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PERC 5/i RAID Card: Tips and Benchmarks - Page 585

post #5841 of 7150
Thanks!

Yeah I do have Write Back enabled, I also have the option to write back with BBU, but I dont seem to be able to enable it.

And yeah, I do have a BBU connected, and the charge seems fine

Do you know anything about that?

Regards
Edited by fozzie - 2/8/12 at 4:05am
post #5842 of 7150
are you getting copy speeds of about 40MBps?

i had a problem with my previous PERC5i battery where it kept changing between write through and write back depending on the charge level (it was showing this in the megaRAID log). This caused my writes to drop to bout 40MBps at random times throughout the day\week.
2yma7v8.png
as you can see it was showing the absolute state of charge as 46%. Once i replaced the battery I've had no problems with slow transfer speeds.
post #5843 of 7150
The problem I had was mostly getting Disk Overload on utorrent constantly on my RAID, but enabling disk cache seem to have fixed the problem, I havent had any disk overload since then, and hopefully I wont have them anymore, so thanks for that!

My battery says relative charge 97%, and the Absoluty charge is about 55%.

Do you still think I need to replace the battery? It's been running for about a year i recon.

Regards
post #5844 of 7150
Just have a look at log in MegaRAID console, it will tell you if it's switching between write back and write through.

it will say something like,

Battery below threshold - Default write mode changed to write through.

and then after a while it will say.

Battery above threshold - Default write mode changed to write back..

If thats not showing in your log then your ok smile.gif
post #5845 of 7150
Okay, thanks, I've looked through the log for the past week and it doesnt seem to swap between the 2 modes.

But thanks again for the help, this seem to have fixed my problem. smile.gif
post #5846 of 7150
Quote:
Originally Posted by tr8rjohnk View Post

I've been running three 1.5tb drives in a RAID 5 array. The primary virtual disk is 500gb mbr and the remaining space is formatted in gpt. Now, I remember adding drives to these controllers and it was as simple as right-clicking the vd and selecting the reconstruction wizard under advanced (or something similar).

I just added to physical disks and in the megaraid storage manager (version 2.35-1), they are marked as unconfigured and good but when I right-click a vd, I have no option for the reconstruction wizard. confused.gif

Not sure if you still needed the answer to this, but I think I found it. Instead of right clicking the Virtual Drive, right click the Drive Group and choose "Modify Drive Group". It'll warn you to back up data, check the box and click yes. Then you should be able to add/remove drives there or change the RAID level.
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HvyMtlChaos
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post #5847 of 7150
Quick question - can I use "Infiniband SFF-8470 to Mini SAS 4x SFF-8088" cable both ways ?
1) Infiniband=host -> Mini SAS=drives
2) Mini SAS=Host -> Infiniband=drives ?
thanks
post #5848 of 7150
Hey guys, we have one of these cards in our backup server at my workplace. We needed some more space, so I ordered an SFF 8484 to 4 x Sata breakout cable from an online supplier. I whacked everything in and was greeted with a lack of drives being detected by the SAS 6i/r card. Is there something that needs to be enabled in the firmware to allow the use of breakout cables?

All drives are detected with the stock Dell cable on both channels.
No drives are detected with the breakout cable, whether they are connected one at a time or all together on either channel.

Here's a little picture:
IMAG0029.jpg

Any help appreciated.
post #5849 of 7150
Hey gonadman2,

If it works with the old cable but not the newer, my guess would be bad cable....
There are various posts on the subject in the thread.

Guess reading the whole thread was useful after all!

There is 2 kind of cable, only difference is the internal wiring. (ie. you cant find out just by looking at them.)
You have to get the right one, or it doesn't work.
I don't want to put more details in here because I might mix things up....

I got the crossmark one listed in the thread and they work fine.

DW
post #5850 of 7150
Quote:
Originally Posted by deskwizard View Post

Hey gonadman2,
If it works with the old cable but not the newer, my guess would be bad cable....


There is 2 kind of cable, only difference is the internal wiring. (ie. you cant find out just by looking at them.)
You have to get the right one, or it doesn't work.
I don't want to put more details in here because I might mix things up....
I got the crossmark one listed in the thread and they work fine.
DW

Yup, I ran into a similar issue and it turned out to be the cables. The cables are direction specific, you have to make sure it is designed to treat the card as the "host" and the drives as "clients" or targets.
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