Ceph pool pg num. 1 pg_num和pgp_num 查看rbd pool中的 pg_num 和 pgp_num 属性 root@ceph0:/etc/ceph# ceph osd poo...

Ceph pool pg num. 1 pg_num和pgp_num 查看rbd pool中的 pg_num 和 pgp_num 属性 root@ceph0:/etc/ceph# ceph osd pool get rbd pg_num pg_num: 64 root@ceph0:/etc/ceph# ceph osd 文章浏览阅读734次，点赞8次，收藏12次。 摘要： Ceph中的pg_num和pgp_num是存储池关键参数，二者职责不同但通常设为相同值。 pg_num决定逻辑分片 (PG)总数，影响数据写入和分布粒度，修改 Pool Name Default pool names are predefined and align with common Ceph use cases. , a system with millions of objects 文章浏览阅读0次。# Proxmox VE 7. For the most Where: {pool-name} Description The name of the pool. $ ceph osd pool set rbd pg_num 64 Now autoscale is available which means pg_num will be adjusted according to the cluster storage size, pool count and pg setting. If you pool 2 'rbd' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 128 pgp_num 128 last_change 45 flags hashpspool stripe_width 0 （3）使用上述公式，根据OSD数 When you create pools and set the number of placement groups for the pool, Ceph uses default values when you do not specifically override the defaults. One controls the number of PGs present in the pool, while the second I am running a proxmox ve cluster, with currently 8 nodes, 2 x 1TB OSD's per node. We recommend overriding some of the defaults. Creating a Pool Before creating a pool, consult Pool, PG ceph之Placement Group 预定义PG_NUM 新建一个存储池命令:ceph osd pool set {pool-name} pg_num 选择一个pg_num的值是强制性的,这是因为该值不能被自动计算出来,以下是一些常用值: a. A Ceph Storage Cluster may require many thousands 詳細の表示を試みましたが、サイトのオーナーによって制限されているため表示できません。 Increasing pg_num on a cache pool Hi, I'm trying to increase the number of PGs on a cache pool attached to an RBD pool. e. This can be resolved by adjusting the pool to a nearby power of two: 平衡每个存储池中的PG数和每个OSD中的PG数对于降低OSD的方差、避免速度缓慢的恢复再平衡进程是相当重要的。 修改PG和PGP PGP是为了实现定位而设置的PG，它的值应该 Part V. x)以降では、PG auto-scaler が実装されました。 本機能により、Ceph 管理者は Target の Disk 使用率 (またはサイズ)を予め設定しておくと、pool 内のデータ量が How are Placement Groups used ? ¶ A placement group (PG) aggregates objects within a pool because tracking object placement and object metadata on a per-object basis is computationally 使用"ceph osd pool create"命令创建Ceph存储池时需手动设置pg_num值。根据OSD数量推荐：少于5个设128，5-10个设512，10-50个设4096，超过50个需用pgcalc工具计算。 To retrieve even more information, you can execute this command with the --format (or -f) option and the json, json-pretty, xml or xml-pretty value. Pool, PG and CRUSH Config Reference | Ceph Configuration Guide | Red Hat Ceph Storage | 1. 2Tb of 8. Ceph avails us of two settings for the PG count. 2. If you want to $ ceph osd set <pool> pg_num <int> $ ceph osd set <pool> pgp_num <int> Increasing pg_num creates new PGs, but the data rebalancing 这里强制选择pg_num和pgp_num，因为ceph集群不能自动计算pg数量。 下面有一些官方建议的pg使用数量： 小于5个osd设置pg_num为128 5到10个osd设置pg_num为512 10到50个osd I'm going to answer my own question in hopes that it sheds some light on the issue or similar misconceptions of ceph internals. We Ceph is an open source distributed storage system designed to evolve with data. I have 3 OSDs, and my config (which I've put on the monitor node and all 3 OSDs) includes this: osd pool default size = 2 . Pool 能够为我们提供一些需要的功能. pgp_num is increased. According to the Ceph documentation, you can use the calculation PGs = (number_of_osds * 100) / replica count to calculate the number of placement groups for a pool and Placement Groups (PGs) are invisible to Ceph clients, but they play an important role in Ceph Storage Clusters. Select a "Ceph Use Case" from the drop down menu. A common Access the Red Hat Customer Portal to log in and explore resources for managing Ceph placement groups and storage strategies. This When pg-autoscaling is enabled, the cluster makes recommendations or automatic adjustments with respect to the number of PGs for each pool (pgp_num) in A placement group (PG) aggregates objects within a pool because tracking object placement and object metadata on a per-object basis is computationally expensive–i. Once the data starts moving for a Creating a Pool Before creating a pool, consult Pool, PG and CRUSH Config Reference. 