From 556839b8176613a571e3154a1d23b7b14ee22d09 Mon Sep 17 00:00:00 2001 From: Vladislav Bolkhovitin Date: Tue, 3 Aug 2010 16:59:37 +0000 Subject: [PATCH] Document BLOCKIO regression on kernels 2.6.32+ git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@1920 d57e44dd-8a1f-0410-8b47-8ef2f437770f --- scst/README | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/scst/README b/scst/README index 84a3e6ee7..ef54390ce 100644 --- a/scst/README +++ b/scst/README @@ -1444,6 +1444,11 @@ IMPORTANT: Since data in BLOCKIO and FILEIO modes are not consistent between simultaneously, you will almost instantly corrupt your data on that device. +IMPORTANT: Kernels starting from 2.6.32 have a problem, which prevents BLOCKIO +========= from working with RAID5/DM. See http://lkml.org/lkml/2010/7/28/315. + Hopefully, it will be fixed soon. Meanwhile, it is recommended to use + kernels below 2.6.32 for BLOCKIO on RAID5/DM devices. + IMPORTANT: If SCST 1.x BLOCKIO worked by default in NV_CACHE mode, when ========= each device reported to remote initiators as having write through caching. But if your backend block device has internal write