#smartarray

Answer: Can't Remove Logical Drive/Array from HP P400 #computers #dev #solution

Can’t Remove Logical Drive/Array from HP P400

This is my first post here. Thank you in advance for any assistance with this matter.

I’m trying to remove a logical drive (logical drive 2) and an array (array “B”) from my Smart Array P400. The host is a DL580 G5 running 64-bit Red Hat Enterprise Linux Server release 5.7 (Tikanga). I am unable to remove the array using either hpacucli or cpqacuxe.…

Solution: Why are "sectors per track" still relevant on a modern OS with modern drives? #development #it #fix

Why are "sectors per track" still relevant on a modern OS with modern drives?

I am building out a new machine and the raid controller is asking me for sectors per track. I haven’t had to deal with disk math in a long time (1998?), and I can’t find anything that pertains to modern hardware. These are 2TB SAS drives running a 2.8 kernel on a p420i controller.

What is the difference between the…

Resolved: Can different drive speeds and sizes be used in a hardware RAID configuration w/o affecting performance? #fix #answer #solution

Can different drive speeds and sizes be used in a hardware RAID configuration w/o affecting performance?

Specifically, I have a RAID 1 array configuration with two 500gb 7200rpm SATA drives mirrored as logical drive 1 (a) and two of the same mirrored as logical drive 2 (b). I’d like to add two 1tb 5400rpm drives in the same mirrored fashion as logical drive 3 (c). These drives will only serve as…

Answer: HP DL380p Gen8 (p420i controller) I/O oddity on XFS partitions #development #computers #it

HP DL380p Gen8 (p420i controller) I/O oddity on XFS partitions

On DL380p gen8 servers using XFS on top of LVM on top of raid 1+0 with 6 disks, an identical workload results in a ten-fold increase in disk writes on RHEL 6 compared to RHEL 5, making applications unusable.

Note that I’m not looking at optimizing the co6 system as much as possible, but at understanding why co6 behaves so wildly…

Fixed: replace controller, add second controller, or use expander? #dev #fix #answer

replace controller, add second controller, or use expander?

I have a Proliant DL380 G6 that I am re-purposing as a Hyper-V host for a new, off-site data center that will host our DR services.

The server currently has a P410i controller with the 512MB BBWC module. The drives installed are SFF 6G 10K drives. I plan to add the HP 516914-B21 drive cage, which gives me 8 more SFF drives, bringing the…

How-to: CentOS 6 doing lots more IO than CentOS 5 #programming #it #dev

CentOS 6 doing lots more IO than CentOS 5

I’m benchmarking an application on two identical servers, one is Centos 5.8 and the other is Centos 6.2. My application is running much slower (50% or less) on the Centos 6.2 machine.

In attempting to diagnose the issue I’m tracking CPU, RAM, and IO throughout the benchmark run. I see that the disk reads are significantly higher on the Centos 6.2 box, as…

Solution: SSD (Intel 530) read/write speed very slow with RAID 10 #answer #development #programming

SSD (Intel 530) read/write speed very slow with RAID 10 Explanation:

We have a Server:

Model: HP ProLiant DL160 G6

4 x 240GB SSD (RAID-10)

72GB DDR3 RAM

2 x L5639

HP P410 RAID Controller (256MB, V6.40, Rom version: 8.40.41.00)

SSD drives are 4 brand new 2.5″ Intel 530 with 540MB/s read speed and 490MB/s write speed

CentOS 6

File systems are ext4

but this is the test result for read speed on raid…

Fix: Convert a Smart Array RAID5 array to a RAID6 (ADG) variant #solution #programming #answer

Convert a Smart Array RAID5 array to a RAID6 (ADG) variant

I have an HP MicroServer (N36L) with a SmartArray P410 controller, a 512MB BBWC unit and four (4) 2TB disks connected. Three of those disks are configured as a single RAID5 array and one is left alone.

I’d like to migrate the RAID5 array to a RAID6 array. Is it possible to migrate it “in place”, without the neet to copy the data to a…