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PERC 5/i RAID Card: Tips and Benchmarks - Page 512

post #5111 of 7269
Quote:
Originally Posted by Jaco;12750045 
what is your chunk size...? 64K...?

From the graphs it doesn't seem like a bottleneck as it would be almost a straight line around 120MB/sec for example... Maybe it's a driver issue...

These are mine with 128K chunk and 512K block tests...

Edit: What are your controller and virtual disk settings...? Have you installed a BBU...?

raid5: block size=(number of disks-1)*(chunk size)
(3-1) * 128k = 256

"(...) for a more realistic result you have to multiply the above result by 2 or 3 in order to perform 2 or 3 sequential reads (...)"

So: 256 * 2 = 512 <<<<

Im using battery, and Adaptative Read Ahead ... Maybe WD RE2 GP are really slow hard drives in comparison with others ....
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post #5112 of 7269
Guys, I want some advice on my situation.
Currently I got a perc5i with 8x1.5tb seagate 7200.11 drives.
This means 10.5tb usable capacity and I have no more ways to upgrade than with OCE as all 8 slots are used.

Now my array is full and I need to do something. I can buy a 3tb drive and offload about 2tb on it that are not so important as to be protected, but this only gives me 2tb more to use.

If I considered upgrading the drives in Perc to bigger ones ( a painfull process as I'd have to find a way to temporarily store 10tb of data to be able to remake the array from the begining), then I think the perc has a 2tb/drive limit? Is that correct? Can this be bypassed somehow with new firmware/lsi one or something?
Does perc6 have the same problem? If so, is there any other cheap alternative that could use 3tb drives maybe?

Assuming the answer to the above questions is negative, then upgrading to 2tb drives would give me 3.5tb more storage in the end, I don't know if it's worth the hassle (to find a way to store the 10tb in the meantime), but assuming I do it, are the samsung F4 drives OK with perc? Because I can get them at a good price, but I have heard horror stories with "green" drives that go to some low power states and show as offline and make raid controllers go crazy...
post #5113 of 7269
@LuciferX, yes it's 512K for the testing block size... I've told you that maybe there's an other problem with your setup... You have to try another driver or check if your pcie is set to 8x, etc... I don't think that your drives are your problem, because they can't be that slow, it's impossible...

@Blinky7, I think you can't use more than 2TB with perc but check it out from the controller's specs...
post #5114 of 7269
Quote:
Originally Posted by Blinky7 View Post
Guys, I want some advice on my situation.
Currently I got a perc5i with 8x1.5tb seagate 7200.11 drives.
This means 10.5tb usable capacity and I have no more ways to upgrade than with OCE as all 8 slots are used.

Now my array is full and I need to do something. I can buy a 3tb drive and offload about 2tb on it that are not so important as to be protected, but this only gives me 2tb more to use.

If I considered upgrading the drives in Perc to bigger ones ( a painfull process as I'd have to find a way to temporarily store 10tb of data to be able to remake the array from the begining), then I think the perc has a 2tb/drive limit? Is that correct? Can this be bypassed somehow with new firmware/lsi one or something?
Does perc6 have the same problem? If so, is there any other cheap alternative that could use 3tb drives maybe?

Assuming the answer to the above questions is negative, then upgrading to 2tb drives would give me 3.5tb more storage in the end, I don't know if it's worth the hassle (to find a way to store the 10tb in the meantime), but assuming I do it, are the samsung F4 drives OK with perc? Because I can get them at a good price, but I have heard horror stories with "green" drives that go to some low power states and show as offline and make raid controllers go crazy...
I'm pretty sure only the H series cards can use more than 2TB drives. I read somewhere that Dell doesn't plan to release a firmware for the PERC 5/6 series that supports >2TB in the near future.
    
