[luau] videl.ics.hawaii.edu disk failure - Your Help Needed

[Brian Chee]

Beware, I've just been burned by the Promise ATA/133 RAID controller...it
will only rebuild the array if you give a new drive of identical
geometry....unlike SCSI based raid which only need a similar or larger sized
drive.

I'm exploring 3ware's offerings and am enthusiastic about their SATA based
RAID controllers...should give similar performance to 1gb/sec Fiber Channel
but for a heck of a lot less money.

Once I get one running, I'll report back to the list....oh yeah, 2gb Fiber
channel is truly wonderful stuff under redhat....I used Qlogic HBA's and
they scream....

/brian chee

University of Hawaii ICS Dept
Advanced Network Computing Lab
1680 East West Road, POST rm 311
Honolulu, HI  96822
808-956-5797 voice, 877-284-1934 fax

----- Original Message ----- 
From: "Thomas Ryan Gordon Sr" <memeyou at memeyou.net>
To: <luau at videl.ics.hawaii.edu>
Sent: Thursday, December 04, 2003 10:32 AM
Subject: Re: [luau] videl.ics.hawaii.edu disk failure - Your Help Needed


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> R.Scott Belford wrote:
>
> | I am saddened
>
> Don't be sad, I was just learning that the RAID is in-fact
> software-based and all 160 gigs will be usable.  The more hard-drives,
> the merrier.
>
> But back to the tech stuff.  I just had a thought about videl but I
> could certainly be thinking wrongly with my limited knowledge about videl.
>
> ~    "Software-RAID, by its very software nature, tends to be more
> flexible than a hardware solution. The downside is that it of course
> requires more CPU cycles and power to run well than a comparable
> hardware system."
>
> Does videl have an available PCI slot?  If we still got the low-end
> 60G (and it still fits) and spent $20 on a ATA RAID controller we
> could stop doing the software RAID thing and improve performance and
> reduce CPU usage.  It was my understanding that videl is worked very
> hard in cpu/memory.
>
> In my limited experience, i've only compared the performance benefits
> of moving software->hardware using SCSI so I am uncertain about the
> level of benefit of moving to true RAID via IDE.  Also these RAID 0/1
> controllers may be so low-end that they may not even be comparable to
> today's software implication in Linux.
>
> Of course, thats a lot of drives and videl would at least have to be a
> 2u or a very fancy 1u to fit them all in or have a ballsy PSU.
>
> Tom
>
> Tom
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