Re: Dell Perc 5/i Performance issues

Im using the Samsung F3 disks, which can do 140MB/s sequentially. I have 
tried different raids raid0 will do just as bad as raid5. I even tried 
one disk which performed as expected 100MB/s+ reads and writes so I'm 
not sure anymore what could be the problem. Maybe the controller hates 
samsung disks?

-zsozso

On 2010.06.19. 0:21, krad wrote:
> On 18 June 2010 10:08, oizs<oizs_at_freemail.hu>  wrote:
>
>    
>> I've seen people with the same configuration doing 160MB/s writes and
>> 250MB/s+ reads with raid5 so I still think something isn't right. And using
>> raid10 with 4 disks is a rather large waste of capacity.
>>
>> -zsozso
>>
>>
>> On 2010.06.18. 1:55, Chuck Swiger wrote:
>>
>>      
>>> On Jun 17, 2010, at 4:50 PM, oizs wrote:
>>>
>>>
>>>        
>>>> I've bought a Dell Perc 5/i because I couldn't make the onboard marvell
>>>> 88sx7042 work with 8.0/8.1 or current, but as lucky as I am, the best I can
>>>> do with 4x1.5tb samsung in raid5 is 60MB/s writes and 90MB/s reads, with
>>>> bbu/write-back/adaptive-read-ahead.
>>>>
>>>> I was expecting at least twice of that, and I'm not sure what can I do to
>>>> get that speed. (I've read man 7 tuning with no success)
>>>>
>>>>
>>>>          
>>> Switch to using RAID-10 rather than RAID-5.  It's normal for RAID-5 to
>>> have worse write performance than that of a single drive.
>>>
>>> Regards,
>>>
>>>
>>>        
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>>      
> what are your drives though? Are they SATA green/eco type drives or proper
> SAS enterprise ones
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