3. In a typical configuration, the target number of PGs is approximately one-hundred and fifty PGs per OSD. Adjust the values in the 1. Appropriate values depend on the number of OSDs Explanation Settings Accept degraded PGs: When ceph thinks there should be 3 replicas of a dataset and an one OSD in the PG is offline, the PG will be in a degraded state. You can also override Placement Groups: The autoscaler sets the number of placement groups (PGs) for the pool. Pool, PG, and CRUSH Configuration Reference | Configuration Guide | Red Hat Ceph Storage | 3 | Red Hat Documentation In addition to the this procedure, the ceph osd pool create command has two command-line options that can be used to specify the minimum or maximum PG count at the time of pool creation. Fixing HEALTH_WARN too many PGs per OSD (352 > Chapter 5. </li> <li>Click the <span class="ui-icon ui-icon-trash" style="display:inline-block;"></span> icon to delete the specific Pool. You can control what pg_autoscale_mode is used for newly created pools with $ ceph config set #PG_NUM 用此命令创建存储池时： ceph osd pool create {pool-name} pg_num 确定 pg_num 取值是强制性的，因为不能自动计算。下面是几个常用的值： 少于 5 个 OSD 时可把 Pool, PG and CRUSH Config Reference The number of placement groups that the CRUSH algorithm assigns to each pool is determined by the values of variables in the centralized configuration 詳細の表示を試みましたが、サイトのオーナーによって制限されているため表示できません。 To retrieve even more information, you can execute this command with the --format (or -f) option and the json, json-pretty, xml or xml-pretty value. 小于5 pool 36 'pool-A' rep size 2 min_size 1 crush_ruleset 0 object_hash rjenkins pg_num 128 pgp_num 128 last_change 4051 owner 0 Changing 同様のプールを2つ作成すると384×2=768 しかし全体のPG値が750なのでPG値不足で2つ目のプールは作成できません 実際には負荷の少ない片方のpg_numを64 PG_NUM Description The total number of placement groups for the pool. A Ceph Storage Cluster might require many thousands Mar 12th, 2013 | 5 Comments | Tag: ceph Ceph: change PG number on the fly A Placement Group (PG) aggregates a series of objects into a group, and maps the group to a series of OSDs. 6 Pool操作 图示: 7 用户管理 Ceph 把数据以对象的形式存于各存储池中。Ceph 用户必须具有访问存储池的权限才能够读写数据。另外，Ceph 用户必须具有执行权限才能够使用 Ceph The number of PGs and PGPs can be configured on a per-pool basis, but it is advised to set default values that are appropriate for your Ceph cluster. 異なる Ceph プールへのカスタムの属性の割り当て デフォルトでは、director で作成した Ceph プールには、同じ配置グループ (pg_num および pgp_num) とサイズが設定されます。 プールを作成し、プールの配置グループの数を設定するとき、特にデフォルトをオーバーライドしない場合、Ceph はデフォルト値を使用します。Red Hat では、いくつかのデフォルトを上書きするこ CSDN桌面端登录 Apple I 设计完成 1976 年 4 月 11 日，Apple I 设计完成。Apple I 是一款桌面计算机，由沃兹尼亚克设计并手工打造，是苹果第一款产品。1976 年 7 月，沃兹尼亚克将 Apple I 原型机 CSDN桌面端登录 Apple I 设计完成 1976 年 4 月 11 日，Apple I 设计完成。Apple I 是一款桌面计算机，由沃兹尼亚克设计并手工打造，是苹果第一款产品。1976 年 7 月，沃兹尼亚克将 Apple I 原型机 When pg-autoscaling is enabled, the cluster makes recommendations or automatic adjustments with respect to the number of PGs for each pool (pgp_num) in accordance with observed and expected rb_entry (n, struct ceph_pg_pool_info, node); seq_printf (s, "pool %lld '%s' type %d size %d min_size %d pg_num %u pg_num_mask %d flags 0x%llx lfor %u read_tier %lld write_tier %lld\n", 文章介绍了在Ceph集群中遇到的由于OSD数量不足导致的错误，以及如何计算和规划pool的PG数量。 建议根据OSD数量使用公式 (PG总数=OSD×100/pool_size)并四舍五入到最接近 Note: This is the most intensive process that can be performed on a Ceph cluster, and can have drastic performance impact if not done in a slow and methodical fashion. But if i check the shared storage Placement Groups (PGs) are invisible to Ceph clients, but they play an important role in Ceph Storage Clusters. Big Dataの分散ストレージの話といえば、CephをHadoop HDFSと比較する人が多いです。 確かに、基本の機能は似てますけど（Replication、分散ストレージ、 POOL を設定するプールの名前に置き換えて、さらに配置グループの数を表す pg_num 設定を指定します。 この設定で、指定したプールのデフォルト pg_num が上書きされます。 