-
Exploring the XenCenter workspace
-
-
Storage Read Caching
-
-
-
This content has been machine translated dynamically.
Dieser Inhalt ist eine maschinelle Übersetzung, die dynamisch erstellt wurde. (Haftungsausschluss)
Cet article a été traduit automatiquement de manière dynamique. (Clause de non responsabilité)
Este artículo lo ha traducido una máquina de forma dinámica. (Aviso legal)
此内容已经过机器动态翻译。 放弃
このコンテンツは動的に機械翻訳されています。免責事項
이 콘텐츠는 동적으로 기계 번역되었습니다. 책임 부인
Este texto foi traduzido automaticamente. (Aviso legal)
Questo contenuto è stato tradotto dinamicamente con traduzione automatica.(Esclusione di responsabilità))
This article has been machine translated.
Dieser Artikel wurde maschinell übersetzt. (Haftungsausschluss)
Ce article a été traduit automatiquement. (Clause de non responsabilité)
Este artículo ha sido traducido automáticamente. (Aviso legal)
この記事は機械翻訳されています.免責事項
이 기사는 기계 번역되었습니다.책임 부인
Este artigo foi traduzido automaticamente.(Aviso legal)
这篇文章已经过机器翻译.放弃
Questo articolo è stato tradotto automaticamente.(Esclusione di responsabilità))
Translation failed!
Storage Read Caching
Read Caching improves a VM’s disk performance as, after the initial read from an external disk, data is cached within the host’s free memory. It greatly improves performance in situations where many VMs are cloned off a single base VM as it drastically reduces the number of blocks read from disk. For example, Read Caching improves performance in Citrix Virtual Desktops Machine Creation Services (MCS) environments.
This performance improvement can be seen whenever data must be read from disk more than once, as it gets cached in memory. This performance difference is most noticeable in the degradation of service that occurs during heavy I/O situations. For example:
- When a significant number of end users boot up within a narrow time frame (boot storm)
- When a significant number of VMs are scheduled to run malware scans at the same time (antivirus storm)
Note:
The amount of memory assigned to the XenServer control domain (dom0) might need to be increased for the most efficient use of read caching. For instructions on increasing dom0 memory, see Changing the Control Domain Memory.
XenCenter displays the status of Read Caching on the VM’s General tab.
Note:
Storage Read Caching is available for XenServer Premium Edition customers.
Read Caching is enabled by default, provided:
- The XenServer host is licensed with XenServer Premium Edition.
- The VM is attached to a VDI on a file-based SR such as NFS, EXT3/EXT4, or GFS2. Read Caching cannot be used with other SR types.
- The VM is created from a fast clone or a snapshot, or the VM is attached to a read-only VDI.
For detailed information about Read Caching, see Storage read caching.
To disable read caching
You can disable read caching for an SR in its Properties dialog.
- In the Resources pane, select the SR that you want to disable read caching on.
- In the General tab, click Properties.
- In the Properties dialog, deselect Enable Read Caching.
- Click OK.
To enable read caching
You can enable read caching for an SR in its Properties dialog.
- In the Resources pane, select the SR that you want to enable read caching on.
- In the General tab, click Properties.
- In the Properties dialog, select Enable Read Caching.
- Click OK.
- Restart any VMs that you want to benefit from the changed setting.
Related documentation
XenServer 8
Citrix Hypervisor 8.2 Cumulative Update 1
Share
Share
In this article
This Preview product documentation is Cloud Software Group Confidential.
You agree to hold this documentation confidential pursuant to the terms of your Cloud Software Group Beta/Tech Preview Agreement.
The development, release and timing of any features or functionality described in the Preview documentation remains at our sole discretion and are subject to change without notice or consultation.
The documentation is for informational purposes only and is not a commitment, promise or legal obligation to deliver any material, code or functionality and should not be relied upon in making Cloud Software Group product purchase decisions.
If you do not agree, select I DO NOT AGREE to exit.