Hard Disk IDs in Linux

Dan Egli ddavidegli at gmail.com
Mon Mar 11 05:35:42 MDT 2013

>I would not recommend using that many drives in a single RAID array.

>failure.  Personally I wouldn't use more than 10 drives per RAID6, but

The idea of stringing the RAIDs together has it's merit. Would I just mdadm
to create a separate /dev/mdX out of the various mdXs already created? I.e.
suppose I put eight drives per array. Using a 32 disk rackmount case gives
me a result of md0 - md3. Would I create an md4 that's a raid 0 of md0 -
md3? Or would I perhaps be better off using logical volume manager (which
I've never used before but can look up if needed).

The thing I was trying to accomplish with the larger array was the large
amount of disk space available. I.e. if I fill the enclosure with 32 4TB
drives and make a single raid 6 I wind up with 120TB of available storage.
On the other hand, if I was to make four equal array of 8 drives each in
raid 6 then I loose not just 8TB total but 8TB per array, or 32TB total,
leaving me with 96TB, which is still a good amount of storage, but also
quite literally only 75% of the disk capacity. If anyone knows a good way
to increase the disk capacity availability to raise it above 75%
(preferably back up to the 90% range) I'm all ears.


--- Dan

P.S. The stars are part of the security I have to go through. I believe it
indicates to anyone looking that the content has been scanned and there is
nothing to flag the message as needing further scrutiny. I did mention how
tight security is here. They are NOT added by my client. However, my client
doesn't send directly to gmail, unfortunately. I can't. I have to go
through the corporate middleman, which is where the stars are getting
added. I've sent a message to the sysadmin asking if he/they can stop using
the stars or there is some way to avoid them appearing in my mails. We'll
see what they say and if it happens.

More information about the PLUG mailing list