[CentOS] RAID help

Thu Dec 16 07:15:00 UTC 2010
Philix T A <philixlinux at gmail.com>

1) RAID 1 is good for reading while writing is a overhead for the disk and
may hit the performance
2) Dont create RAID for swap and / root partition (Not Advisable)
3) Swap Size size should be 2X the size of the Physical memory
4) Always partition which uses high read/write to the disk  eg /var/log
/var/www/html  and /home etc
5) Use LVM for partitions and swap where your Video files resides and make
it minimum as of now and Learn the growth of the partition and increase as
per requirement
6) My experience had always shown if your apps had memory leak , expect
Swapping to happen for sure,  where reboot of the apps or the system is


On Wed, Dec 15, 2010 at 12:07 AM, Jason T. Slack-Moehrle <
slackmoehrle at me.com> wrote:

> Hi All,
> I have a new system with 2 Seagate 1TB SATA Enterprise level drives in it.
> I want to RAID1 (mirror) these drives.
> This machine will be a web-server in my apartment hosting an HTML video fan
> site I am creating. Apache, MySQL, PHP etc. This site will easily be 300+
> gigs with all the versions of each video, the MySQL won't be huge, but will
> grow as data for each video is added (i.e location on the server, keyframe
> name, etc)
> I am a bit confused by:
> http://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-raid-config.html
> So if I simplify, I must:
> 1. Create a software raid partition on each drive
> 2. Create a RAID 1 out of that partition and use a mount point of /boot
> 3. Create other mount points I might want i.e swap, /home, etc
> 4. Create RAID1 out of these partitions
> 5. rinse and repeat this for each mount point I want
> A few questions:
> 1. This system support 16gb of RAM. I have 9gb in it, but I will max it out
> over the next few months as I find great deals on RAM, what should my SWAP
> space be? I recall a long while ago that SWAP should match physical RAM.
> 2. Any reason I can't just create a single mount point taking up the entire
> drive and RAID1 the entire thing? Can anyone recommend some ideal mount
> points and sizes?
> 3. What should I account for if my /var/www/html will be very large?
> Best,
> -Jason
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