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post #5115 of 7269
Could anyone help me understand these weird drops in my raid card test performance. If you can see the following images I have sections where performance drops to 8-10mb/sec. Do I have a bad drive? Nothing turns up on smart scans, or when I ran hddtune on drives individually. I have the following setup:

Raid Level: raid 6 w/ 8xSamsung_F4_2TB
Stripe Size: 256k stripe
Disk Cache Policy: Enabled
Read Policy: Always Read Ahead (Adaptive not available under MSM 8.16)
IO Policy: Direct IO
Write Policy: Write Back
Default Write Policy: Write Back with BBU

2M test size:


4M test size:


8M test size:


Note: I was also wondering why my CPU utilization was up on these. I thought all that happened on the perc's internal processor. Anyway will be thankful for any insight, I just want to understand my setup and why/how it functions as best I can.
post #5116 of 7269
Quote:
Originally Posted by gamer_013 View Post
The array appeared fine in the megaraid software, I think.. It was online, but I didn't see that it was degraded anywhere, though I don't exactly know where to look to see if it's degraded.

When I came back to the computer after it happened (overnight) the Disk Management window was open and it was asking me to initialize the array to use MBR or GPT. So I don't really know what happened.

I've attached some pics of what the setup looks like
the easiest way to figure out what happened to your array when it "disappeared" is to export the controller's log and examine it. The controllers have built-in flash memory where it logs *all* activity in more detail than you would ever want. I only work with Dell servers and normally you do this via the 'omconfig' program... see if there is the equivalent to 'exportlog' with the LSI tools... the other source is to look at the system's log files... there might be something but it isn't going to be as detailed as the controller's own internal log.

if you're using non-RAID hard drives, it is possible that the controller decided your drives were non-responsive and marked them offline or failed even though they did not fail.
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post #5117 of 7269
anyone willing to try this:

http://sourceforge.net/mailarchive/f...ntools-support

I asked a question on the smartmontools support mailing list and the developer answered it. So could anyone try this out. I'm on vacation and unable to try it.

It's about TLER/CCTL support on Windows with the DELL PERC 5/i.
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post #5118 of 7269
Quote:
Originally Posted by Obscurax View Post
anyone willing to try this:

http://sourceforge.net/mailarchive/f...ntools-support

I asked a question on the smartmontools support mailing list and the developer answered it. So could anyone try this out. I'm on vacation and unable to try it.

It's about TLER/CCTL support on Windows with the DELL PERC 5/i.
Here is the output of that smartmontools version on my Perc 6/i:

Quote:
"Examples (for first drive):
smartctl -i sda Show identify information
smartctl -H sda Show SMART health status
smartctl -c sda Show SMART capabilities
smartctl -A sda Show SMART attributes
smartctl -l error sda Show error log
smartctl -l selftest sda Show self-test log
smartctl -a sda Show all of the above
smartctl -t short sda Start short self test
smartctl -t long sda Start long self test
Use "sdb", "sdc", ... for second, third, ... drive.
See man page (smartctl.8.*) for further info.

C:\\Program Files (x86)\\smartmontools\\bin>smartctl -d csmi -r scsiioctl,2 --scan
\\\\.\\PhysicalDrive0: successfully opened (without admin rights)
IOCTL_STORAGE_QUERY_PROPERTY returns:
Vendor: "WDC WD25"
Product: "00KS-00MJB0 "
Revision: "02.0"
Removable: No
BusType: 0x03
\\\\.\\PhysicalDrive1: successfully opened (without admin rights)
IOCTL_STORAGE_QUERY_PROPERTY returns:
Vendor: "DELL "
Product: "PERC 6/i "
Revision: "1.22"
Removable: No
BusType: 0x08

C:\\Program Files (x86)\\smartmontools\\bin>
post #5119 of 7269
Sup fellas.

Anyways, so I created a Raid 5 today, containing 3x 2TB disks so far, and everything seem fine, did a full init on the disks and it looks great.

But, I've read about the 'chunk size', I dont really understand the term,the only thing I know, and can watch is my stripe size, which is at 64k atm, should it be larger, is it worth changing?

Also about OCE, atm I've got 2x2TB disks as regular disks on my computer, and I want to add them to the array, should be no problem transferring the data to the array, and after that, extend the array with the disks, one after another?
post #5120 of 7269
I was wondering, what do you guys think is the best firmware for the 5/i without a BBU? IIRC, someone said something about LSi disabling writeback without a BBU after a specific firmware that I can't remember of the top of my head. Is it still true?
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