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Document BLOCKIO regression on kernels 2.6.32+

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@1920 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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Vladislav Bolkhovitin
2010-08-03 16:59:37 +00:00
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@@ -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