You know that hpacucli (and MegaCli on LSI-based hardware RAID systems)
can usually tell you more about the array and the drives than mdadm can,
right? Also, if you're doing parity, having hardware RAID moves the
parity calculations to a dedicated ASIC, avoiding any load of note on
the CPU. Also, with hardware RAID, you get battery-backed or
flash-backed write-back caching, which can dramatically improve performance.
That said, mdadm is better that cheap fake-RAID controllers like you
find on most mainboards, I will give you that.
digimer
On 21/08/14 04:33 PM, GKH wrote:
> Hate to change the conversation here but that's why I hate hardware RAID.
> If it was software RAID, Linux would always tell you what's going on.
> Besides, Linux knows much more about what is going on on the disk and what is about to happen (like a megabyte DMA transfer).
>
> BTW, check if something is creating:
>
> /forcefsck
>
> That would make the fsck run every time.
>
> GKH
>
>> Matt wrote:
>>> I have CentOS 6.x installed on a "HP ProLiant DL380 G5" server. It
>>> has eight 750GB drives in a hardware RAID6 array. Its acting as a
>>> host for a number of OpenVZ containers.
>>>
>>> Seems like every time I reboot this server which is not very often it
>>> sits for hours running a disk check or something on boot. The server
>>> is located 200+ miles away so its not very convenient to look at. Is
>>> there anyway to tell if it plans to run this or tell it not too?
>>>
>>> Right now its reporting one of the drives in array is bad and last
>>> time it did this a reboot resolved it.
>>
>> You need to know what it's running. If it's doing an fsck, that will take
>> a lot of time. If it's firmware in the RAID controller, that's different.
>> You can run tune2fs /dev/whatever and see how often it wants to run fsck.
>> For that matter, what's the entry in /etc/fstab?
>>
>> mark
>>
>> _______________________________________________
>> CentOS mailing list
>> CentOS@xxxxxxxxxx
>> http://lists.centos.org/mailman/listinfo/centos
>>
>
>
> _______________________________________________
> CentOS mailing list
> CentOS@xxxxxxxxxx
> http://lists.centos.org/mailman/listinfo/centos
>
--
Digimer
Papers and Projects: https://alteeve.ca/w/
What if the cure for cancer is trapped in the mind of a person without
access to education?
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos
