. 1) InnoDB implements full-text search through inverted indexing, supporting basic and advanced search queries. 2) Use MATCH and AGAINST keywords to search, support Boolean mode and phrase search. 3) Optimization methods include using word segmentation technology, periodic rebuilding of indexes and adjusting cache size to improve performance and accuracy.

The difference between clustered index and non-clustered index is: 1. Clustered index stores data rows in the index structure, which is suitable for querying by primary key and range. 2. The non-clustered index stores index key values and pointers to data rows, and is suitable for non-primary key column queries.

MySQL is an open source relational database management system. 1) Create database and tables: Use the CREATEDATABASE and CREATETABLE commands. 2) Basic operations: INSERT, UPDATE, DELETE and SELECT. 3) Advanced operations: JOIN, subquery and transaction processing. 4) Debugging skills: Check syntax, data type and permissions. 5) Optimization suggestions: Use indexes, avoid SELECT* and use transactions.

In MySQL database, the relationship between the user and the database is defined by permissions and tables. The user has a username and password to access the database. Permissions are granted through the GRANT command, while the table is created by the CREATE TABLE command. To establish a relationship between a user and a database, you need to create a database, create a user, and then grant permissions.

MySQL and MariaDB can coexist, but need to be configured with caution. The key is to allocate different port numbers and data directories to each database, and adjust parameters such as memory allocation and cache size. Connection pooling, application configuration, and version differences also need to be considered and need to be carefully tested and planned to avoid pitfalls. Running two databases simultaneously can cause performance problems in situations where resources are limited.

MySQL supports four index types: B-Tree, Hash, Full-text, and Spatial. 1.B-Tree index is suitable for equal value search, range query and sorting. 2. Hash index is suitable for equal value searches, but does not support range query and sorting. 3. Full-text index is used for full-text search and is suitable for processing large amounts of text data. 4. Spatial index is used for geospatial data query and is suitable for GIS applications.
