[Linux-HA] Raid and drdb
denk at us.es
Mon Jul 27 11:14:57 MDT 2009
we have now almost configured our hardware for a HA cluster. We will use
two IBM 3550 M2 servers, and I would like to ask you if you could share
some experience about different disk configurations.
1) Using drdb, is having some hardware RAID on both machines good
practice (for example 3 disks with RAID 5) or is it not necessary to do
so as drdb is our network raid? I guess in case of failure of the drdb
communication it would be good to have some additional raid security on
each server. Does it affect the write performance a lot?
2) This machine has a maximum of 4 SAS slots, what would be good
practice to install OS and data (2+2 disks with raid 1, or everything on
3 disks raid 5, o 4 disks raid 10?) Of course disk price is an issue, we
would like to have 500 GB of data, which requires 3 300 Gb disks for raid 5.
Thank you very much for any experience you can share!
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