Solid State Drives in HPC: Reducing the I/O Bottleneck
This Sun BluePrints article (registration required) compares traditional hard disk drives (HDDs) and the newer solid state drive (SSD) technology in high-performance computing (HPC) applications. SSD devices can help correct the imbalance between processor and storage speed while also reducing energy usage and environmental impact.
We are wondering if we are facing performance issue in our server when running Informatica jobs. Two things to suspect:
cache memory never comes down even when Top shows > 99% used.
There is some contention io or network related or Cache is clogged
top - 20:58:20 up 16 days, ... (3 Replies)
hi all,
anyone knows how to test ssd using iozon, I am currently running iozone and I don't know if it is testing the ssd or just the RAM...
anyone knows a good tutorial (like a step-by-step)?
cannot find any in google..
Thanks! (3 Replies)
hi all,
My server box is slow running. I have provide some statistics below:
Where is the bottleneck on the server?
I guess the bottleneck is disk I/O?
bash-3.00# prstat -Z
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
29206 mobi1 334M 264M sleep ... (8 Replies)
Hello,
I have few HDD and SSD installed in my RHEL 5 server. I want to know which disk are SDD and which are HDD. What command should I use?
Thanks (3 Replies)
Hi All,
I would like to create a script that will monitor the server if it's heavy on the processing. I have already some scripts for monitoring disk capacity, application monitoring, etc but not on the bottleneck of the server processing.
I don't know which one to measure/query.
Can you... (2 Replies)
HD(4) Linux Programmer's Manual HD(4)NAME
hd - MFM/IDE hard disk devices
DESCRIPTION
The hd* devices are block devices to access MFM/IDE hard disk drives in raw mode. The master drive on the primary IDE controller (major
device number 3) is hda; the slave drive is hdb. The master drive of the second controller (major device number 22) is hdc and the slave
hdd.
General IDE block device names have the form hdX, or hdXP, where X is a letter denoting the physical drive, and P is a number denoting the
partition on that physical drive. The first form, hdX, is used to address the whole drive. Partition numbers are assigned in the order
the partitions are discovered, and only non-empty, non-extended partitions get a number. However, partition numbers 1-4 are given to the
four partitions described in the MBR (the `primary' partitions), regardless of whether they are unused or extended. Thus, the first logi-
cal partition will be hdX5. Both DOS-type partitioning and BSD-disklabel partitioning are supported. You can have at most 63 partitions
on an IDE disk.
For example, /dev/hda refers to all of the first IDE drive in the system; and /dev/hdb3 refers to the third DOS `primary' partition on the
second one.
They are typically created by:
mknod -m 660 /dev/hda b 3 0
mknod -m 660 /dev/hda1 b 3 1
mknod -m 660 /dev/hda2 b 3 2
...
mknod -m 660 /dev/hda8 b 3 8
mknod -m 660 /dev/hdb b 3 64
mknod -m 660 /dev/hdb1 b 3 65
mknod -m 660 /dev/hdb2 b 3 66
...
mknod -m 660 /dev/hdb8 b 3 72
chown root:disk /dev/hd*
FILES
/dev/hd*
SEE ALSO mknod(1), chown(1), mount(8), sd(4)Linux 1992-12-17 HD(4)
