[CentOS] Recommendations for a “real RAID" 1 card on Centos box

Fri Mar 14 19:08:59 UTC 2008
Les Mikesell <lesmikesell at gmail.com>

John R Pierce wrote:
> Robert Arkiletian wrote:
>> On 3/10/08, nate <centos at linuxpowered.net> wrote:
>>> You can turn on write back caching if you have a UPS as well
>>>  (provided your UPS is wired into your system for a graceful shutdown)
>> Hopefully you have a redundant PS unit. Having a UPS is not going to
>> help if your PS fails.
> redundant power supplies connected to redundant UPS's.   I've seen more 
> UPS failures than I've ever had failed PSUs on proper server grade 
> hardware.

Exactly - You can expect a UPS to need new batteries every few years, 
but I had one machine with a 4+year uptime (and only because I was able 
to move power cords, change UPS's, and swap it's mirrored hard drives on 
the fly).  The machine is still running (RH 7.3) but it's less critical 
now and I was too lazy to drag along a UPS when I had to move it to a 
different location.

   Les Mikesell
    lesmikesell at gmail.com