Sol
Storage is cool
It's the Something Random thread... Doesn't that mean that in this case the signal is noise, and the noise signal?
Does it normally take a long time for a software based RAID 5 array to be built? I just setup OpenFiler with their software RAID using my five 1.5TB drives as a single RAID 5 volume. The array is busy building for the first time and it's been running since 6:00AM Sunday morning and it's only at 83% complete (~30 hours). I'm assuming it does take a while to initially build the array for the first time? The activity lights have an interesting pattern with 4 of the 5 drives blinking fast and one staying a bright solid...but it shifts around.
Raid 5 doesn't have a drive that stores CRC / Parity data. The parity data is spread across all the drives. My RAID5/6 arrays on the Dell PERC cards built arrays with 6 or 8 1.5TB 5400RPM drives in less than 5 hours.Yup, that is the expected behavior. I've had arrays take a week to rebuild. The drive that is pegged is the one storing the CRC data, it will cycle through all the drives eventually.
PERC 6/I Integrated / Adapter 3Gb/s SAS PCI-Express 1.0 2x4 internal 256MB Yes (BBU) 0,1,5,6,10,50,60 16 Hardware RAID
Raid 5 doesn't have a drive that stores CRC / Parity data.
Does it normally take a long time for a software based RAID 5 array to be built? I just setup OpenFiler with their software RAID using my five 1.5TB drives as a single RAID 5 volume. The array is busy building for the first time and it's been running since 6:00AM Sunday morning and it's only at 83% complete (~30 hours). I'm assuming it does take a while to initially build the array for the first time? The activity lights have an interesting pattern with 4 of the 5 drives blinking fast and one staying a bright solid...but it shifts around.
You just remove it from the carrier and put a normal PCI bracket on it. linkStereodude, does yours look like this:
I can't seem to find the Perc 6 card that looks like a normal PCIe card.
That would be RAID-3 or 4. RAID-5 has always had distributed parity as far as I'm aware.That depends on how it implements RAID 5. The older approach involves each stripe being composed of n-1 drives in (essentially) RAID 0 with the last drive in each composing CRC info. The drive that stores CRC info does cycle from drive to drive for each stripe. This was the main performance bottleneck for larger arrays (the write speed on the single CRC drive). IIRC, more sophisticated controllers took to dividing up all the CRC information and writing a part of it on each drive along with the data, reducing the bottleneck, but at the cost of significant complication on the computation side.
That would be RAID-3 or 4. RAID-5 has always had distributed parity as far as I'm aware.
Meh. Who else has had two hours of sleep since Sunday morning at 9AM.
Not Seagates by any chance? There are several that really shit the bed when asked to work in a RAID 5 config. I don't think a new controller will help in that case.
You just remove it from the carrier and put a normal PCI bracket on it. link
Yes, that's it. I bought cables from ebay pretty cheap. I bought the cards from a forum member at overclock.net ~$100 each with battery backup and they did not come with cables. I'm not sure if the cards from Dell come with cables or not. I'd guess not.
I'm using XP x64.
Yep.
So Dave, I guess this means you'd fail Chewy's job criteria (like the rest of us)?
The same exclusions apply as above and that gives two remaining choices
m n o p q
1 3 4 2 5
3 1 4 2 5
So one needs one more test. There are a variety of choices for that one test: m>n; n>m; m>p; n>p and the coresponding < tests
In an interview, with no pencil and paper avail and just using my memory with no visualization of the problem I don't think I would have solved it while under the gun either.
Senior level technical consultants, the level before it goes directly back to a software developer for assistance in solving the problem. (Not your level 1 or level 2 staff).Which sort of jobs require that sort of mental masturbation? Are they entry level positions?