[CentOS] Re: Recommendations for a real RAID 1 card on Centos box

2008-03-14 Thread Scott Silva

on 3-14-2008 8:22 AM Therese Trudeau spake the following:
That brings up a last question on possiblity of either a 
3ware or acrea RAID 1 cards.  I'm wondering how long I would 
be able to order
a replacement RAID card from either of 3ware or areea.  
Anyone know if 3ware or acrea stock identical replacement 
cards for their SATA 4 port raid cards
for several years out?  Do they stock past the three year 
warranty period?
ACTUALLY I totally forgot.  I absoluteluy can not use 
software raid.  Because I use Adobe products.  Adobe products 
do not install
well on software raid systems, and tend to crash on software 
raid beacuse of their activation process.  If I go raid, I 
absolutely need a hardware raid
which is entirely transparent to the operating system, at 
least as far as adobe products are concerned.

What Adobe products do you use under Linux? I did not know
that Adobe offered products outside of Reader and Flash
for Linux.

Besides, where did you read that Adobe products don't
work on RAID systems?

The RAID part will be well hidden under the Logical Volume
Manager even if the first is true.

RAID1 can speed up sequential read speed, as a well
designed RAID implementation can stripe the read requests
across both spindles (and dm-raid does that!).


Ah I figured someone would ask that.  I use pretty much all major adobe 
products, Photoshop,
Illustrator, Flash, just about the entire suite.  


I have two home workstation machines.
One is Centos, and one is Windows (the one I use Adobe on).  I'd prefer if 
possible
to have the same type of RAID cards on both machines, because easier to
manage and if I ever decide to sell or give away one machine, I can pull 
the raid card and use it as a backup.



From experience I have learned that Photoshop will not install on software raid 
on my W2K machine - I tried it

two years ago, could not get it to install, and after a few days trying to get 
it to work, called
Adobe tech support and at that time the tech support person told me
that their products don't run on software raid because they don't want people 
having
multiple copies of one license on a second drive (unless it's for their
second copy allowance for a laptop or second machine owned by same person,
and only one or the other - the laptop or second desktop are run at the same 
time -
my second copy is on a laptop ).

Also I may at some time migrate my adobe products to the
Linux machine and run Adobe on WINE on the Linux box.  Google
just started working with the folks over @ WINE, and they want
to make it so all adobe products run flawlessly on Linux - WINE, not just
photoshop and illustrator.  Today some adobe products run on wine well, some 
don't,
in a few years they all will run well on a linux box using WINE.  I'm not sure 
about running adobe using software raid on a linux box and WINE - never tried it, but going with

hareware raid on the linux box eliminates another possible unknown.
_
The software raid implementation in windows is a far cry from the linux 
version. Windows can't boot from their dynamic arrays, linux can. And the 
raid in linux is more transparent to the software, as the linux raid is just 
another device as far as the software is concerned. The kernel keeps full 
isolation and control.
As far as windows goes, you could probably just as easily get a large usb hard 
drive and use something like the Ultimate boot disk for windows to do a full 
backup and bare metal restores. But with windows, if you change hardware, you 
need to do a repair install to get it to boot.


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Re: [CentOS] Re: Recommendations for a real RAID 1 card on Centos box

2008-03-14 Thread Les Mikesell

Scott Silva wrote:



_
The software raid implementation in windows is a far cry from the linux 
version. Windows can't boot from their dynamic arrays, linux can.


When did that start - or are you just looking at the non-server 
versions?  I don't have it around now, but I'm fairly sure I was able to 
take a windows 2000 server and have it clone itself to a VMware 
appliance setup that first exported an iscsi partition, then after the 
software mirroring completed, booted from it.  And unlike linux, the 
windows version was able to convert a running non-mirrored partition 
into a dynamic disk, and then mirror it.


And 
the raid in linux is more transparent to the software, as the linux raid 
is just another device as far as the software is concerned. The kernel 
keeps full isolation and control.


I don't remember seeing anything change after the disk conversion in 
windows.


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[CentOS] Re: Recommendations for a “real RAID 1 card on Centos box

2008-03-10 Thread Scott Silva

on 3-9-2008 5:36 PM Therese Trudeau spake the following:

So these cards are just plug n play?  Just plug them in, no software or
drivers required,
all mirroring is managed by firmware built into the card RAID card itself?

Drivers are required for all storage adapters(RAID or not). 3Ware
handles raid in hardware, not in software, it has a bios which
you'd typically use to configure the array, you can boot off of
the array, etc.

3Ware also offers a management tool for linux (CLI and/or web
based) which allows for monitoring, and controlling the adapter's
configuration settings.

3Ware has had their linux drivers in the kernel for at least...
8 years now? maybe longer. So any linux distro should have no
trouble detecting the card. The latest 9650 cards are pretty
new and use a new driver, which may or may not be supported,
CentOS 5.1 should work with it fine though(support for CentOS 4
was added almost a year ago, I think with v4.5)

They also support hot swap, provided the interface to the disk
supports it(typically a hot swap backplane).


Great thanks for that info Nate, I just checked out their web site, looks like the 9500S-4LP would suit my needs 
for a desktop machine.


I've been leary about desktop RAID cards because a few years ago, I bought an 
adaptec 1210SA RAID card which supposedly does
RAID 1  I never could get the darn thing to work in my old windows machine and 
years later found out it is really a fake raid card.  It's been collecting dust 
ever since
may as well throw it out.  The drivers it required never worked with W2K.

But the Centos server I use has adaptec SCSI RAID controller in it, I guess on 
the high end for SCSI RAID, adaptec is known for good raid cards, but the one I 
bought sure did nothing for me
for my desktop.

_


Adaptec makes both true HW raid and re-sells fakeraid cards. I guess they 
wanted a piece of both pies. But 3ware only makes HW raid cards AFAIK.


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