Unless this changed in 2.6 the block devices go through VFS, and the blocks get cached by the VFS layer.
-----Original Message----- From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of Mark Perry Sent: Thursday, August 21, 2008 11:07 PM To: [email protected] Subject: Re: Root filesystem error switches to ReadOnly Fargusson.Alan wrote: > Doing a dd on a device goes through the cache, so in this case the cache > can't be the problem. Really? dd is designed to work on block devices that are not mounted, as well as files within a mounted filesystem. I thought the VFS only cached mounted filesystems? If the dd is using something like "if=/dev/dasda of=dev/dasdb" then I would have thought that the cache would not be used. The cache is only used for mounted filesystems, i.e. files/blocks referenced within the FS via the mountpoint. mark ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390 __________________________________________________________________________________________________ CONFIDENTIALITY NOTICE: This email from the State of California is for the sole use of the intended recipient and may contain confidential and privileged information. Any unauthorized review or use, including disclosure or distribution, is prohibited. If you are not the intended recipient, please contact the sender and destroy all copies of this email.
