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PERC 5/i RAID Card: Tips and Benchmarks - Page 264

post #2631 of 7149
Quote:
Originally Posted by ShadowFox19 View Post
Where's the best place to get a BBU for my PERC 6i? One that won't be dead when I get it.
I'm in search of a BBU also, but is it necessary for best performance (write back)? If I have a UPS.
post #2632 of 7149
Have tried 2 perc's in my machine and both worked (5/E and 5/i) though i only had optical drives hooked upto the 5/i...just to see if they worked.
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post #2633 of 7149
Quote:
Originally Posted by Kamster View Post
I'm in search of a BBU also, but is it necessary for best performance (write back)? If I have a UPS.
no - if you have - or you don't have UPS you can force using WriteBack
post #2634 of 7149
Quote:
Originally Posted by RobiNet View Post
no - if you have - or you don't have UPS you can force using WriteBack
I had no idea since the perc hasn't arrived yet. Read every page but don't recall the issue addressed.
Thank you!
Edited by Kamster - 6/16/09 at 9:21am
post #2635 of 7149
Quote:
Originally Posted by Kamster View Post
I had no idea since the perc hasn't arrived yet. Read every page but don't recall the issue addressed.
Thank you!
You CAN force the PERC not to need a battery to use the onboard cache, but I would not recommend it. Any server crash or small power problem will corupt the data on the disks, potentially destroying the data on the array.

Even with a UPS this doesn't solve the problem - a server crash will still cause problems. And UPS's are not 100% either - we were in a rainstorm the other day and the lights flickered a few times (the power did not fully go out). One of my UPS's kicked in fine, the other kicked in but immediately failed, cutting the power. Thankfully the one that survived was protecting the server, the one that failed was only covering my router & cordless phone, so no damage was done. But it taught me (again) not to skimp on protecting against the 'what if?'.

Get a BBU before using the cache. They are relatively cheap, and easy to get from eBay etc. There is no point running RAID then opening yourself up to more failure points.
post #2636 of 7149
Thread Starter 
Quote:
Originally Posted by the_beast View Post
You CAN force the PERC not to need a battery to use the onboard cache, but I would not recommend it. Any server crash or small power problem will corupt the data on the disks, potentially destroying the data on the array.

Even with a UPS this doesn't solve the problem - a server crash will still cause problems. And UPS's are not 100% either - we were in a rainstorm the other day and the lights flickered a few times (the power did not fully go out). One of my UPS's kicked in fine, the other kicked in but immediately failed, cutting the power. Thankfully the one that survived was protecting the server, the one that failed was only covering my router & cordless phone, so no damage was done. But it taught me (again) not to skimp on protecting against the 'what if?'.

Get a BBU before using the cache. They are relatively cheap, and easy to get from eBay etc. There is no point running RAID then opening yourself up to more failure points.

Also, UPS only protect from power source issues. It doesn't protect from system-caused hard shutdowns (i.e. overheating, OS crash-related reboot)
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post #2637 of 7149
I was thinking that maybe I could have identical raid 5s on each card, and then have a raid 50 across both. I thought I read about that being possible... might have been a different card tho.
post #2638 of 7149
Hey guy got a question.

I recently updated to LSI firmware on my 6/i.
Everything works, BUT with 4 wd 640 as BOOT/OS drive, how do I set the array for windows?

With Dell firmware, all I need to do is press Ctrl R.

But with the LSI FW, pressing Crtl R freezes or restarts the PC.
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post #2639 of 7149
Quote:
Originally Posted by crazcookye View Post
Hey guy got a question.

I recently updated to LSI firmware on my 6/i.
Everything works, BUT with 4 wd 640 as BOOT/OS drive, how do I set the array for windows?

With Dell firmware, all I need to do is press Ctrl R.

But with the LSI FW, pressing Crtl R freezes or restarts the PC.
Sounds like you got a bad flash, you should try flashing it back to the original firmware.
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post #2640 of 7149
Thread Starter 
Quote:
Originally Posted by crazcookye View Post
Hey guy got a question.

I recently updated to LSI firmware on my 6/i.
Everything works, BUT with 4 wd 640 as BOOT/OS drive, how do I set the array for windows?

With Dell firmware, all I need to do is press Ctrl R.

But with the LSI FW, pressing Crtl R freezes or restarts the PC.
Which BIOS did you flash to the PERC 6/i?
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