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PERC 5/i RAID Card: Tips and Benchmarks - Page 493

post #4921 of 7150
Quote:
Originally Posted by nizce;12122481 
Hi,

I just ordered a Perc 6/i card. Until now i have used software raid 5 in linux.
Today i got 5x1,5TB Samsung F2 in that raid 5 setup. But i want to migrate to raid 6 instead, so i bought the Perc 6 card.

Now to my questions:
I'm looking for 2TB 5400rpm SATA disks for the moment. I don't really care about speed, so i'm going to settle for the best/cheapest HDDs.

The once that i found so far is:
Samsung F4 2TB
WD Caviar Green 2TB
Seagate Barracuda LP 2TB

Has anybody got any experience with those drives?

I've also read something about the "green" drives could cause trouble if they spin down? Anyone got any input on that?


Also, what is the recommended stipe-size for say 8x2tb RAID 6 array?
I'm going to start out with 4x2tb drives in raid 6, does that affect the recommended stripe-size(guess it's not possible to change the stripe size once there is data present in the partition)?


Oh and I more thing, can an existing raid array be moved from a PERC 5/i controller, and imported to a PERC 6/i?


Grateful for all the input i can get! smile.gif

I've been using those Seagates for a long while now, and just put 7 of them on a PERC 6/i. So far, so good! Before being on this controller, I've used them in HTPCs, gaming desktops for large storage, and single builds for friends etc. No failures so far for me with them at all.
I don't let my drives spin down at all, so I'm not sure about issues with that.
Stripe size is dependant on what you're going to store on the array, as well as how you intend to use it. See the post RIGHT above your own.
I don't know about migrating the array from one controller to another... I would personally keep the old one running, setup the new one, move all the data over, verify it, then decommission the old array.
post #4922 of 7150
Quote:
Originally Posted by RSalamon;12124676 
I've been using those Seagates for a long while now, and just put 7 of them on a PERC 6/i. So far, so good! Before being on this controller, I've used them in HTPCs, gaming desktops for large storage, and single builds for friends etc. No failures so far for me with them at all.
I don't let my drives spin down at all, so I'm not sure about issues with that.
Stripe size is dependant on what you're going to store on the array, as well as how you intend to use it. See the post RIGHT above your own.
I don't know about migrating the array from one controller to another... I would personally keep the old one running, setup the new one, move all the data over, verify it, then decommission the old array.

To add to this, the reason "green" drives cause issues is because they contain power saving features built into the drive usually which triggers the drive as as a failure and causes the array to go into a degraded state.

I have 4x2TB Samsung Eco disk. They are green drives mainly because they run at 5400RPM, but the speed is exceptionally good due to the disk density, and don't have this issue. I have read most of these issues are with WD disk, but mileage will vary I assume smile.gif

In regards to stripe size, look above like he said. For large files you can do up to 1MB on the Perc 6/i I think, thats what I have since I store a lot of large files.

Lastly, you definitely can not import the config from the 5/i to the 6/i, especially if you are going from RAID 5 to RAID 6. Good luck!
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post #4923 of 7150
I have had a perc 5/i for a while now, but I have never been very happy with the performance . I would appreciate some help. confused.gifconfused.gifcool.gif

I am running a raid 0 setup, with a stripe size of 512kb, with two Corsair X64 SSDs. On a Windows 7 x64 system.


I am using the latest LSI firmware (7,01-0075) Bios I have not touched, have MT33
And the driver is The one automaticaly installed by Windows 7 ()

No read ahead.
Wb is forced on without using a battery.
Io policy: direct IO.
Disk cache policy: disabled.

I think the benchmarking results seem very volatile and inconsistent. The burstrate also seems low to me.

Any ideas on what could be causing these symptoms?

benchssdraid0.png
post #4924 of 7150
Quote:
Originally Posted by moggzor;12133589 
And the driver is The one automaticaly installed by Windows 7 ()

No read ahead.
Wb is forced on without using a battery.
Io policy: direct IO.
Disk cache policy: disabled.

Uh...... aren't all those settings counter productive towards a high performing array? (other than WB) Wouldn't you normally want read-ahead, cached I/O and disk cache=enabled ?
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TAIPEI
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post #4925 of 7150
Also running 2x8 F4EG drives on two PERC 6/i without any problems. Furthermore using linux and smartmontools its possible to read out the smart values (and possibly setting CCTL, although I haven't tried this yet).

In order to get an insight how well your controller works with the different kind of strip sizes, take a look here. Although you should test this for you own, based on your workload.
post #4926 of 7150
Quote:
Originally Posted by moggzor;12133589 
I have had a perc 5/i for a while now, but I have never been very happy with the performance . I would appreciate some help. confused.gifconfused.gifcool.gif

I am running a raid 0 setup, with a stripe size of 512kb, with two Corsair X64 SSDs. On a Windows 7 x64 system.


I am using the latest LSI firmware (7,01-0075) Bios I have not touched, have MT33
And the driver is The one automaticaly installed by Windows 7 ()

No read ahead.
Wb is forced on without using a battery.
Io policy: direct IO.
Disk cache policy: disabled.

I think the benchmarking results seem very volatile and inconsistent. The burstrate also seems low to me.

Any ideas on what could be causing these symptoms?

benchssdraid0.png

Wow... yeah, mine must totally suck, then. My numbers aren't near yours frown.gif. I think I hit like 130MB.sec read... *sigh*. I don't need high performance at all, but dang this sucks.
post #4927 of 7150
Quote:
Originally Posted by moggzor;12133589 
I am running a raid 0 setup, with a stripe size of 512kb, with two Corsair X64 SSDs. On a Windows 7 x64 system.
...
No read ahead.
Wb is forced on without using a battery.
Io policy: direct IO.
Disk cache policy: disabled.
...
Any ideas on what could be causing these symptoms?
  • For SSDs your stripe size is way too big.
  • Some PERC firmware versions will allow you to select 'force write through', but if you don't have a battery it won't actually do anything.
  • The SSD controller needs cache much more than a HDD controller does - if you switch it off you will likely get very poor performance or unpredictable results.
post #4928 of 7150
Quote:
Originally Posted by dude051;12127768 
Lastly, you definitely can not import the config from the 5/i to the 6/i, especially if you are going from RAID 5 to RAID 6. Good luck!

Do you know this for certain? I was pretty sure the documentation says you can import arrays on the 6/i that were created on the 5/i. If you then add an extra disk you can convert a RAID5 array to a RAID6.
post #4929 of 7150
Anyone know what this error is telling me exactly?
Quote:
ID = 170
SEQUENCE NUMBER = 4318
TIME = 25-01-2011 14:14:43
LOCALIZED MESSAGE = Controller ID: 0 Battery/charger problems detected; SOH Bad

I'm getting a new battery tomorrow from the seller who sold me the PERC and BBU, but what's "SOH Bad"?
post #4930 of 7150
Quote:
Originally Posted by RSalamon;12141896 
Anyone know what this error is telling me exactly?


I'm getting a new battery tomorrow from the seller who sold me the PERC and BBU, but what's "SOH Bad"?
In the world of batteries, you have state-of-charge (SoC) and state-of-health (SoH)

State of Charge is simply how charged the battery is as a percentage of its remaining capacity. State of Health takes it a step further and takes a look at the batteries current maximum capacity and its rated, at manufacture capacity. If this falls below a certain percentage of its rated at manufacture capacity, the SOH will return as bad.

SOH Bad simply means that the battery cannot keep a good charge anymore because its remaining capacity is so low that it fails a health check.
Edited by DJZeratul - 1/25/11 at 8:48pm
    
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