On Tue, May 02, 2000 at 08:29:39AM -0500, Robert M. Hyatt wrote:
> I disagree here. I have a power-edge 6300 with 4x36 gig drives in a
> raid-5 array using the megaraid card. For testing, I made this a
> 3x36 raid-5 array with the 4th drive set up as a hot spare. I copied
> a bunch of files to this thing, pulled one of the three drives out while
> the system was up, and watched. It started beeping. I could still
> access all the files. I hit the power button, and then powered back
I did the same test
> up. The beeping continued. I continued to be able to access the drive.
> (configured as one huge partition). After about 45 minutes, the beeping
> stopped. I powered down again, went into the raid bios, checked the
> status, and found my hot spare was now re-mapped as the 'missing drive'.
> I plugged in the old drive, made it the hot spare, booted, and
> everything still ran fine. No errors. No hangs.
Indeed. No errors, no hangs.
But somehow the following test occured:
Drop a disk (don't ask...).
Put it back in, and reboot the computer.
Luckily the hang bug on a broken disk has been fixed in on of those many
bugfix releases.
Now there are some others.
Consider this:
How are you going to setup and initialize, say, ehh 600 systems with these
raid controllers?
Using the megamgr? That is a joke! (Actually we wrote some megamgr ourselves
that understood scripting, fixed a bug on the way in the megaraid.c)
> This card appears to have 128mb of DRAM, and so far, it seems to be
> very fast...
> I don't want my cpus busy chugging around computing parity and repairing
> the data when a drive goes down. I'd rather let the hardware controller
> handle that.
So you actually tried and COMPARED the speed difference, comparing disk
speed as well as cpu speed?
It seems either I need a VERY expensive raidcontroller to get my quad xeon
to do something, or I get my quad xeon to do something, and improve
overall system speed.
> Just an opinion, but for me hardware raid seems to work fine.
Don't think I'm attacking you on your experiences. Raid seems to work for
you. But if you're system is slow and idle, you really need to consider
soft-raid. (And need a good look at the required drivers...)
But I'm going to take a look at this power-edge 6300...
One question: does it do around 20...30 MB/s block read/write
(using Bonnie++)?
--
intel1: 3:39pm up 17:02, 2 users, load average: 1.05, 1.02, 1.00
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