RE: Storage space overheads! - toasters

31 Jul 2006

      Hi all,
Thank you very much.
It seems out of 100GB, what usable space I can have is 55GB (55%).
I feel yauk!
But it seems at this point of time, its the only solution.
I wish NetApp had Raid5, this could have eliminated some issues 
like using 2 dual-parity drives.
Thank you again for your responses about SATA and FC disks.
Cheers,
Marge.
On Fri, 28 Jul 2006 19:19:08 +1000 "Holland, William L" 
HollandWL@state.gov wrote:
...
We have a R200 which has 168 ATA drives.  I expected a high 
failure rate
on these as ATA drives are not rated for continuous duty.  I have 
been
surprised, and pleased, that failure rate has been very low - 
perhaps 3
drives in a year.  Not sure about the SATA.  The way I am moving 
is to
use (S)ATA for my NAS (user shares) and FC drives for hosting my 
iSCSI
LUNs.  Databases need the higher performance of FC, simple file 
shares
do not.
-----Original Message-----
From: owner-toasters@mathworks.com [mailto:owner-
toasters@mathworks.com]
On Behalf Of margesimpson@hushmail.com
Sent: Thursday, July 27, 2006 10:00 PM
To: toasters@mathworks.com
Subject: RE: Storage space overheads!
Hi Glenn D, Glenn W,  Andrew, Michael, Holland and Holland, Thank 
you
all for your feeback.
To summarize, the following is true (i.e., about storage
sacrifice):

Disk are right sized (realigning size in blocks from different

vendors...eg., for 72GB we get 68GB) before using by NetApp.

dual parity (2 disks on RG of 16 => 14D+2P)
spare disk/s
WAFL & RAID overhead (~ 5%).
aggr reserve 5% default
vol snapshot reserve	20% default
for LUNs: 50% for base snapshot + extra space 20% of remaining

data space

user data should always be below 90% to avoid performance

bottleneck
and defrag issues.
That's sounds bad to me, but if you all feel to be true then its 
must be
a solution.
How about putting SATA disks on the primary filers to save costs? 
Whats are the problems in replacing FC disks with SATA?
Whats record about SATA disks, I heard they are terrible? (Failure
...
rates
is abnormal)
Thanks again for feedback.
Marge.
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