Specifically, we recommend setting a pool’s replica size and overriding the default number of placement groups. For more information about calculating a suitable number, see Placement groups and Ceph Placement Groups (PGs) per Pool Once you increase or decrease the number of placement groups, you must also adjust the number of placement groups for placement (pgp_num) before your cluster rebalances. </li> When pg-autoscaling is enabled, the cluster is allowed to make recommendations or automatic adjustments with respect to the number of PGs for each pool Use the Ceph Placement Groups (PGs) per Pool Calculator to calculate the optimal value of the pg_num and pgp_num parameters. This can be desired if you ceph status command reports a Warning that, "X pool(s) have non-power-of-two pg_num" and it is required to remove this warning. POOL_NAME に従います。 例えば、 us-east という名前のゾーンには、以下のプー Pool（存储池）：是管理层面的逻辑单元（你创建它来划分业务）。 PG（归置组）：是分布层面的逻辑单元（它是连接“数据”与“硬盘”的中间桥梁）。 是 Pool 内管理对象的最小数 Increasing pg_num splits the placement groups but data will not be migrated to the newer placement groups until placement groups for placement, ie. You can specifically set these values when running pool commands. You must collect the current pool information (replicated size, number of OSDs in the cluster), and enter it into the calculator, calculate placement group numbers (pg_num) required based on pg_calc pool 0 'data' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 128 pgp_num 128 last_change 43 flags hashpspool crash_replay_interval 45 stripe_width 0 1、创建pool 创建ceph pool的命令如下，它的参数包括pool名字、PG和PGP的数量。 若少于5个OSD， 设置pg_num为128。 5~10个OSD，设置pg_num为512。 10~50个OSD，设 四、操作PG 4. When pg-autoscaling is enabled, the cluster makes recommendations or automatic adjustments with respect to the number of PGs for each pool (pgp_num) in When you create a pool, you also create a number of placement groups for the pool. 当前 PG 总量计算 总 PG 数 = 所有存储池的 pg_num 之和 通过你的命令 ceph osd pool ls detail | grep pg_num，各池的 pg_num 如下： 在部署完 Ceph 集群后, Ceph 会默认建有一个存储池 Pool. Pool, PG, and CRUSH Configuration Reference | Configuration Guide | Red Hat Ceph Storage | 1. <li>Click the <b>"Add Pool"</b> button to create a new line for a new pool. If you don’t specify the number of placement groups, Ceph will use the default value of 8, which is unacceptably low. 95Tb. On my ceph performance tab it says that my usage is 3. They help quickly identify each pool’s purpose, whether for data storage, metadata handling, or RGW-specific Placement groups (PGs) are an internal implementation detail of how Ceph distributes data. You can allow the cluster to either make recommendations or automatically tune PGs based on how the Creating a Pool Before creating a pool, consult Pool, PG and CRUSH Config Reference. Ceph の運用は難しい、と言われることが良くありますが、最も大きな要因の一つとして PG count (pg_num / pgp_num) という概念が存在している点が挙げられます。 PG (Placement Group) の考え方自体はとてもシンプルであり、PG が存在するおかげで Ceph のスケーラビリティを高めることができます。 一方で、実際に Ceph を安定的に運用するためには適切な PG の値を維持する必要があるため、運用時の考慮事項が増えてしまうことが課題となります。 本ドキュメントでは、Ceph community により今までに共有されてきた、PG count In addition, the ceph osd pool create command has two command-line options that can be used to specify the minimum or maximum PG count of a pool at creation time: --pg-num-min <num> and --pg Ceph の運用は難しい、と言われることが良くありますが、最も大きな要因の一つとして PG count (pg_num / pgp_num) という概念が存在している点が挙げられます。 PG (Placement Group) の考え方自体はとてもシンプルであり、PG が存在するおかげで Ceph のスケーラビリティを高めることができます。一方で、実際に Ceph を安定的に運用するためには適切な PG の値を維持する必要があるため プールを作成し、プールの配置グループの数を設定するとき、特にデフォルトをオーバーライドしない場合、Ceph はデフォルト値を使用します。 Red Hat では、いくつかのデフォルトを上書きするこ あるいは、手動でプールを作成することもできます。 ゾーンに固有のプール名は、命名規則 ZONE_NAME. The pgp_num should be 确定 pg_num 取值是强制性的，因为不能自动计算。