Thank you for the wise council to carefully check my code. I certainly intend to do that. However, I am able to reproduce the symptom using the standard dm-linear module supplied with the x86_64 kernel that comes with Ubuntu Karmic. With the attached script, the first 'od' on /dev/vg1/lv1, done before 'dmsetup remove', shows the first part of the file contains 0x00. A second 'od' after 'dmsetup remove' shows the file contains random data. I didn't see any queues or caches in dm-linear that would need to be flushed. Any other suggestions? Thanks, Robert Riches Azad Consultant at Intel -----Original Message----- From: Alasdair G Kergon [mailto:agk@xxxxxxxxxx] Sent: Wednesday, June 30, 2010 4:08 PM To: Riches Jr, RobertX M Cc: Dm-Devel Mailing List Send-To Address (dm-devel@xxxxxxxxxx) Subject: Re: Is there a way to see updated contents of a DM target's underlying device while the DM target is in use? Sounds like a coding problem you need to debug...check your device stack - and the code you are using to look for the change - carefully, check where you are queueing/flushing/caching etc. Alasdair
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Description: test02linear
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