FreeBSD 9.0 & LSI MegaRAID SATA problem

Bas Smeelen b.smeelen at
Tue Jul 10 10:39:59 UTC 2012

On 07/10/2012 12:26 PM, Wojciech Puchar wrote:
>> That's clear to me.
>> These "hardware" raid controllers are not very reliable because they are 
>> indeed not real hardware raid controllers, but software based.
>> Maybe for desktop usage it's ok/ good enough?
> precise what is "desktop" usage is.

Here at work we just use non raided disks for workstations which run linux.
The home directories are on nfs, so when a disk fails it's replaced very 
fast by doing a basic install on a new disk or just replacing the disk by a 
preinstalled disk laying on the shelf here.

> i don't see a reason for doing mirroring for home use.

Me neither, just keep back-ups of important data on a different place/device

>> It is better to use the operating systems raid capability linke gmirror 
>> instead.
> always.
>> Of course real hardware raid controllers with cache and battery backed 
>> are a different thing and very reliable.
> if you have workload where battery backed cache will actually improve 
> things (heavy fsync usage) then yes. otherwise no.
> i've seen many of them, older, newer, and with same disks i always got at 
> least same performance with FreeBSD software solution.
> Not talking about RAID5 of which i am not interested at all - there is no 
> reason trading performance for available space nowadays with 2-3TB disks.

I have never tries the FreeBSD raid solution as we always have servers with 
from past to now acc, amr and mfi controllers with raid1 and raid5 in the 
past mostly used for databases and perl cgi based web applications.


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