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PERC 5/i RAID Card: Tips and Benchmarks - Page 646

post #6451 of 7150
Say I still want to stop it, how would / could I?
Edited by caraboose - 3/23/13 at 7:23pm
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post #6452 of 7150
Quote:
Originally Posted by caraboose View Post

Say I still want to stop it, how would / could I?

EDIT: Patrol read is not what is causing your array to say it needs attention.

Mega CLI or Mega Raid Storage Manager under VD properties. Google it and you can easily find the commands. I'm not going to provide directions since I don't wanna be responsible for other people loosing their arrays/data due to issues arising from disabling patrol read. If you want to go down that extremely dangerous path, be aware you are SOL if a PD fails and takes the array with it. Patrol read only occurs during low i/o when set to automatic.

Here is a quote from LSI:

Patrol read involves the review of your system for possible physical disk
errors that could lead to drive failure and then action to correct errors.
The goal is to protect data integrity by detecting physical drive failure
before the failure can damage data. The corrective actions depend on
the array configuration and the type of errors.

Patrol read starts only when the controller is idle for a defined period of
time and no other background tasks are active, though it can continue to
run during heavy I/O processes.
post #6453 of 7150
Well the reason it 'needs attention' is because I have a drive missing, gone to RMA from one of the arrays. Lol.

I've looked around in the megaraid software, and couldn't find a place to schedule when a patrol read happens, is there any way to do that? Instead of when the controller is under low use.
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post #6454 of 7150
Can anyone explain why the Perc5/i cant support 3 drive in raid 1 array, seems foolish as im looking to increase my data redundancy and read speeds?

Thanks
 
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post #6455 of 7150
I am having an issue with my PERC 5/i. The white port isn't picking up drives. I have only ever had 4 drives on it, all on the black port. I tried to plug some drives into the white port and nothing happens, with either set of cables. Is there any settings that would prevent it for working?
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post #6456 of 7150
Quote:
Originally Posted by Tempest_Inc View Post

Can anyone explain why the Perc5/i cant support 3 drive in raid 1 array, seems foolish as im looking to increase my data redundancy and read speeds?

Thanks

RAID 1 requires an even number of drives because its mirroring the data. I would highly suggest you read up on raid before using your Perc 5 to avoid issues.

If you have 3 Hard Drives, your options are RAID 0 and RAID 5.

RAID 0 -
Striping Across all HDD.
Fastest IOPS.
No redundancy - 1 HDD Failure results in total data loss.

RAID 5 -
Striping with Distributed Parity
Fast Reads / Slower Writes
Redundancy - 1 HDD Failure.
post #6457 of 7150
Quote:
Originally Posted by kyle5281 View Post

RAID 1 requires an even number of drives because its mirroring the data. I would highly suggest you read up on raid before using your Perc 5 to avoid issues.

If you have 3 Hard Drives, your options are RAID 0 and RAID 5.

RAID 0 -
Striping Across all HDD.
Fastest IOPS.
No redundancy - 1 HDD Failure results in total data loss.

RAID 5 -
Striping with Distributed Parity
Fast Reads / Slower Writes
Redundancy - 1 HDD Failure.

I've run raid for years i'm just not familiar with raid 1 beyond 1 drive for OS, i just thought Raid 1 would support spanning multiple hard drives as all it's doing is duplicating the data. I'll look into it more as i'm testing a few different configurations to get the best results for what i'm trying to do as well i'm getting weird results while testing a raid 10 configuration if anyone can explain why each run gets slower.
This is a combination of 3x500 GB and 1x400 Raid 10 short stroked to 200GB for increase in performance.






 
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post #6458 of 7150
Quote:
Originally Posted by Tempest_Inc View Post
I've run raid for years i'm just not familiar with raid 1 beyond 1 drive for OS, i just thought Raid 1 would support spanning multiple hard drives as all it's doing is duplicating the data.

Some (very few - I used to know off the top of my head, but can't recall atm as it's 2am & I've had 4 hours sleep in the last 3 days - think the newer LSI) controllers can do multiple RAID1 drives mirrored.  You can also do it in software with *nix under mdadm or zfs IIRC.  Most hardware cards insist on 2 drives only though.

 

Many LSI cards will also RAID1E with 3 drives as well, but you still only get 2 copies of your data, with capacity of 1 1/2 drives total - so not what you want.

post #6459 of 7150
Quote:
Originally Posted by Tempest_Inc View Post

I've run raid for years i'm just not familiar with raid 1 beyond 1 drive for OS, i just thought Raid 1 would support spanning multiple hard drives as all it's doing is duplicating the data. I'll look into it more as i'm testing a few different configurations to get the best results for what i'm trying to do as well i'm getting weird results while testing a raid 10 configuration if anyone can explain why each run gets slower.
This is a combination of 3x500 GB and 1x400 Raid 10 short stroked to 200GB for increase in performance.

You need to stick with the same size drives, preferably with the same spindle count and vendor even. Mixing drives is going to give you mixed performance results because the drives will have different performance characteristics throughout the platters.

As for RAID1 over 3 drives, it just doesn't make sense to me to even attempt this. You wouldn't want one drive to have duplicated data as well as regular storage, and with 4 drives RAID10 would make the most sense to me with RAID5 a close second if you are using RAID edition or enterprise class drives.

For home storage, get an SSD for the OS and forget about RAID altogether IMO.
post #6460 of 7150
My old file server died the other day. mad.gif
Not mention it needs an upgrade.

Can anyone recommend a good amd mother board socket am3+ or fm2 to use with my perc 5/I card?

thanks for you advise,
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