Mid-week mejor forma add discos VMs system

Buenas tardes,

Estoy dando vueltas has training in the configurated put en nuevas disco unidades VMs (access a LUN of mi storage).

Tengo maquinas montadas in las as creo discos (unidades) mediante initiator Microsoft iSCSI, unidades RAW, unidades creadas en propia Máquina (virtual disk)...  El problema, no tengo claro cual're the mejor forma.

(1) the option of Microsoft iSCSI initiator descarto directly por lo that there is hablamos en otro post as shelter.  You can reach a pudiendo el performance of Vcpu al usar misma CPD para iSCSI is the VM.

(2) the option of crear las unidades RAW acceso mediante me dijeron than era muy recomendable. SE me plantea una duda con esta opcion. If por algun reason tengo mover the VM has otro storage, puedo moverlo con directly VMotion?. Tengo back equalogic, if the first falla tengo suerte of tener otra equalogic that poder mover of formed temporal los discos. ¿podria to get a mover una unidad RAW of the misma forma puedo mover than a virtual disk? Dando a migration Quebec mueva todo y a the diga donde...

(3) virtual disk to add a VM of the. This option is no se tal behaved of performance o If tiene alguna pega.

MUCHAS gracias,.

Saludos.

Hola como estas?

Esto you can serve.

http://www.VMware.com/files/PDF/performance_char_vmfs_rdm.PDF (ex of forma detailed)

The mayoria of los casos para will be replaced by Recomiendan use discos Office VMDK, menos that exista una necesidad especifica, como crear a MSCS Cluster, Quebec requiera el uso clubs RDM.

  • Los mas VMDK son mobile discos
  • Los discos son mas easy redimensionar VMDK.
  • Hay menos environment administrativa con discos VMDK.
  • Los discos VMDK son mas easy respaldar y recover.
  • ES mas sencillo clonar MV con discos VMDK.
  • Taken by el uso instant.

Tanto los discos VMDK como los discos RDM tienen features similar performance, por lo as esto no debiera ser a relevant factor was the hora to define el tipo do clubs use.

En as casos podemos better use RDM discos?

  • Para configurar a MSCS Cluster in una Cluster config between boxes.
  • Para configurar una MV para usar NPort ID Virtualization (NPIV)
  • By using tools of Administration United Nations of SAN storage nativas.  For example, perform Snapshots has storage level, Replicación a level of storage, etc.
  • If requerimos adjuntar una LUN existente a MV, sin than sea formateada como esta una a VMFS Datastore.  For example, the LUN adjuntar a file server.  This can be of utility Esto con el end of avoid además the Migración of large volumes of data a UN disco VMDK during a P2V conversion.
  • Para eliminate potential compatibility problems o please than las applications to ejecuten in ambiente virtualizado sin perder na none.
  • Para run software of administration of SAN desde the MV, y este tiene impacto directo en the LUN.

RDM compatibility o en física virtual?

In case of decide use RDM discos, to debe decide además TR use el virtual compatibility mode o el modo compatibility física.

  • Modo de virtual compatibility: Este modo virtualiza completely el device Editor, el cual appears in the virtual Máquina como a UN volumen VMFS virtual disco.  Este modo benefits of VMFS, the protection of datos como los provee y el uso of Snapshots.
  • Physical compatibility mode: Este modo provee acceso a las caracteristicas del device editor material most.  VMKernel pasa todos los comandos SCSI al device, exponiendo este modo todas las caracteristicas del physical material subyacente.

El virtual compatibility mode are el recomendado para los casos, a menos most what requiera explicitamente el uso of the physical compatibility.  For example, en UN sober Microsoft Windows Server 2008 Failover Cluster, is it requires a persistent group (PMP) SCSI-3, which booking are available solo in utilizando RDM en física compatibility mode.

Al use discos RDM en modo compatibility fisica we must consider what habra una series of funcionalidades that there is no be available encontraran:

  • Snapshots.  Esto especially can be muy crítico, whereas muchas respaldo soluciones, como vDR sub-granting del uso of Snapshots.
  • vMotion; No posible mover are not con una MV vMotion RDM compatibility física en con.
  • Clonado of stupid MV RDM compatibility fisica en.
  • No en are posible convert MV una con discos RDM modelUnited Nations.

Al use RDM virtual compatibility mode en discos to pueden superar casi todas estas reduced, permitting the use of vMotion, snapshot y Clonado of VM.

Para los discos VMDK

Cuando is crea a disco virtual en VMware, por defecto, el tipo use are thick.  Reserva UN thick disco todo el espacio durante the creation del disco, utilizandolo efectivamente en el Datastore especificado.

UN do thin disco no annual una reserva todo el espacio durante disco the creation del asignado previa.  Los blocking in el archivo VMDK not el son en reserved storage fisico ellos son written during the course of normal until knew Operación.

Cada tipo disco tiene advantages claras y and/or, y del uso as the al disco daremos depends decision.  For example, if el disco will be used por una base datos con muchas helps, will be replaced by Recomiendan el uso clubs in thick formato, are only in formato thin el disco creceria muy rapidamente el uso injustificado doing this type of nightclubs.

Guide is thick and/or of Provisioning:

  • Config y Monitoreo of storage mas simple
  • Fault tolerance Soporte en para VMware
  • Menos in el espacio uso eficiente
  • Mayores costos storage

Advantages y and/or of Thin provisioning

  • El costo of storage to reduce
  • Elimina the need of dedicar desde a King, toda capacidad por una application required.
  • The fragmentacion los discos tiene effects fan en del disco performance.
  • Thin only Provisioning could no ser lo mas spending en ambientes donde el tamano los discos office will have a rapida tasa of politics.
  • Thin Provisioning aumenta of El riesgo quedarse sin espacio in a data store.  Este riesgo can be mitigado using alarmas is deferred storage.
  • SE deben monitorear y crear alarmas apropiadas.

Tags: VMware

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