The Logic Off Topic list

--- In logic-ot@yahoogroups.com, Peter Ostry <po@...> wrote:

> Anyway, to keep you from getting bored :-) here are some thoughts
> about that setup:
>
> Three drives are the minimum for a RAID 5. You cannot have a "hot
> spare" in such a set, which would automatically jump in if one drive
> fails. You could set it up with 4 or five disks and one or two hot
> spares. BUT - the RAID might get remarkable slower if one drive
> fails. I do not know if one can record in such a situation.
> Furthermore, if you are really forced to recover the data (and you
> are in my opinion) you are most likely unable to record on that RAID
> for an hour or more while it rebuilds the set. And these controllers
> have no mercy and are definitely unpatient: one wrong answer from a
> drive and the switch it off immidiately. That just as explanation
> that you are still not on the safe side for an outdoor job.
>
> Please be aware that we don't talk about a setup for everyone but
> about as much security as possible for a (I think) given budget.
> Therefore we have to apply a higher level of criticism and to be more
> scared than necessary.
>
> It depends how you use that setup. If time is critical, outdoors or
> inhouse, it could be better to setup two mirrors because they don't
> lose speed after a drive failure (just my 2 cents).
>
> If you do many location recordings without delivering the playback a
> RAID 5 could still be perfect if you keep enough space free on the
> system mirror or carry a spare drive with you. On a bad day that can
> save your ass because although you have no security you CAN record
> that way. And no security at one occasion is not as bad as it sounds.
> Thousands of people are used to record that way :-)
>
> ___
> Peter Ostry
>

Hey Peter I was looking at some help files on my Mac and ran across this after reading
your raid post again . thought you might be interested:
After you create a RAID set, the RAID software manages storing files on the disks in the set
for you.

If you have sufficient disks, you can create more than one RAID set. For example, you can
set up one set as a mirrored RAID set to provide data redundancy, and another set as a
striped RAID set to provide faster performance.

I guess we found out two things about my mac  1) you can have two different raid set-ups
and 2) I guess it is a software controller on here