Write cache: disabled on Clariion CX4-240

First place i would check is to see if the cache for the whole systems is turned off.  in Navisphere/Unisphere, right click a storage processor and click properties.   There should be a tab for cache.  You might have to set some value's first.  check to see if the read/write enabled box is checked.  If it is checked, then it looks like it might have been turned off for the lun's you have listed.   in that case, you will need to right click on each LUN and enable it.

I dont have a GUI in front of me to give you specific options but they are there.

Hey

I got only 1 LUN.

You see 4 HDD because there is 2 HBA card in server connect to 2 FC switch and this FC Switch connect to storage via 2 links - so this is 4 links between server - storage.

Then you can check each lun.  You can selectivly turn off cache on a per lun basis.   I am not a Linux guy but it looks like you listed 4 lun's up top?   Find those lun's in Unisphere and check to see if it is turned off there.

Hello

I check in storage processor and at preference LUN and both got enable read and write 

Any other idea ?

no problem.  like i siad, i dont work with Linux or IBM so i wasnt sure what that outpt above was stating.

SO when you checked your single lun, it had the boxes checked to enable read/write cache?  If so, then i dont think i can help you anymore:(

This sounds more like a problem with the HBA on the host - I'm not aware that a host can actually see the SP or LUN cache status without issuing commands to the array to check the status of the cache on the LUN and SP.

Second, I would check that the configuration is supported. On PowerLink, go to E-Lab and use one of the Wizards to check your hardware/software for the model array you have.

Third, get the Host Connectivity Guide for Linux on PowerLink - you need to ensure that you've set up the correct failover mode on the array for the host, are using some type of failover software (PowerPath) or native MPIO and that it is configured correctly:

Home > Support > Technical Documentation and Advisories > Host Connectivity/HBAs > Installation/Configuration.

Glen

DPO is disable page out.It will allow the intiator to request the targetor not to keep the data in cache which is not freequently using.The problem is mainly based on the file system u are using.You have to partion into multiple file system since u allocate large size to server.

Are you using LVM? any multipathing software? what is the FS type(ext3?) ? what linux version and kernel? Do you see any disk related errors appearing on the linux messages file? Any kernel upgrade recently?

Victor, what is the advantage of keeping multiple partitions? what is the logic?