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PERC 5/i RAID Card: Tips and Benchmarks - Page 406

post #4051 of 7172
Also, Does anyone know if HP SAS Expanders work with the PERC 6/i controler? Thanks
post #4052 of 7172
Quote:
Originally Posted by Therealmaster967 View Post
Looking for some help diagnosing whats going on here.

System:
Tyan K8WE, with dual Opteron 295's
16GB Crucial PC3200
Perc 6/i, BBU & good cooling
8 Seagate Savvio 15k1 36GB 2.5" drives in Raid 6 with a 64KB stripe, Adaptive Read ahead, Writeback, and Cached IO

Array has been sitting in use for weeks now, and MSM shows no current operations being performed on the array. She does have Vista x64 installed on the array, but well, without anything else running to access the hard drive while running the tests, I get this sort of display:

Block size of 64KB:
See first attached image.
Block size of 8MB:
See second attached image.

Which is much less than the sum of the six of these doing the work in the array.
Does anyone have any suggestions as to whats going on or what I can try? Looking for a bit more speed from a eight disk array with drives which should easily push more like 80-108MB/s each.
Your first bench is basically testing only a single drive as you are running 64K blocks on a 64K striped array.

TBH your second bench doesn't look too bad - do not expect to get linear scaling with higher numbers of drives, especially running in RAID6.

You will almost certainly get better performance if you switch to RAID10 anyway. RAID6 is a poor choice for OS use - even worse than RAID5.
post #4053 of 7172
Hi guys,

i need a suggestion. I just got a perc 5/i card and 4 wd re-3 500gb drives. What would be the best way to configure them performance wise raid-5 or raid-10. what stripe size should i use? The disks will be used for the OS and office automation usage + a couple of vm's with vmware

Thanks

Stefano
post #4054 of 7172
Quote:
Originally Posted by smingoli View Post
Hi guys,

i need a suggestion. I just got a perc 5/i card and 4 wd re-3 500gb drives. What would be the best way to configure them performance wise raid-5 or raid-10. what stripe size should i use? The disks will be used for the OS and office automation usage + a couple of vm's with vmware

Thanks

Stefano
Either a single RAID10 array or 2 RAID1 arrays will likely be best. A RAID5 array will likely perform poorly for this application.
post #4055 of 7172
Quote:
Originally Posted by the_beast View Post
Your first bench is basically testing only a single drive as you are running 64K blocks on a 64K striped array.

TBH your second bench doesn't look too bad - do not expect to get linear scaling with higher numbers of drives, especially running in RAID6.

You will almost certainly get better performance if you switch to RAID10 anyway. RAID6 is a poor choice for OS use - even worse than RAID5.
Roger that. Thanks! Unfortunetly, I need the peace of mind that raid 6 gives, raid 10 only allows for one drive failure, and after that, you're just betting.
post #4056 of 7172
Quote:
Originally Posted by Therealmaster967 View Post
Roger that. Thanks! Unfortunetly, I need the peace of mind that raid 6 gives, raid 10 only allows for one drive failure, and after that, you're just betting.
In that case split up your arrays for better performance.
post #4057 of 7172
Please explain what you mean by splitting up the arrays. Thanks!
post #4058 of 7172
Quote:
Originally Posted by Therealmaster967 View Post
Please explain what you mean by splitting up the arrays. Thanks!
I think he's saying that instead of running RAID10 with 4 drives, you could try running RAID 0 and 1 separately with 2 drives in each array
Blue Shadow
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CPUMotherboardGraphicsRAM
Intel i7 920 D0 3939B078 @ 4.0Ghz eVGA x58 SLi A1 E758 2x Galaxy GTX 460 768MB SLi @ 825/1650/4000 12GB (6x2GB) OCZ Gold 1600MHz DDR3 
Hard DriveOptical DriveOSMonitor
Perc 5/i RAID5 - 4x WD 640GB Blue 2x Samsung SH-S203B Windows 7 Ultimate x64 3x NEC 20WMGX2 AS-IPS 20.1" LCD @ 5040x1050 
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Blue Shadow
(13 items)
 
  
CPUMotherboardGraphicsRAM
Intel i7 920 D0 3939B078 @ 4.0Ghz eVGA x58 SLi A1 E758 2x Galaxy GTX 460 768MB SLi @ 825/1650/4000 12GB (6x2GB) OCZ Gold 1600MHz DDR3 
Hard DriveOptical DriveOSMonitor
Perc 5/i RAID5 - 4x WD 640GB Blue 2x Samsung SH-S203B Windows 7 Ultimate x64 3x NEC 20WMGX2 AS-IPS 20.1" LCD @ 5040x1050 
KeyboardPowerCaseMouse
Logitech G15 (Blue v1) Antec TruePower Quattro 850W Lian Li Lancool PC-K63 Logitech G9x 
Mouse Pad
Cyber Snipa Tracer 
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post #4059 of 7172
Quote:
Originally Posted by SFaznSpEEdSTeR View Post
I think he's saying that instead of running RAID10 with 4 drives, you could try running RAID 0 and 1 separately with 2 drives in each array
Thanks.
How does this get better performance, or security than a 8 disk raid 6 array? Thats the part I have trouble following.
post #4060 of 7172
Quote:
Originally Posted by the_beast View Post
Either a single RAID10 array or 2 RAID1 arrays will likely be best. A RAID5 array will likely perform poorly for this application.
So if I opt for raid 10 which stripesize will I use?
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