environment
Novell SUSE Linux Enterprise Server 10
Novell SUSE Linux Enterprise Server 9
Novell Open Enterprise Server (Linux based)
Novell SUSE Linux Enterprise Desktop 10 situation
ERROR: JBD: barrier-based sync failed on sda1 - disabling barriers" or, in general: JBD: barrier-based sync failed on storage_device - disabling barriers
resolution
This message is primarily an informational message; it does not indicate a problem.
Suppress this message globally
To suppress this message globally, pass the parameter
barrier=off
to the kernel when booting (e.g., when using the GRUB boot loader, through /boot/grub/menu.lst). This will cause the kernel not to attempt to use the transaction barrier mechanism.
Suppress this message for one filesystem
To suppress this message for one particular ext3 filesystem, use the mount option barrier=0 when mounting the filesystem.
additional notes
Background
By default, the Linux kernel will try to use transaction barriers.
Transaction barriers are an additional mechanism to help maintain data
integrity. In general, modern storage subsystems may cache writes and
may occasionally reorder pending writes in order to increase write
performance. While this is fine in general, it is not desirable when
handling journal data for journaled filesystems. With journal data,
metadata updates, that is updates to the journal, should be written out
to the storage prior to the regular data they are associated with, to
make true crash recovery possible.
The informational message
indicates that the storage driver and/or the storage device do not
support transaction barriers. Under normal operation, this does not
compromise data integrity. However, barriers do provide a greater
degree of performance for journaling file systems and help ensure data
is correctly written out to the disk.
"JBD"
in this message refers to the Journaling Block Device, an abstraction
that was developed to provide the journaling capabilities of the ext3
filesystem on top of the infrastructure of the ext2 filesystem on which
ext3 is based. JBD is now used by the OCFS2 filesystem as well.
document
Document ID: | 3907838 |
Creation Date: | 2006-10-04 03:24:43.0 |
Modified Date: | 2006-10-04 03:24:29.0 |
Novell Product: | Open Enterprise Server |
Novell Product: | SUSE Linux Enterprise Desktop |
Novell Product: | SUSE Linux Enterprise Server |
Novell Product: | SUSE Linux |
disclaimer
The
Origin of this information may be internal or external to Novell.
Novell makes all reasonable efforts to verify this information.
However, the information provided in this document is for your
information only. Novell makes no explicit or implied claims to the
validity of this information.
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