EXT3-fs: barriers not enabled
Hi GRML. I appreciate your system, have been using since 2008. Recently learned about persistency which I plan to use to replace custom initramfs for booting & maintenance of RAID1/LVM2 systems containing root partitions.
I just finished migrating Gentoo from single partition to mirrored ( RAID1 ) and LVM2 volumes. In the process, I learned/realized that the Ext3 filesystems contained within raid/volume group are not enabling write barriers despite being told by fstab to do so. This is 2.6.36 kernel with lvm2 version 2.02.73. I thought to try to grml 2010.12 as well, but problem remains.
My question: is there any magic "Start" besides mdadm-raid, lvm that should be necessary ? We can otherwise mount partitions without incident. Does somebody have ext3 barriers enabled by default such that I know it should be realized with 2010.12 ?
Appreciatively,
Sven
Sven,
On Tue, Jan 18, 2011 at 2:22 AM, Sven Crouse svenc@snet.net wrote:
I just finished migrating Gentoo from single partition to mirrored ( RAID1 ) and LVM2 volumes. In the process, I learned/realized that the Ext3 filesystems contained within raid/volume group are not enabling write barriers despite being told by fstab to do so. This is 2.6.36 kernel with lvm2 version 2.02.73. I thought to try to grml 2010.12 as well, but problem remains.
This probably means that the underlying blockdevice does not support write barriers. 2.6.36 should support write barriers in the md and dm layers, but your underlying block device still has to support that, too.
My question: is there any magic "Start" besides mdadm-raid, lvm that should be necessary ?
No.
You could try running your test with a stock Debian kernel and see if it works there, just to do a quick verification.
Cheers, Christian
Teilnehmer (2)
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Christian Hofstädtler -
Sven Crouse