On Monday 27 July 2009 12:14:57 Claus Denk wrote: > Hi all, > > 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?
<mee too> Actually, I'd like to know: what happens when a disk fails? Would that propagate to DRBD and trigger a failover? > 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. With SAS drives you should be OK with raid 5 (SATA is where you'l want raid 1/10, apparently). Personally, I wouldn't worry too much about raid'ing the root drives: HA cluster should give you enough time to reinstall the OS if one fails. I would keep a spare disk handy. Dimitri -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu _______________________________________________ Linux-HA mailing list [email protected] http://lists.linux-ha.org/mailman/listinfo/linux-ha See also: http://linux-ha.org/ReportingProblems
