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PERC 5/i RAID Card: Tips and Benchmarks - Page 414

post #4131 of 7150
One thing i've been wondering is if anyone on here has migrated from one RAID level to another using the perc 5/i?

I'm getting another 1TB green drive and from what i've been able to find you can add another disc to the array and change the RAID level from say 0 to 5. Has anyone done this yet?
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post #4132 of 7150
Quote:
Originally Posted by RobiNet View Post
Why you don't use MegaCli for Linux:

http://www.lsi.com/storage_home/prod...#Miscellaneous

In corresponding readme.txt you will find list of all commands.
How can I install that on Ubuntu? I did apt-get install of alien and tried using:

Code:
sudo alien -d -c MegaCli-1.01.39-0.i386.rpm
(with the options "-d" for make into a .deb package and "-c" to process scripts) but I get the error message:

Code:
Package build failed [...]
dpkg-gencontrol: error: current host architecture 'amd64' does not appear in pac
kage's architecture list (i386)
    
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post #4133 of 7150
Quote:
Originally Posted by Shabranigdu View Post
I've been able to create RAID1 and RAID0 arrays with the two disks, I've been able to initialize the arrays and use them in windows. The results where quite strange:
Be it write back or write through, I had write speeds starting from 75MB/s and then dropping to 45MB/s stable.

the 'test' was a mere windows file copy. In this case, a 30GB acronis hard drive image. Speeds reported by windows server 2008 copy window details...
Open Task Manager and select Performance tab - look at Physical Memory Usage History - you will see that when system start reading/writing - windows download files to system cache and send from cache to "destination" - this is your 75MB/s peak - later when "destination" is busy with writing - system need to wait and whole process is slowed down to "destination's" max bandwith - 45MB/s stable.
post #4134 of 7150
Hey, i have a PERC 5i and 4 1TB drives in raid5 on my VMware server. Ive also replaced the heatsinks with custom ones and performed a pinmod to allow the card to run on my Asus P5Q-VM board. I have been having awful write performance on the array (maxes out at about 10MB/s). I think this is because i have no BBU attached so i bought on but when i plugged it in it still shows up in the config as being disconnected. I think this probably means its not charged, but ive left it in for a few days and it still hasnt charged. Would this mean the batterys dead or do i need to do something special to get it to charge?

The firmware on the card is the MegaRaid FW (MT 28-8) but I would quite like to return it to the origional dell firmware. When I try to flash the card I get an error (Firmware Failed to FLASH flash. Stop!!!) I've also tried putting it in another machine and trying to flash from windows but that failed too.

Any help/pointers would be much appreciated
    
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post #4135 of 7150
Quote:
Originally Posted by static-void View Post
Hey, i have a PERC 5i and 4 1TB drives in raid5 on my VMware server. Ive also replaced the heatsinks with custom ones and performed a pinmod to allow the card to run on my Asus P5Q-VM board. I have been having awful write performance on the array (maxes out at about 10MB/s).
Check if Initialization finished - on 4x 1TB drives it could take few hours

Quote:
Originally Posted by static-void View Post
I think this is because i have no BBU attached so i bought on but when i plugged it in it still shows up in the config as being disconnected.
Absence shouldn't be a problem - you can set WriteBack even without BBU.

Quote:
Originally Posted by static-void View Post
I think this probably means its not charged, but ive left it in for a few days and it still hasnt charged. Would this mean the batterys dead or do i need to do something special to get it to charge?
I think it's dead - it was new or used ?
post #4136 of 7150
post #4137 of 7150
Thanks for your reply.
Quote:
Originally Posted by RobiNet View Post
Check if Initialization finished - on 4x 1TB drives it could take few hours
Its definitally not an initialisation problem I've actually been running the array for 6 months or so. I originally had it connected via a 100mbit link so the issue wasn't obvious. however after upgrading the link its become very apparent.

Quote:
Originally Posted by RobiNet View Post
Absence shouldn't be a problem - you can set WriteBack even without BBU.
How can i do this? ive looked through the bios setting but cant find anything that looks like write back and all of my reading says that write back is automatically disabled when there is no BBU attached.

