Chapter 1 Oracle. Solaris ZFS File System (Introduction)This chapter provides an overview of the Oracle Solaris ZFS file system. This chapter also covers some basic terminology. The following sections are provided in this chapter: What's New in ZFS? This section summarizes new features in the ZFS file system. Splitting a Mirrored ZFS Storage Pool (zpool.
Oracle Solaris 1. Release: In this Solaris release, you. For more information, see Creating a New Pool By Splitting a Mirrored ZFS Storage Pool.
New ZFS System Process. Oracle Solaris 1. Release: In this Solaris release, each. ZFS storage pool has an associated process, zpool- poolname.
The threads in this process are the pool's I/O processing threads. I/O tasks, such as compression and checksumming, that are associated. The purpose of this process is to provide visibility into each. CPU utilization. Information about these process can be reviewed. These processes are only available in the global zone. For more information. SDC(7). Changes to the zpool list Command.
There are lots of answers, but none explained nicely what else can be done. Looking into man pages for dd, it is possible to better specify the size of a file.
Oracle Solaris 1. Release: In this Solaris release, the zpool list output has changed to provide better space allocation.
For example: # zpool list tank. NAME SIZE ALLOC FREE CAP HEALTH ALTROOT. G 5. 5. 2. G 8. 0. G 4. 0% ONLINE - The previous USED and AVAIL fields.
ALLOC and FREE. The ALLOC field identifies the amount of physical. The FREE field. identifies the amount of unallocated space in the pool.
For more information, see Holding ZFS Snapshots. ZFS Device Replacement Enhancements. Oracle Solaris 10 9/10 Release: In this Solaris release, a system event or. On modern hardware with 32GB memory or more swap space is rarely used for its primary purpose. Bu Solaris has a very elegant idea of linking swap space and /tmp. Join the Stack Overflow community to: Ask programming questions Answer and help your peers Get recognized for your expertise. Truncating brings up a good time to remind users about sparse files. Before you try to truncate a file, make sure the file isn’t a sparse file.
For more information, see Displaying Information About ZFS Storage Pools. ZFS Storage Pool Recovery. Oracle Solaris 1. Release: A storage pool can become damaged. ZFS configuration.
This release provides new command features for recovering your damaged storage. However, using this recovery feature means that the last few transactions. Both the zpool clear and zpool import commands. F option to possibly recover a damaged pool. In addition, running the zpool status, zpool clear. For more information, see Repairing ZFS Storage Pool- Wide Damage. ZFS Log Device Enhancements.
Oracle Solaris 1. The following log. The logbias property – You can use.
ZFS about handling synchronous requests. If logbias is set to latency. ZFS uses the pool's separate log devices, if any, to handle the requests at. If logbias is set to throughput. ZFS does not use the pool's separate log devices.
Instead, ZFS optimizes. The default value is latency. For most configurations. Using the logbias=throughput value.
AKADIA Information Technology AG, Bern, Schweiz. Therefore, regardless of the current century at the time the data is entered the 'RR' format will ensure that. I’m surprised nobody caught this. The dd command is not blazingly fast. In fact, it is very limited to the IO speed of your disk. The reason why creating a 1GB file. Super Shadow fighting Solaris. Solaris is arguably the most powerful being in the entire Sonic the Hedgehog series; Dr. Eggman theorized that without targeting.
Log device removal – You can now remove a log device. ZFS storage pool by using the zpool remove command. A single log device can be removed by specifying the device name.
A mirrored. log device can be removed by specifying the top- level mirror for the log. When a separate log device is removed from the system, ZIL transaction records. Redundant top- level virtual devices. For example, in a mirrored storage. For more information, see Example 4–3.
Triple Parity RAIDZ (raidz. Oracle Solaris 1. Release: In this Solaris release, a redundant RAID- Z configuration. You can specify the raidz. RAID- Z configuration.