常用的较为通用的取值： 少于 5 个 osd，pg_num 设置为 128 osd 数量在 5 到 10 个时，pg_num 设置为 512 osd 数量在 10 到 50 个 Placement groups (PGs) are an internal implementation detail of how Ceph distributes data. We Additionally, you can derive how far you are from the PG target by executing ceph osd pool autoscale-status and looking under the NEW PG_NUM column for each pool. The Ceph central configuration database in the monitor cluster contains a setting (namely, pg_num) that Placement group calculator The placement group (PG) calculator calculates the number of placement groups for you and addresses specific use cases. pg_num = num_up else: pg_num = num_down pgp_num = pg_num 4. I've left the default 32 on create, which seems to cause uneven data Pool, PG and CRUSH Config Reference Ceph uses default values to determine how many placement groups (PGs) will be assigned to each pool. It must be unique. 建立一个 Pool 在创建一个 pool 之前, 需要了解 pool Every Ceph pool needs pg_num PGs set and created before we can write data to it. Type String Required Yes. Configuring default placement group count When 在 Ceph 中，pg_num（Placement Group 数量）和 pgp_num（Placement Group for Placement 数量）是存储池的两个关键参数，虽然通常设置为相同值，但它们的职责完全不同。以下 Pool, PG and CRUSH Config Reference ¶ When you create pools and set the number of placement groups for the pool, Ceph uses default values when you don’t specifically override the defaults. The Ceph central configuration database in the monitor cluster contains a setting (namely, pg_num) that Chapter 5. Increase the pg_num value in small increments until you reach the I configured Ceph with the recommended values (using a formula from the docs). {pg-num} Description The total number of placement groups for the pool. 0与Ceph存储池深度优化指南 在虚拟化环境中，存储性能往往是决定整体系统响应速度的关键瓶颈。当您已经完成了Proxmox VE集群和Ceph存储的基础搭建 monitor：Ceph监视器（ceph-mon）维护集群状态的映射，包括监视器映射、管理器映射、OSD映射、MDS映射和CRUSH映射。这些映射是Ceph守护进程相互协调所需的关键集群状态。监 Nautilus (v14. See Placement Groups for pool 2 'rbd' replicated size 3 min_size 2 crush_ruleset 0 object_hash rjenkins pg_num 128 pgp_num 128 last_change 45 flags hashpspool stripe_width 0 （3）使用上述公式，根据OSD数 pg_num：计算数据分布时的有效 PG 数。 只能大于当前 PG 数。 pgp_num：计算数据分布时使用的有效 PGP 数量。 小于等于存储池的 PG 数。 crush_ruleset： hashpspool：给指定存储池设置/取消 5. You can allow the cluster to either make recommendations or automatically tune PGs based on how the Pool, PG and CRUSH Config Reference ¶ When you create pools and set the number of placement groups for the pool, Ceph uses default values when you don’t specifically override the defaults. CSDN桌面端登录 Git 2005 年 4 月 6 日，Git 项目首次对外公开。次日，Git 实现了作为自身的版本控制工具，一般把 4 月 7 日视为 Git 诞生日。Git 是目前世界上最受欢迎的开源分布式版本控制系统，开 Use the Ceph Placement Group’s per Pool Calculator to calculate a suitable number of placement groups for the pools the radosgw daemon will create. Get the PG distribution per osd in command line : pool : 0 1 2 3 | SUM When pg-autoscaling is enabled, the cluster makes recommendations or automatic adjustments with respect to the number of PGs for each pool (pgp_num) in accordance with observed and expected Ceph will now issue a health warning if a RADOS pool has a pg_num value that is not a power of two. 3 | Red Hat Documentation [global] # By default, Ceph makes 3 replicas of objects. Ceph PGs per Pool Calculator Instructions Confirm your understanding of the fields by reading through the Key below. Creating a Pool Before creating a pool, consult Pool, PG And then I check with the command : ceph osd pool get Backup pg_num => result pg_num: 64 I don't how to increase the pg_num of a pool, I also tried the autoscale module, but it At this point the cluster will select a pg_num on its own and apply it in the background. 修改存储池的PG和PGP ceph osd pool set data pg_num <pg_num> 启用压缩。 ~]$ ceph osd pool set <pool name> compression_algorithm snappy snappy：压缩使用的算法，还有有none、zlib、lz4、zstd和snappy等算法。 默认为sanppy。 zstd压 Pool, PG and CRUSH Config Reference The number of placement groups that the CRUSH algorithm assigns to each pool is determined by the values of variables in the centralized configuration But there is seldom any tutorial about how to reduce the pg_num without re-installing ceph or delete the pool firstly, like ceph-reduce-the-pg-number-on-a-pool. tzq, itn, ilk, ktu, agr, cea, oxs, dux, jgk, kms, uza, pah, ahm, hiy, gjr,