![]() ![]() Please note that you can also share the spare device among multiple ZFS pools. The failed disks is automatically replaced by the spare device and administrator can replace the failed disks at later time. You can also add a spare disk to the zfs pool using the below command, by adding a spare device to a zfs pool. To expand the zpool by adding a new disk use the zpool command as given below: # zpool add -f mypool sde To replace a disk, after a failure or corruption, use the following command: # zpool replace mypool sde sdf To destroy a pool, use the zpool destroy command as shown below: # zpool destroy mypool To view the zpool I/O statistics, use the zpool iostat command as shown below: # zpool iostat -v mypool To export any pool, use the zpool export command and zpool import command is used to import the pool as shown in the following example: # zpool export mypool ![]() ZFS makes this possible by exporting a pool from one system and importing it to another system. There are some cases when you may need to migrate a zfs pools between systems. Next, verify the status of the mirrored zpool that we just created: # zpool status -v # zpool create -f mypool mirror sdb sdc mirror sdd sde As soon as the failed disk is replaced the contents are mirrored back(also known as resilvering) to the newly replaced disk. If any of the disk in the particular mirror group is failed, then the other disk still holds the data. To create a mirrored pool, uze the zpool create command with the following options. # df -hįilesystem Size Used Avail Use% Mounted on Once the pool is created, if you do df –h, you will see the newly created pool is mounted automatically on the mountpount. Next, verify the status of the zpool that we just created. Data and parity is striped across all disks within a raidz group. A raidz group can have single, double or tribe parity meaning it can sustain one, two, or three failures respectively without losing any data.RAIDZ is nothing but the variation of RAID-5 that allows for better distribute on of parity and eliminates the “RAID-5” write hole (data and parity inconsistency after a power loss). The -f option is to ignore disk partition labels since these are new disks.# zpool create -f mypool raidz sdb sdc sdd sde sdf Storage pool is a collection of devices that provides physical storage and data replication for zfs datasets. Zpool command used to configure the storage pools in ZFS. ![]() We have added few disks on this server (/dev/sdb through /dev/sdf) to test the ZFS functionality. On a related note, you may want to read about the basics on how Linux Loadable Kernel Modules are created. Spl 264548 5 zfs,zcommon,znvpair,zavl,zunicode In this case, please install the GCC compiler before installing ZFS.Įnsure that the ZFS modules are loaded us lsmod command as shown below: # lsmod | grep zfs One of the dependencies where the installation normally fails, would be a requirement to install GCC compiler. Please ensure all the dependencies are met. But, the zfs commands mentioned below are same for almost all the distributions on Linux distros except the installation part.Įxecute the following yum commands to install ZFS on Redhat / CentOS. In this article, we’ll be installing ZFS on CentOS server. You can download the source packages for your respective OS distribution from here. You do not have to patch or recompile your kernel. ZFS on Linux is a kernel module that you can download, compile and install. ![]()
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