For more information, see Creating a RAID- Z Storage Pool. Holding ZFS Snapshots. Oracle Solaris 1. Release: If you implement different automatic.
Solaris. release. Holding a snapshot prevents it from being destroyed. In addition, this. You can hold a snapshot or set of snapshots. For example, the following. For more information, see Holding ZFS Snapshots.
ZFS Device Replacement Enhancements. Oracle Solaris 1. Release: In this Solaris release, a system event or sysevent is. ZFS has been enhanced to recognize these. You can use the autoexpand pool property to enable or disable automatic pool expansion. These features enable you to increase the pool sizewithout.
For example, the autoexpand property isenabled. Or, you can create the pool with the autoexpand property. The autoexpand property is disabled by default so. The pool size also be expanded. For. example: # zpool online - e tank c. Or, you can reset the autoexpand property after the larger disk is attached or made.
For example. the following pool is created with one 8- GB disk (c. The 8- GB disk is replaced with a 1. GB disk (c. 1t. 13d. NAME SIZE ALLOC FREE CAP HEALTH ALTROOT.
G 7. 6. 5. K 8. 4. G 0% ONLINE - .
NAME SIZE ALLOC FREE CAP HEALTH ALTROOT. G 9. 1. 5. K 8. 4.
G 0% ONLINE - . NAME SIZE ALLOC FREE CAP HEALTH ALTROOT. G 9. 1. 5. K 1. 6. G 0% ONLINE - Another way to expand the LUN in the above example without enabling. For example: # zpool create tank c.
NAME SIZE ALLOC FREE CAP HEALTH ALTROOT. G 7. 6. 5. K 8. 4. G 0% ONLINE - .
NAME SIZE ALLOC FREE CAP HEALTH ALTROOT. G 9. 1. 5. K 8. 4. G 0% ONLINE - . NAME SIZE ALLOC FREE CAP HEALTH ALTROOT. G 9. 0K 1. 6. 8. G 0% ONLINE - Additional device replacement enhancements in this release include the. In previous releases, ZFS was not able to replace an existing.
In this release, you can replace an existing disk with another. In this release, you do not need to reboot the system or export. As described above, you can enable the autoexpand property. For more information about replacing devices, see Replacing Devices in a Storage Pool. ZFS and Flash Installation. Support. Solaris 1.
Release. In this Solaris release, you can set up a Jump. Start profile to identify a. ZFS root pool. For more information, see Installing a ZFS Root File System (Oracle Solaris Flash Archive Installation). ZFS User and Group Quotas. Solaris 1. 0 1. 0/0. Release: In previous Solaris releases.
ZFS file systems to manage and. In this Solaris release, you can set a quota on the amount of disk space. You might. consider setting user and group quotas in an environment with a large number. You can set a user quota by using the zfs userquota property. To set a group quota, use the zfs groupquota property. For example: # zfs set userquota@user.
G tank/data. # zfs set groupquota@staff=1. G tank/staff/admins. You can display a user's or a group's current quota setting as follows: # zfs get userquota@user. NAME PROPERTY VALUE SOURCE. G local. # zfs get groupquota@staff tank/staff/admins.
NAME PROPERTY VALUE SOURCE. G local. Display general quota information as follows: # zfs userspace tank/data.
TYPE NAME USED QUOTA. POSIX User root 3. K none. POSIX User user. G # zfs groupspace tank/staff/admins.
TYPE NAME USED QUOTA. POSIX Group root 3. K none. POSIX Group staff 0 1. G You can display an individual user's disk space usage by viewing the userused@user property. A group's disk. space usage can be viewed by using the groupused@group property. For example: # zfs get userused@user.
NAME PROPERTY VALUE SOURCE. M local. # zfs get groupused@staff tank/staff. NAME PROPERTY VALUE SOURCE. M local. For more information about setting user quotas, see Setting ZFS Quotas and Reservations. ZFS ACL Pass Through Inheritance for Execute Permission. Solaris 1. 0 1. 0/0. Release: In previous Solaris releases.
