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When using the SQLIO benchmark tool on a 4-core Dell server with 6 15k 450GB (fast) drives, RAID 0, we found the max throughput was 2MB per second. But when configured as RAID 5, we get 30 MB per second.
It seems that the RAID controller, Dell Perc 5i...
Started by markn on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at stackoverflow):
RAID 5 also spreads but isn't terrible....
RAID 0 stripes across all the drives so parts of the data you are writing will end up spread across the 6 disks.
RAID 0 write speeds should be significantly faster than RAID 5.
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Yes, this is on of those "do my job for me" questions, have some pity:)
I'm at the limit for what I can do with the number of hard drives in a server without spending a substantial amount of money. I have four drives left to configure, and I can either...
Started by Boden on
, 7 posts
by 7 people.
Answer Snippets (Read the full thread at serverfault):
(ie disk fails, raid rebuilds, disk, can survive (in the....
With either scenario, except with raid 10 if you happen to lose the wrong 2 drives then you'll have a real occur over enough time for the raid to rebuild between failures.
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I have Dell Poweredge server 2600 with Raid 5 in 3 hard drive Scsi 36gb each, it was fail to boot sinc the third drive is offline.
I attached Sata card adapter to Sata hard drive and install OS SERVER 2003 to it, downloaded drivers for Raid and everything...
Answer Snippets (Read the full thread at serverfault):
And the boot from the Win-PE-CD with your RAID....
Just simple disks.
When I read (quick overview, 5 sec.) the webpage on "RAID Reconstructor" right, you'd put these three disks into a computer with no RAID-controller attached.
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Ask your Facebook Friends
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Mdadm does not seem to support growing an array from level 1 to level 10.
I have two disks in RAID 1. I want to add two new disks and convert the array to a four disk RAID 10 array.
My current strategy:
Make good backup. Create a degraded 4 disk RAID ...
Started by Hans Malherbe on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at serverfault):
0) Backup, Backup, Backup, Backup oh and BACKUP
1) Make the new array:
mdadm -v --create /dev/md1 --level=raid10 --raid-devices=2 /dev/sda1 /dev/sdb2
2) Mount the raid....
With linux softraid you can make a RAID 10 array with only two disks.
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What is the formula for working out the final raid size of a raid 5 array knowing the number of disk and the size of each disk?
Started by GateKiller on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at stackoverflow):
Bear in mind that although RAID 5 gives good fault tolerance better fault tolerance....
Is treated as a 500GB) Ripped from Wikipedia
Therefore, the usable capacity of a RAID 5 array is (N-1 of the smallest drive in the array.
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With RAID 5 capability is lost if there are disks of different sizes? Same as RAID 0 and RAID 1. If something happens the speeds are different? 10K and 15K.
Started by Fidel on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at serverfault):
The problem is that it has a damaged disc on RAID 5At best any striped RAID configuration will support reading one stripe per physical disk per expect it to work with some but not all I/O....
But never ever put such a setup in production.
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I have a failed RAID 5 on a silicon raid chip on and ASUS motherboard. (nothing special) The raid consists of 3 drives. One of the drives died(or at least the RAID chip claims it is invalid) and the machine now freezes when it tries to boot to the raid...
Started by Preston Taylor on
, 7 posts
by 6 people.
Answer Snippets (Read the full thread at superuser):
RAID is not backup, but the "R should be able to boot the ....
Http://en.wikipedia.org/wiki/RAID%5F5#RAID%5F5
In theory, you should be able to remove the broken drive, and replace it and get the RAID array to recover the array.
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I'm using a hardware HP RAID controller. My server came with one 250GB drive. I purchased three additional 250GB drives with the intent of having one as a cold-spare.
I put the two additional drives in the server and powered it up. I went into the BIOS...
Started by DWilliams on
, 3 posts
by 3 people.
Answer Snippets (Read the full thread at serverfault):
As others have said and you have witnessed by "All I can choose is 0, 1, and 10." You... .
Sometimes they will be a 'light controller doesn't support RAID 5.
It's possible that your RAID controller does not support RAID 5.
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Our RAID controller failed; it doesn't show up with a boot menu anymore, and the BIOS finds no disks. When we get a new controller, can we recreate the RAID set without losing data? IIUC, the controller has the configuration in RAM, not on disk (and yes...
Started by Martin v. Löwis on
, 4 posts
by 4 people.
Answer Snippets (Read the full thread at serverfault):
The controller should just read that information, but that is the case with the Dell... .
Generally RAID information is stored on the disc, but get the exact same raid controller.
A copy of the data the world won't end if it all gets lost.. .
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Hi all,
I have a Dell 2950 with 6 disks, I'd like 2 RAID 5 arrays 3 disks in each array. The RAID manager only allows me to create 1 array, after the array is created I can't create another. Why would this be?
PS I'm going to install Exchange 2010 on ...
Started by Steven on
, 6 posts
by 6 people.
Answer Snippets (Read the full thread at serverfault):
For MS Exchange, it is recommendable to stay away from parity RAID....
If youUsually most RAID controllers allow multiple arrays, that's weird.
X300GB (+1 hot swap) Raid 5
I'd get on the horn w/your AM at dell or tech support.
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