RE: Change Raid Settings

There is going to certainly be a performance hit with Raid6, as you have two sets of parity for each raid set. Personally, I recommend all our clients to Raid5 with Hot Spare, and it is how we run all our internal machines as well.

Pete

--
Pete Massiello
iTech Solutions
http://www.itechsol.com
http://www.iInTheCloud.com




-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jeff Crosby
Sent: Wednesday, September 25, 2013 9:48 AM
To: Midrange Systems Technical Discussion
Subject: Re: Change Raid Settings

The ServIT guy stopped by. They agree with everything you say here, which increases my confidence in them. (I already have confidence in youse guys.)

They also say I could go to RAID 6 with a hot spare. Without a system reload. With a SAVE 21 first. So I could lose 2 drives in each RAID set and still be good. I asked about a performance hit and he's going to look into that.


On Tue, Sep 24, 2013 at 11:29 AM, DrFranken <midrange@xxxxxxxxxxxx> wrote:

So the set with some drives with no stripe (the model -070 guys have
no
stripe) is easy. Go into SST work with Disk Units and Work with Disk
configuration and work with removing disk units. Pick one and remove
from ASP. In a couple hours or less it will "Go Away". Once that
happens pick the drive also and remove it from RAID. (I THINK This
step will require DST but brain fuzzy on SCSI) Now Start Hot Spare. Done.

The set with all drives striped will require you to end RAID and
that's more 'risky' so you'll want a full SAVE 21 first. Then Pick a
drive, remove from ASP, when it's gone then do END RAID on that set
(see the risky part?) Now tell it to start RAID with Hot Spare. Done.

- Larry "DrFranken" Bolhuis

www.frankeni.com
www.iDevCloud.com
www.iInTheCloud.com

On 9/24/2013 8:53 AM, Jeff Crosby wrote:

*This message was transferred with a trial version of CommuniGate(r)
Pro* Yesterday we had a disk failure at 4:27pm, which happens to be
3 minutes before we run our entire days business. Good timing, eh?
We ran everything and then replaced the drive and rebuilt the RAID.
I honestly don't remember the last time we had a disk failure before this.

Our System i 520 is on i 7.1 and has 16 drives in it. There are 2
RAID sets with 8 drives each. Disk utilization is less than 19% so
we have plenty of space. (We used to have an IXS way back when,
which is why

we're

way over capacity on disk.)

The service guy (ServIT) thought, since we're on 7.1, it might be

possible

to change each of those 8-drive RAID sets to a 7-drive RAID set with
a

hot

spare. I questioned him because of the age of our hardware and said
he still thought it was possible. He's going to look into it today.

Since there are some very smart hardware people on this list, I'm
going

to

ask here. Can that be done? Can that be done without a reload?


Thanks.

--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing
list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe,
unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take
a moment to review the archives at
http://archive.midrange.com/midrange-l.

--
Jeff Crosby
VP Information Systems
UniPro FoodService/Dilgard
P.O. Box 13369
Ft. Wayne, IN 46868-3369
260-422-7531
www.dilgardfoods.com

The opinions expressed are my own and not necessarily the opinion of my company. Unless I say so.
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at http://archive.midrange.com/midrange-l.