On Tue, 17 Apr 2001, Jason A. Lixfeld wrote:
> Should I stay away from ReiserFS if I'm going to go with Software RAID 5?
> The fact that the filesystem doesn't need to be fscked is amazing, but it's
> taking 3 days to resize_reiserfs -s -60G from an LV right now so I assume
> resizing a reiserfs'd raid 5 will be the same? Also, I saw a benchmark with
> the 2 3Ware cards illustrating that RAID 5 with ReiserFS performed EXTREAMLY
> poorly compared against an the same ext2 RAID 5 configuration. Can you
> confirm/deny this? I'm going to be using 3-4 Promise Ultra100 cards, not
> 3Ware, but I just want to know the benchmarks if anyone has any.
>
I also noticed this, ReiserFS with Software Raid 5 is extremly slow. I wonder
if there are any options to tune ReiserFS like the stride option in ext2?
> How long does it take to resynch or rebuild if you add a drive/have a
> failure and need to rebuild to the hot spare?
>
This depends on how much activity you have and the size of the array, but you
can tune this very nicely in /proc/sys/dev/md/speed-limit (can´t remember the
location for 2.4.x). And here you can set it to a maximum of what your disk
can manage.
> FINALLY (promise) I hear there are certain rather hefty CPU/RAM requirments
> for Software RAID 5. How do you generally need for a 500+GB Software RAID
> 5?
>
RAM requirements in my opinion is very low. I have a very busy 32 GB Software
Raid 5 here and cannot say that it is eating much of my CPU time. This
rumor that Software Raid eats lots of CPU time, in my opinion, is no longer
true.
Holger
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