On 31 August 2007, Feizhou <feizhou@xxxxxxxxxxxx> wrote:
> Message: 77
<snip>
> Whoa there!
>
> Hardware raid + battery backed up memory cache in raid 1,10 mode is
> hard to beat with software raid and hardware raid offers data
> integrity guarantee beyond software raid.
>
> If you were planning a huge array especially a raid5 array, then
> software raid may be better. Hardware RAID cards all come with memory
> caches now so their throughput is no longer limited.
>
> Another route you can go is getting a PCI/PCIe/PCI-X BBU RAM/NVRAM
> card to put an external journal on to speed up fsync performance for
> filesystems like ext3 over software raid since these cards can go
> beyond 1GB of memory unlike hardware raid cards that usually max out
> at 256MB.
>
> Software RAID is also good if you need to be able to transfer the
> disks to another box that does not have a hardware raid controller or
> the same controller.
>
Feizhou: THANK YOU! What you wrote is *extremely* helpful (and
educational) for me! MUCH appreciated! Lanny
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos
