On Wednesday, 3 January 2001 at 13:30:50 +1100, Zero Sum wrote:
> On Wednesday 03 January 2001 10:21, Alfred Perlstein wrote:
>> * Thomas Seck <[EMAIL PROTECTED]> [010102 14:00] wrote:
>>> Hi all,
>>>
>>> sorry if this is OT for -stable, but I followed the discussion about
>>> vinum in here and got a bit worried.
>>>
>>> I am currently deploying a proxy server for our company. It shall use
>>> squid on 4.2-STABLE. I would like to put the cache data on a vinum RAID
>>> 0, made of three U160 disks. As I understood the discussion so far,
>>> there are some unresolved problems with the raid 5 code. Could someone
>>> tell me whether I can safely use vinum for building a raid 0 system
>>> (despite the fact that the HW may be a point of failure of course)?
>>>
>>> Thanks in advance and best regards from Germany
>>
>> We've been using RAID-0 and RAID-1 with vinum here for a long time,
>> the only problem we had was during a 3.x->4.x upgrade, we were able
>> to recover from it after freaking out for a bit though.
>
> I know it is a bit off topic and if it has been discussed to death befire,
> I apologise. But for the lfe of me I can't see why anyone would use RAID 5
> as other than an acadaemic exercise.
>
> If this seems like a troll, I'm sorry, but I have had this argument so many
> time in RL. In the past I have always managed to get better performance by
> throwing RAID 5 out.
There are many reasons for using RAID. If you're looking for good
read/write performance, you won't use RAID-5. But if you have a web
server, for example, where 99% of all accesses are reads, then RAID-5
is quite a good choice. I do tend to agree that a lot of people use
RAID-5 where RAID-1 would be a better choice.
>> So yes, it is stable. I still wouldn't trust the RAID-5, but if
>> you want to get RAID-5 working you could take a shot on getting
>> some reproducable corruption/panics and let Greg know.
>>
> The lack of data may be because of it's lack of use as a general
> practice.
No, I don't think so. I'm surprised to hear how many people use it.
I'm reasonably sure that the problems people have reported are due to
a bug in Vinum, but I suspect it needs something else in combination
in order to make it appear. For a while there was a theory that you
need an fxp0 Ethernet card in the system, for example.
Greg
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