ACL inheritance so that all files are created with 0. In this release, if you want to optionally include. ACL, you can. set the aclinherit mode to pass the execute permission. ACL. If aclinherit=passthrough- x is enabled on a ZFS dataset. If the inherited ACL. For more information, see Example 8–1.
ZFS Property Enhancements. Solaris 1. 0 1. 0/0. Oracle. Solaris 1. The following ZFS file system.
ZFS Snapshot Stream Property Enhancements – You can set a received property that is different from. For example, you might receive a stream with the. This means that the received stream has a received compression. Since the local value overrides the received value, you don't have to worry.
The zfs get command shows the effective value of the compression property. VALUE column. New ZFS command options. Use the zfs inherit- S to. If a property. does not have a received value, the behavior of the zfs inherit- S command is the same as the zfs inherit command. S option. If the property does have a received. S command reverts it to the received value. You can use the zfs get- o to.
RECEIVED column. Or, use the zfs get- o all command to include all columns, including RECEIVED. You can use the zfs send- p option. R option. In addition, you can use the zfs send- e option.
The following example sends the poola/bee/cee@1 snapshot. NAME USED AVAIL REFER MOUNTPOINT. K 1. 34. G 2. 3K /poola. K 1. 34. G 2. 3K /poola/bee.
K 1. 34. G 2. 1K /poola/bee/cee. K - . # zfs send - R poola/bee/cee@1 | zfs receive - e poold/eee. NAME USED AVAIL REFER MOUNTPOINT. K 1. 34. G 2. 3K /poold.
K 1. 34. G 2. 3K /poold/eee. K 1. 34. G 2. 1K /poold/eee/cee.
K - Setting ZFS file system properties. You can set ZFS file system properties. In the following example, compression is enabled. ZFS file system that is created when the pool is created: # zpool create - O compression=on pool mirror c. Setting cache properties on a ZFS.
Two new ZFS file system properties enable you. ARC) and the secondary cache. L2. ARC). The cache properties are set as follows: primarycache – Controls what is cached. ARC. secondarycache – Controls what is. L2. ARC. Possible values for both properties – all, none, and metadata.
If set to all. both user data and metadata are cached. If set to none. neither user data nor metadata is cached.
If set to metadata. The default is all.
You can set these properties on an existing file system or when a file. For example: # zfs set primarycache=metadata tank/datab. When these properties are set on existing file systems, only new I/O. Some database environments might benefit from not caching user data.
You must determine if setting cache properties is appropriate for your environment. Viewing disk space accounting properties –.
New read- only file system properties help you identify disk space usage for. The properties are as follows: usedbychildren – Identifies the amount. The property abbreviation is usedchild. Identifies the amount. The property abbreviation is usedds. Identifies. the amount of disk space that is used by a refreservation set.
The property abbreviation is usedrefreserv.
How to create a file with a given size in Linux? Please, modern is easier, and faster. On Linux, (pick one)truncate - s 1. G foo. fallocate - l 5. G bar. It needs to be stated that truncate on a file system supporting sparse files will create a sparse file and fallocate will not. A sparse file is one where the allocation units that make up the file are not actually allocated until used. The meta- data for the file will however take up some considerable space but likely no where near the actual size of the file.
You should consult resources about sparse files for more information as there are advantages and disadvantages to this type of file. A non- sparse file has its blocks (allocation units) allocated ahead of time which means the space is reserved as far as the file system sees it. Also fallocate nor truncate will not set the contents of the file to a specified value likedd, instead the contents of a file allocated with fallocate or truncate may be any trash value that existed in the allocated units during creation and this behavior may or may not be desired.
The dd is the slowest because it actually writes the value or chunk of data to the entire file stream as specified with it's command line options. This behavior could potentially be different - depending on file system used and conformance of that file system to any standard or specification. Therefore it is advised that proper research is done to ensure that the appropriate method is used.