Discussion:
Two node failover with shared storage and Luns in active/passive
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Amjad Syed
2016-08-29 13:23:33 UTC
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Hello,
We have implemented a two node failover cluster using RHEL pcs in active
passive mode
We have shared storage with one LUN,
Our concern is what if this LUN fails or there is hardware problem
accessing the data in it.
What is the best way to synchronize data between two LUNS ? any suggestion
will help.

Thanks,
Amjad
Rick Stevens
2016-08-29 17:17:18 UTC
Permalink
Post by Amjad Syed
Hello,
We have implemented a two node failover cluster using RHEL pcs in
active passive mode
We have shared storage with one LUN,
Our concern is what if this LUN fails or there is hardware problem
accessing the data in it.
What is the best way to synchronize data between two LUNS ? any
suggestion will help.
If you have two identical LUNs, you could run something like drbd to
mirror one LUN to a backup:

https://www.drbd.org/en/comp/drbd-linux-driver

Note this is done at the block level. It doesn't look at filesystem-
specific stuff, it just watches block-level disk writes to the primary
device and replicates those to the backup over the network.

There are other things you can do at a filesystem level, such as
rsyncing often, corosync, etc.

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Debjyoti Banerjee
2016-08-29 18:53:32 UTC
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Hi Amjad,
You should try glusterfs.

Regards,
DJ
Post by Amjad Syed
Hello,
We have implemented a two node failover cluster using RHEL pcs in active
passive mode
We have shared storage with one LUN,
Our concern is what if this LUN fails or there is hardware problem
accessing the data in it.
What is the best way to synchronize data between two LUNS ? any
suggestion will help.
Thanks,
Amjad
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https://www.redhat.com/mailman/listinfo/linux-cluster
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