[ale] backup/restore mail from USB external drive

[Lightner, Jeff]

If possible I try to segregate "OS" from "applications" so usually would have 2 virtual drives on PERC unless I wasn't planning on having applications on internal drives (i.e. only using external drives).

It helps to prevent disk hungry applications from being allowed to use all of the space your OS might someday require by putting the virtual drives in two different VGs.  (Of course the first one is usually partitioned so that /boot is on a partition rather than in LVM so the second partition in the first virtual is allocated to the VG that has /root, /usr, /var, /tmp, /opt).

There are those who will tell you PERC (hardware RAID OEM from LSI) is actually not as fast a software raid (md).   I've not experimented with it myself - typically if we have apps that need high performance they're being presented from our disk array via fibre HBAs.  If you are seeing significant failures on your PERC stuff and they don't support RAID 6 or RAID 10 you might want to present your disks as JBOD then use software raid to get the desired RAID level.






-----Original Message-----
From: ale-bounces at ale.org [mailto:ale-bounces at ale.org] On Behalf Of John Heim
Sent: Thursday, February 13, 2014 11:45 AM
To: Atlanta Linux Enthusiasts
Subject: Re: [ale] backup/restore mail from USB external drive

On 02/12/14 17:37, Jeff Hubbs wrote:
> On 2/12/14, 5:00 PM, Lightner, Jeff wrote:
>> <snip>
>>
>> You really should be using RAID6 or RAID10 rather than RAID5 as it is
>> even more redundant (i.e. can survive 2 disks failures).
>>
> And you shouldn't be using RAID5 or RAID6 at all if your drives are
> 750-1000GB or larger.
> >>>>>

Our disks are 600Gb.

Is there any advantage to using the PERC to create 2 virtual disks from the RAID array? Or should I partition it in the OS? Right now, the PERC is configured with one virtual disk for the operating system and another for the mail. But I could make one big virtual disk out of  the 5 physical disks which would show up as a 2Tb /dev/sda. Then I could use the installer to partition it.
to partition it.



--
John Heim
email: john at johnheim.com  skype: john.g.heim

_______________________________________________
Ale mailing list
Ale at ale.org
http://mail.ale.org/mailman/listinfo/ale
See JOBS, ANNOUNCE and SCHOOLS lists at
http://mail.ale.org/mailman/listinfo




Athena(r), Created for the Cause(tm)
Making a Difference in the Fight Against Breast Cancer

---------------------------------
CONFIDENTIALITY NOTICE: This e-mail may contain privileged or confidential information and is for the sole use of the intended recipient(s). If you are not the intended recipient, any disclosure, copying, distribution, or use of the contents of this information is prohibited and may be unlawful. If you have received this electronic transmission in error, please reply immediately to the sender that you have received the message in error, and delete it. Thank you.
----------------------------------