<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body><div><div style="font-family: Calibri,sans-serif; font-size: 11pt;">How Metadata updates after data IO completion done? Write back mode does not support synchronization?<br><br>Is there any other feature ??</div></div><div dir="ltr"><hr><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">From: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;"><a href="mailto:david@fromorbit.com">Dave Chinner</a></span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">Sent: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;">07-07-2015 05:59</span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">To: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;"><a href="mailto:patelrakeshcomp@gmail.com">Rakesh Patel</a></span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">Cc: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;"><a href="mailto:xfs@oss.sgi.com">xfs@oss.sgi.com</a></span><br><span style="font-family: Calibri,sans-serif; font-size: 11pt; font-weight: bold;">Subject: </span><span style="font-family: Calibri,sans-serif; font-size: 11pt;">Re: regarding journaling mode</span><br><br></div>On Mon, Jul 06, 2015 at 11:38:32AM +0530, Rakesh Patel wrote:<br>> Hi,<br>> <br>> I come to know XFS is using writeback journaling mode.<br><br>Can you explain how you came to that conclusion?<br><br>> As per the<br>> journaling guide, writeback is unsafe which does not preserve data and<br>> metadata write synchronization.<br><br>What journalling guide would that be? Please quote your sources when<br>asking questions.<br><br>> I really want to know reason behind to choose writeback mode for journaling<br>> in XFS.<br><br>Metadata updates after data IO completion are used instead of<br>ordering data writeback operations through the journal.<br><br>Cheers,<br><br>Dave.<br>-- <br>Dave Chinner<br>david@fromorbit.com<br></body></html>