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RAID1 replace broken HDD

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If you see something like this on your monitor or in your logs, you should worry about your important data.

And immediately change your HDD!

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ata1.00: exception Emask 0x0 SAct 0x0 SErr 0x0 action 0x6 frozen
ata1.00: failed command: FLUSH CACHE EXT
ata1.00: cmd ea/00:00:00:00:00/00:00:00:00:00/a0 tag 0
res 40/00:0c:b9:68:55/00:00:05:00:00/40 Emask 0x4 (timeout)
ata1.00: status: { DRDY }
ata1: hard resetting link
ata1: link is slow to respond, please be patient (ready=0)
ata1: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata1.00: configured for UDMA/133
ata1: EH complete

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DRBD master/slave setup

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In the last time I get a lot questions and feedback to some older posts (Active/Passive Cluster) where I used DRBD. And actually I never wrote how to setup DRBD and I try to fill this gap now. Also this post will be a new ground for some new ideas and posts related to Active/Passive Clustering with KVM.

DRBD (Distributed Replicated Block Device) is a really cool cluster solution to have radundant data on two or more nodes. Everybody know RAID, DRBD is like RAID 1 over network.
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Increase number of disk mounts

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Many home users power off their home computers and servers when they are not being used. Each of you had already this problem, you need very quickly your PC or server and you press the power-ON button and now you can wait.
File system Check!
The check seems to take forever, you can go and make coffee, and the system boot won’t resume until the check is over. [Read more…]

NIC PROMISC mode

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It was a little bit strange situation, I found my outer interface in a PROMISC mode.
“ip a” or “ifconfig” output shows that my eth0 interface was in the PROMISC mode, but I don’t understand, why?

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eth0: <broadcast,multicast,promisc,up,lower_up> mtu 1500 ...
</broadcast,multicast,promisc,up,lower_up>

I don’t used tcpdump or similar tools in this moment.
After I spend some time to my favorite search engine, I found how to disable manually this mode:

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ifconfig eth0 -promisc