Mirror or Raid1? Replication or DRBD?
A poster setting up Informix on Linux asked whether OS-level software RAID1 or Informix mirroring performs better, and whether DRBD or Informix replication is better for a hot-standby server. Obnoxio The Clown preferred HDR. The poster liked replication, since the standby engine is already running, and was pointed to HDR rather than ER in the Administrator's Guide. No performance answer was given.
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I'm currently installing a new system (obvious due to prior postings). It's running on a Linux-OS, and I'm using software RAID1 for data security. Question is: What's better performance-wise, to use the OS-level mirroring, or let Informix do the mirroring? Also, as our customer plans on running a second server as hot-standby machine, we will configure DRBD to update a filesystem area - what's better there, DRBD or using Informix' replication features? Both from performance and security/reliability point of view? (with more weight on reliability of course) Tnx!
disposablegarry@googlemail.com said: > Also, as our customer plans on running a second server as hot-standby > machine, we will configure DRBD to update a filesystem area - what's > better there, DRBD or using Informix' replication features? Both from > performance and security/reliability point of view? (with more weight > on reliability of course) I'd personally prefer HDR, but that's just because I don't have the same level of history with DRBD. -- Bye now, Obnoxio "... no bill is required as no value was provided." -- Christine Normile
Obnoxio The Clown wrote:
> I'd personally prefer HDR, but that's just because I don't have the same
> level of history with DRBD.
I'm just now browsing through the IBM Informix manual on Enterprise
Replication ... is there a shorter HowTo somewhere? Or caveats that one
has to watch out for?
Using replication would be nicer (and I recon better on the safety side
as all changes are transaction-oriented in contrast to DRBD), as Online
is up and running even before HA does a switchover. With DRBD, oninit
has to run and start up the database during failover ... plus no
telling what happens to data when the master machine dies and only
partial transaction information is transfered ... (though the database
should handle it just as any regular machine crash I figure)
disposablegarry@googlemail.com said: > > Obnoxio The Clown wrote: >> I'd personally prefer HDR, but that's just because I don't have the same >> level of history with DRBD. > > I'm just now browsing through the IBM Informix manual on Enterprise > Replication ... is there a shorter HowTo somewhere? Or caveats that one > has to watch out for? Not ER, HDR ... High Availability Data Replication -- look in the Admin Guide. -- Bye now, Obnoxio "... no bill is required as no value was provided." -- Christine Normile