Quote:
Originally Posted by RobiNet View Post
I think it's dead - it was new or used ?
it was 'new' from an ebay seller, but im pretty sure I can RMA it, however if I can avoid it, it would be good as I had to ship it internationally.

Thanks

PS im still pretty keen on putting the original FW back if anyone has any pointers
    
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post #4138 of 7150
Quote:
Originally Posted by static-void View Post
How can i do this? ive looked through the bios setting but cant find anything that looks like write back and all of my reading says that write back is automatically disabled when there is no BBU attached.
If you have MegaRAID Storage Manager installed (I've v. 2.35-01) you will see two main tabs - Physical and Logical - go to LOGICAL.
Select your "Virtual Disk X".
Select OPERATIONS tab and SET VIRTUAL DISK PROPERTIES - you will see "USE WRITE THROUGH FOR FAILED OR MISSING BATTERY" checkbox.

For MegaCli - I think this is the right command - you need to set your params:

Quote:
MegaCli -LDSetProp {-Name LdNamestring} | -RW|RO|Blocked | WT|WB|RA|NORA|ADRA | Cached|Direct | EnDskCache|DisDskCache | CachedBadBBU|NoCachedBadBBU -Lx|-L0,1,2|-Lall -aN|-a0,1,2|-aALL
Below is info about my configuration:

Quote:
D:\\LSI\\1.01.39_Windows_Cli>megacli -ldinfo -Lall -aALL

Adapter 0 -- Virtual Drive Information:
Virtual Disk: 0 (target id: 0)
Name:RAID_5
RAID Level: Primary-5, Secondary-0, RAID Level Qualifier-3
Size:103296MB
State: Optimal
Stripe Size: 64kB
Number Of Drives:4
Span Depth:1
Default Cache Policy: WriteBack, ReadAhead, Cached, Write Cache OK if Bad BBU
Current Cache Policy: WriteBack, ReadAhead, Cached, Write Cache OK if Bad BBU
Access Policy: Read/Write
Disk Cache Policy: Enabled
Virtual Disk: 1 (target id: 1)
Name:RAID_0
RAID Level: Primary-0, Secondary-0, RAID Level Qualifier-0
Size:68864MB
State: Optimal
Stripe Size: 128kB
Number Of Drives:2
Span Depth:1
Default Cache Policy: WriteBack, ReadAhead, Cached, Write Cache OK if Bad BBU
Current Cache Policy: WriteBack, ReadAhead, Cached, Write Cache OK if Bad BBU
Access Policy: Read/Write
Disk Cache Policy: Enabled
Quote:
Originally Posted by static-void View Post
it was 'new' from an ebay seller, but im pretty sure I can RMA it, however if I can avoid it, it would be good as I had to ship it internationally.
Try this command:

Code:
MegaCli -AdpBbuCmd -BbuLearn -aALL
Here is detailed description of each command:
http://www.lsi.com/DistributionSyste..._sas_sw_ug.pdf
(page 3-16 for BbuLearn command)
post #4139 of 7150
Two interesting documents:

"Write back vs. Write through?"
http://www-903.ibm.com/kr/techinfo/x...te_through.pdf

and

"Optimizing RAID Storage Performance with the SAS-based Dell PERC 5"
http://www.dell.com/downloads/global...livarez-OE.pdf
post #4140 of 7150
Hey thanks heaps, The BBU does appear to be dead, when i query it at all it gives an error and the 'show all info command' claims its not even connected.

I also went into the webbios and found where the WB/WT settings are located (on the virtual disks not the array itself) and changed my VD's to WT. This massively boosted my performance and its now performing at a speed i would expect (which is great). Im also going to RMA the battery and if i can get that issue sorted i will enable WB caching which should make things even faster.

The megacli tool was very useful as because im running VMware i get no array tools from the OS so i put that on a floppy and it let me get some more detailed info from the card.
    
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