Should the disk write cache be disabled?

["Da Chun" <ngugc@xxxxxx>]

In this doc,

http://ceph.com/docs/master/rados/configuration/filesystem-recommendations/

It says,

Ceph aims for data safety, which means that when the Ceph Client receives notice that data was written to a storage drive, that data was actually written to the storage drive. For old kernels (<2.6.33), disable the write cache if the journal is on a raw drive. Newer kernels should work fine.

Use hdparm to disable write caching on the hard disk:

sudo hdparm -W 0 /dev/hda

Does it mean the disk write cache should be always disabled for ceph, or just when using the old kernel (<2.6.33)?

Thanks for your time!

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