Omitir para ir al contenido principal
Cerrar

Bienvenido a Dell

Mi cuenta
  • Hacer pedidos rápida y fácilmente
  • Ver pedidos y realizar seguimiento al estado del envío
  • Cree y acceda a una lista de sus productos
  • Administre sus sitios, productos y contactos de nivel de producto de Dell EMC con Administración de la empresa.
Iniciar sesión Crear una cuenta Clientes Premier Iniciar sesión en el programa para partners

Sus carritos de compra de Dell.com

Número del artículo: 000057233

VNX/VNXe Family: Issues with native multipath on Red Hat Enterprise Linux

Resumen: Red Hat Linux servers loses paths and applications become unavailable and in some cases reboot server

Contenido del artículo

Síntomas



Red Hat Enterprise Linux 6 and 7 lose devices by issues on paths and native multipath is not witching over to their alternate paths in a timely fashion, which causes production applications to become unavailable and in some cases rebooting.

Check multipath.conf and configuration its the same recommended on Host connectivity guide for Linux.

 Servers have more than one path to device / hba.

Causa

  • There are multiple parameters that affect error detection and failover times.
    dev_loss_tmo
    fast_io_fail_tmo
    checker_timeout

  • The dev_loss_tmo (rport) effects extended link timeout, in-flight io is held after a link down event for seconds before the driver gives up waiting for the port to come back. Default is 30-35s, so in-flight io can be held seconds before being killed off. After timeout expiration, rport is put in offline (down) state.

  • The fast_io_fail_tmo (rport) effects how long io is queued and held while rport is in blocked state.

  • checker_timeout specify the timeout to user for path checkers that issue scsi commands with an explicit timeout, in seconds; default taken from /sys/block/sd/device/timeout

  • polling_interval - interval between path checks in seconds.

Resolución

  • Add the following parameters to the defaults{} section in /etc/multipath.conf:
Raw

defaults { polling_interval 5 fast_io_fail_tmo 5 dev_loss_tmo 10 checker_timeout 15 }

  • Reload multipathd:
Raw

# service multipathd reload

Propiedades del artículo

Producto comprometido

VNX/VNXe

Producto

Unity All Flash, VMAX, VNX/VNXe

Fecha de la última publicación

20 nov 2020

Versión

2

Tipo de artículo

Solution

Volver al principio