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PERC 5/i RAID Card: Tips and Benchmarks - Page 176

post #1751 of 7276
would it be possible to run a raid5 array of 3 1TB hdds on one sas connector. Then on the other sas connector run a raid0 array of 2 1TB hdds?
post #1752 of 7276
Quote:
Originally Posted by FoxRacR17 View Post
would it be possible to run a raid5 array of 3 1TB hdds on one sas connector. Then on the other sas connector run a raid0 array of 2 1TB hdds?
You could put any number of disks (up to 8 without a fanout multiplier) on any of the 2 connectors and run whatever raid levels you want on any combinations of the disks, up to a total of 16 virtual disks.... this is a very powerful and customizable card.
    
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post #1753 of 7276
Quote:
Originally Posted by FoxRacR17 View Post
would it be possible to run a raid5 array of 3 1TB hdds on one sas connector. Then on the other sas connector run a raid0 array of 2 1TB hdds?
To confirm... I'm running two 80Gb drives in raid1 & 6 500's in Raid5, so absolutely an option.
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post #1754 of 7276
Quote:
Originally Posted by RobiNet
I know that ECC stick is important - but mu question is - can I use non-TBBU memory stick - 512MB stick without battery support? Can I use 512MB stick from 5/i in 5/e ?

This is from PERC 5/i and 5/e UserGuide:

"PERC 5 cards support DELL-qualified 256-MB DDRII 400MHz ECC-registered DIMMs with x16 DRAM
components. Installing unsupported memory causes the system to hang at POST." - and exactly the same sentence is used twice - for 5/e TBBU and 5/i BBU ...
so nobody had ever checked this simple thing ??
post #1755 of 7276
Quote:
Originally Posted by RobiNet View Post
so nobody had ever checked this simple thing ??
I have no idea because I dont have a 5/e and im not sure who else on here has one... Sorry mate

i would honestly just use the 256MB TBBU rather than getting a 512MB with no battery because the performance you'll gain with the write back mode will be leaps and bounds better than write through mode without battery backup (and i wouldnt recommend using write back without a BBU)
    
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post #1756 of 7276
Quote:
Originally Posted by DJZeratul
I have no idea because I dont have a 5/e and im not sure who else on here has one... Sorry mate

i would honestly just use the 256MB TBBU rather than getting a 512MB with no battery because the performance you'll gain with the write back mode will be leaps and bounds better than write through mode without battery backup (and i wouldnt recommend using write back without a BBU)
yes I know that sorry, I wasn't clear I want to install 512 MB stick + battery from PERC 5/i ... so I'll have external ports (I don't need them - but maybe I'll win PERC 5/e or 6/e very cheap ), bigger cache and all advantages of battery ...

edit: Or there is no way to connect battery from 5/i to 5/e ??
Edited by RobiNet - 3/23/09 at 4:07am
post #1757 of 7276
Quote:
Originally Posted by RobiNet View Post
yes I know that sorry, I wasn't clear I want to install 512 MB stick + battery from PERC 5/i ... so I'll have external ports (I don't need them - but maybe I'll win PERC 5/e or 6/e very cheap ), bigger cache and all advantages of battery ...

edit: Or there is no way to connect battery from 5/i to 5/e ??
I am pretty sure the 5/e does not have an onboard BBU port that you can plug the 5/i battery into...



Taking a look at the board, there isnt. The battery on the TBBU is directly connected to the RAM, hence why its transportable... it only keeps power to the RAM and doesnt touch the board itself.
    
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post #1758 of 7276
Quote:
Originally Posted by DJZeratul
I am pretty sure the 5/e does not have an onboard BBU port that you can plug the 5/i battery into...

Taking a look at the board, there isnt. The battery on the TBBU is directly connected to the RAM, hence why its transportable... it only keeps power to the RAM and doesnt touch the board itself.
so ... PERC 6 with 256MB will be as fast as PERC 5 with 512MB ? or much slower ? or RAID 6 is enough reason to buy PERC 6 ? and I don't mean server with 8x1TB hdd - only 6-8 36GB 10k SAS for workstation ...
post #1759 of 7276
Quote:
Originally Posted by RobiNet View Post
so ... PERC 6 with 256MB will be as fast as PERC 5 with 512MB ? or much slower ? or RAID 6 is enough reason to buy PERC 6 ? and I don't mean server with 8x1TB hdd - only 6-8 36GB 10k SAS for workstation ...
Honestly at this point I am not sure whether to recommend the PERC 6 over the PERC 5 because I haven't really seen very impressive numbers from my 6/i... I am not sure if its the card or if its my system or what. Honestly RAID 6 is nice if you want extra protection but its slower than 5 and if you want good performance I would just run RAID 5 with a hot spare. Its not the same as RAID 6 but it is similar in function.
    
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post #1760 of 7276
Quote:
Originally Posted by DJZeratul
Honestly at this point I am not sure whether to recommend the PERC 6 over the PERC 5 because I haven't really seen very impressive numbers from my 6/i... I am not sure if its the card or if its my system or what. Honestly RAID 6 is nice if you want extra protection but its slower than 5 and if you want good performance I would just run RAID 5 with a hot spare. Its not the same as RAID 6 but it is similar in function.
OK thank you so I'll stay with PERC 5/i and I'll buy 8x 2.5" 36GB 10k SAS Fujitsu + 2x 5.25" drive bays for 4x 2.5"



and I should have really fast RAID 5 workstation - 6 +2 as hot-spare or RAID 0+1 - 4+4 (stripe+mirror) - will be faster and safer
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