

Re: Limited write bandwidth from ext3

Sinha_Himanshu emc com wrote:
GB of memory runs RHEL 4U3

We measured the write bandwidth for writes to the block device
and to a file in an ext3 file system.
		Write b/w for 512 KB writes
Block device	312 MBps
Ext2 file		247 MBps
Ext3 file		130 MBps


situation where the buffers are flushed continuously to keep the lun
constanly busy.
(up to 7784 KB).

Himanshu Sinha

Ext3-users mailing list
Ext3-users redhat com

Sounds like you are describing the default ext3 sync'ing feature. ext3 has a mount option "commit", with default value 5 seconds. It causes all data and metadata to be sync'ed every 5. (Cf. 'man mount')

I'm not an expert, so I'm not sure what the potential impact might be (other than delaying sync times) if you change this value.

Kind regards,


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