Chapter 7 Working.With Oracle Solaris ZFS Snapshots and Clones.This chapter describes how to create and manage Oracle Solaris ZFS snapshots.Information about saving snapshots is also provided.The following sections are provided in this chapter Overview of ZFS Snapshots.A snapshot is a read only copy of a file system.Snapshots can be created almost instantly, and they initially consume.However, as data within the active.ZFS snapshots include the following features The persist across system reboots.The theoretical maximum number of snapshots is 2.Snapshots use no separate backing store.This is Part 1 of my 832 TB ZFS on Linux series if youre looking for Part 2, follow the link below 832 TB ZFS on Linux Setting Up Ubuntu Part 2.Storage center software Storage Center core Disk Virtualization Manage disks as a single pool and present disk resources to any server Port Virtualization Increase.Snapshots consume.Recursive snapshots are created quickly as one atomic operation.AsA.png' alt='Disk Is Part Of Active Zfs Pool' title='Disk Is Part Of Active Zfs Pool' />The snapshots are created together all at once or not created at all.The. benefit of atomic snapshot operations is that the snapshot data is always.Snapshots of volumes cannot be accessed directly, but they can be cloned.For information about backing up a ZFS.Sending and Receiving ZFS Data.Creating and Destroying ZFS Snapshots.Snapshots are created by using the zfs snapshot command.The snapshot. name is specified as follows filesystemsnapnamevolumesnapname.The snapshot name must satisfy the naming requirements in ZFS Component Naming Requirements.In the following example, a snapshot of tankhomeahrens that.You can create snapshots for all descendent file systems by using the r option.For example zfs snapshot r tankhomenow.NAME USED AVAIL REFER MOUNTPOINT.ROOTzfs. 2BEzfs. BE 7.M 4. G. tankhomenow 0 2.K. tankhomeahrensnow 0 2.M. tankhomeannenow 0 1.M. tankhomebobnow 0 1.M. tankhomecindysnow 0 1.M Snapshots have no modifiable properties.Nor can dataset properties.For example zfs set compressionon tankhomeahrensnow.Snapshots are destroyed by using the zfs destroy command.For example zfs destroy tankhomeahrensnow.A dataset cannot be destroyed if snapshots of the dataset exist.For. example zfs destroy tankhomeahrens.In addition, if clones have been created from a snapshot, then they.For more information about the destroy subcommand.Destroying a ZFS File System.Holding ZFS Snapshots If you have different automatic snapshot policies such that older snapshots.Holding a snapshot prevents it from being destroyed.In addition, this feature allows a snapshot with clones to be deleted pending.Each snapshot has an associated user reference count.This count increases by one whenever a hold.In the previous Solaris release, a snapshot could only be destroyed.In. this Solaris release, the snapshot must also have a zero user reference count.You can hold a snapshot or set of snapshots.For example, the following.You can use the r option to recursively hold the snapshots.For example zfs snapshot r tankhomenow.This syntax adds a single reference, keep, to the.Each snapshot has its own tag namespace.If a hold exists on a snapshot.For example zfs destroy tankhomecindyssnap.If you want to destroy a held snapshot, use the d option.For example zfs destroy d tankhomecindyssnap.Use the zfs holds command to display a list of held.For example zfs holds tankhomenow.NAME TAG TIMESTAMP.Thu Jul 1. 5 1. 1 2.NAME TAG TIMESTAMP.Thu Jul 1. 5 1. 1 2.Thu Jul 1. 5 1. 1 2.Thu Jul 1. 5 1. 1 2.You can use the zfs release command to release a.For example zfs release r keep tankhomenow.If the snapshot is released, the snapshot can be destroyed by using.For example zfs destroy r tankhomenow.Two new properties identify snapshot hold information The deferdestroy property is on if.Otherwise, the property is off.The userrefs property is set to the number.Renaming ZFS Snapshots.You can rename snapshots, but they must be renamed within the same pool.For example zfs rename tankhomecindys0.In addition, the following shortcut syntax is equivalent to the preceding.The following snapshot rename operation is not supported.You can recursively rename snapshots by using the zfs rename r command.For example zfs list.NAME USED AVAIL REFER MOUNTPOINT.K 1. 