1/5/2024 0 Comments Volume manager note 4Let's check to make sure each have a usable file rdc]# lsblk -o NAME,FSTYPEĮach is now using the XFS file system. Realtime = none extsz = 4096 blocks = 0, rtextents = rdc]# Realtime = none extsz = 4096 blocks = 0, rtextents = rdc]# mkfs.xfs -f /dev/sdc1 = sectsz = 512 sunit = 0 blks, lazy-count = 1 Log = internal log bsize = 4096 blocks = 2560, version = 2 Naming = version 2 bsize = 4096 ascii-ci = 0 ftype = 1 We will be using the XFS file rdc]# mkfs.xfs -f /dev/sdb1 Make the File Systemįinally, before mounting and using any volume we need to add a file system. Information − You may need to update rdc]# lsblkĪs you can see from lsblk output, we now have two partitions, each on sdb and sdc. Yes/No? rdc]# parted -a opt /dev/sdc mkpart primary ext4 0% 100% The closest location we can manage is 17.4kB to 1048kB (sectors 34.2047). Warning − You requested a partition from 0.00B to 6442MB (sectors 0.12582911). To create partitions, the parted command is used rdc]# parted -a opt /dev/sdb mkpart primary ext4 0% 100% We will only create a single partition on each disk. Simply run the parted command in the same manner on sdc. Warning: The existing disk label on /dev/sdb will be destroyed and all data on thisĭisk will be lost. Create a Disk rdc]# parted /dev/sdb mklabel GPT Both sdb and sdc were added to the system for this tutorial. Let's see what disks CentOS rdc]# lsblkĪs you can see, we have three disks on this system: sda, sdb, and sdc.ĭisk sda contains our working CentOS installation, so we do not want to toy around with sda. lsblk is a great tool for getting disk information. I'd always advise enumerating disks every time before performing operations considered as destructive. Now, assuming we have added another disk or two to our system, we need to enumerate disks detected by Linux. These tools will come handy and still have use with today's advanced LVM tools such as the System Storage Manager: lsblk, parted, and mkfs.xfs. Traditional Linux Disk Administration Toolsīefore being acquainted with the latest and greatest featured tools for LVM Management in CentOS 7, we should first explore more traditional tools that have been used for Linux disk management. If we have two physical disks of 1TB each, we can create a volume group of almost 2TB amongst the two.įrom the volume group, we can create three logical volumes each of any-size not exceeding the total volume group size. Example: disk /dev/sda is partitioned to include two physical partitions: /dev/sda1 and /dev/sda1 Keep in mind, physical partition is not recommended in most common LVM setups. Seen as a storage facility to the operating systemĪ physical volume will be seen as /dev/sda, /dev/sdb a physical disk that is detected by Linux.Ī physical partition will be a section of the disk partitioned by a disk utility such as fdisk. Understanding each piece of a logical volume is important to manage them. Please study the following table to get a firm grasp of each component. ![]() ![]() When learning about volume management with LVM, it is easier if we know what each component in LVM is. This works in a similar fashion to RAID 0 striping data across separate disks. Note − Using Logical Volumes actually increases disk I/O when configured correctly. One single disk can even be used for snapshots of Logical Volumes. Or even two logical volumes of 1.5TB, 5 volumes of 500GB, or any combination. ![]() With LVM, it is possible to have (for example) three physical disks of 1TB each, then a logical volume of around 3TB such as /dev/sdb. However, it can be thought of in a similar concept as RAID 0 or J-Bod. Logical Volume Management (LVM) is a method used by Linux to manage storage volumes across different physical hard disks.
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