6. 5. G 2. 2K users.K 1. 6. 5. G 2. 2K usershome.K. usershomemarkm 1.K 1. 6. 5. G 1. 8K usershomemarkm.K. usershomemarks 1.K 1. 6. 5. G 1. 8K usershomemarks. Download Virtual Villagers 2 Mod Apk 2016 more. K. usershomeneil 1.K 1. 6. 5. G 1. 8K usershomeneil.K. zfs rename r usershomeyesterday 2daysago.NAME USED AVAIL REFER MOUNTPOINT.K 1. 6. 5. G 2. 2K usershome.K. usershomemarkm 1.K 1. 6. 5. G 1. 8K usershomemarkm.K. usershomemarks 1.K 1. 6. 5. G 1. 8K usershomemarks.K. usershomeneil 1.K 1. 6. 5. G 1. 8K usershomeneil.K Displaying and Accessing ZFS Snapshots.You can enable or disable the display of snapshot listings in the zfs.This property is enabled by default.If you disable this property.Or, enable the listsnapshots pool.For example zpool get listsnapshots tank.NAME PROPERTY VALUE SOURCE.NAME PROPERTY VALUE SOURCE.Snapshots of file systems are accessible in the.For example, if tankhomeahrens is.You can list snapshots as follows zfs list t snapshot.NAME USED AVAIL REFER MOUNTPOINT.K. poolhomebobmonday 0 1.M. tankhomeahrenstuesday 8.K 7. 80. K. K 1. 0.M. M. tankhomecindystoday 8.K 5. 24. K You can list snapshots that were created for a particular file system.NAME CREATION. Wed Jun 3.Wed Jun 3. 0 1. 6 1.Wed Jun 3. 0 1. 6 1.Wed Jun 3. 0 1. 6 1.Wed Jun 3. 0 1. 6 1.Disk Space Accounting for ZFS Snapshots.When a snapshot is created, its disk space is initially shared between.As. the file system changes, disk space that was previously shared becomes unique.Additionally, deleting snapshots can increase the amount of disk space unique.A snapshots space referenced property value is.You can identify additional information about how the values of the used property are consumed.New read only file system properties.For example zfs list o space.NAME AVAIL USED USEDSNAP USEDDS USEDREFRESERV USEDCHILD.G 6. 75. M 0 2. K 0 6.M. tankhomenow 0.G 2. 59. M 0 2. M 0 0.G 1. 56. M 0 1. M 0 0.G 1. 56. M 0 1. M 0 0.G 1. 04. M 0 1. M 0 0.For a description of these properties, see Table 61.Rolling Back a ZFS Snapshot.You can use the zfs rollback command to discard all.The file. system reverts to its state at the time the snapshot was taken.By default. the command cannot roll back to a snapshot other than the most recent snapshot.To roll back to an earlier snapshot, all intermediate snapshots must.You can destroy earlier snapshots by specifying the r option.If clones of any intermediate snapshots exist, the R option.Note The file system that you want to roll back is unmounted and remounted.If the file system cannot be unmounted, the rollback.The f option forces the file system to be unmounted.In the following example, the tankhomeahrens file.In this example, the wednesday and thursday snapshots.NAME CREATION. Wed Jun 3.Overview of ZFS Clones.A clone is a writable volume or file system whose.As. with snapshots, creating a clone is nearly instantaneous and initially consumes.In addition, you can snapshot a clone.Clones can only be created from a snapshot.When a snapshot is cloned.Even though. the clone is created somewhere else in the dataset hierarchy, the original.The origin property.Clones do not inherit the properties of the dataset from which it was.Use the zfs get and zfs set commands.For more information.ZFS dataset properties, see Setting ZFS Properties.Because a clone initially shares all its disk space with the original.As changes are made to the clone, it uses more disk space.The used property.Creating a ZFS Clone.To create a clone, use the zfs clone command, specifying.The new file system or volume can be located anywhere in.ZFS hierarchy. The new dataset is the same type for example, file system.You cannot create.In the following example, a new clone named tankhomeahrensbug.
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