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RE: maxing out the filesystem
by Glenn Dekhayser 25 Feb '06

25 Feb '06

Actually, the aggregate snap reserve is by default only 5%, not 10%. I have never seen a volume go over 100% usage, in fact the filer yells at you and could take the volume offline if it can't write data. Are you sure you're not talking about consumption of the snap reserve, which CAN go over 100%? Glenn "It's worth remembering that ONTAP already imposes a 10% reserve on the filing system size (including snapshot reserve); or on the sum of sizes, for flexible volumes in an aggregate. A "100% full" tradvol/aggregate is actually only using 90% of the blocks on the discs. Or looked at another way, the difference in congestion between "90% full" and "100% full" is 2:1, not infinity:1.: "Blake Golliher" <thelastman(a)gmail.com> writes: > A filer can be written to over 100% space utilization, it'll just keep > growing. I've seen filers go up tot 107% space utilization before. and "George, Andrew" <georgea(a)anz.com> replies: > Interesting > We run a fair few filers in the 97%-99% arena, mainly as CIFS NAS devices. > Every time I've seen it hit 100% 0 bytes available CIFS has refused to > save anything. That's my experience, with NFS. I would be interested (from a theoretical point of view!) to know how Blake gets the space utilisation that high. (Snapshot usage vs reserve as shown by "df" can go over 100%, of course.) -- Chris Thompson Email: cet1(a)cam.ac.uk

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RE: Aggregate size question
by Willeke, Jochen 24 Feb '06

24 Feb '06

Hi William, we have the same drives as you have, those so called '144 GB' ones :-) When performing a sysconfig -r the filer showed me those 137 GB and i, young as i am, thought that the filer already made the conversion to binary for me. By rule of thumb this number seemed to be correct to me. Well with a drive capacity of 134 i really get close to what i am locking for! Thanks a lot and a nice weekend Jochen -----Original Message----- From: Holland, William L [mailto:hollandwl@state.gov] Sent: Friday, February 24, 2006 1:15 PM To: Willeke, Jochen; toasters(a)mathworks.com Subject: RE: Aggregate size question Are you sure they are 137GB? We have 144GB drives in our system and OnTap reports them as 133GB. The discrepancy is that drive manufacturers report capacity in base 10 rather than binary. Therefore, drive manufacturers report 144,000,000,000 as 144GB when in reality it is 144,000,000,000/1024^3 == 134GB. In the "real" world giga = 1 billion in the computing world gig = 1024^3 or 1,073,741,824 bytes. If you use 134 instead of 137 for your calculations you will come out pretty close to what the filer is showing you for results. Also, I don't think it is x .9 THEN x .95. If you use 1=34GB drives and x .85 (10% + 5%) you will only be off by 8GB. -----Original Message----- From: owner-toasters(a)mathworks.com [mailto:Jochen.Willeke@wincor-nixdorf.com] Sent: Friday, February 24, 2006 7:04 AM To: toasters(a)mathworks.com Subject: Aggregate size question Hi everyboby, i have a little question about aggregate sizing. I have a aggregate called aggr1 consisting of 24 disks â 137 GB hosted on a FAS920c running Ontap 7.0.1R1. As i have 2 raidgroups 4 disks are parity. I took the 20 left disks and calculated the following: 20 (disks) x 137 GB (size) x 0,90 (10% WAFL) x 0,95 (5% Aggr Snapshot) = 2342,7 GB When i perform a 'df -Ahr' i only see this: df -Ahr Aggregate total used avail reserved aggr1 2270GB 1924GB 346GB 0GB aggr1/.snapshot 119GB 34GB 84GB 0GB So i have a difference of about 70 GB between my result and the total which Ontap shows me. Ok, 70 GB won't make the world turn faster :-) but i would like to understand why i am missing 70 GB. Thanks in advance Jochen

5 4

RE: maxing out the filesystem
by Glenn Dekhayser 24 Feb '06

24 Feb '06

I understand that Netapp support is very adamant about leaving them on. They can restore the entire system, in case of file system corruption (or so I've heard). Which of course raises the question, is the risk of file system corruption so great that they hold back 5% of the aggregate data space to protect against it? It's never happened to me.... .....so I turn it off too. :) Glenn Subject: Re: maxing out the filesystem Max wrote: > Does anyone here use aggregate snap reserves ? I was under the impression > that is was only useful for sync mirror setups... So I usually just shut > it off to take advantage of the extra space. We set aggr snap reserves to 0% as you said, I believe they are only needed for sync mirror and otherwise can be disabled. -skottie -- Scott Miller skottie(a)anim.DreamWorks.com

1 0

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24 Feb '06

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1 0

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24 Feb '06

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RE: Aggregate size question
by Holland, William L 24 Feb '06

24 Feb '06

Are you sure they are 137GB? We have 144GB drives in our system and OnTap reports them as 133GB. The discrepancy is that drive manufacturers report capacity in base 10 rather than binary. Therefore, drive manufacturers report 144,000,000,000 as 144GB when in reality it is 144,000,000,000/1024^3 == 134GB. In the "real" world giga = 1 billion in the computing world gig = 1024^3 or 1,073,741,824 bytes. If you use 134 instead of 137 for your calculations you will come out pretty close to what the filer is showing you for results. Also, I don't think it is x .9 THEN x .95. If you use 1=34GB drives and x .85 (10% + 5%) you will only be off by 8GB. -----Original Message----- From: owner-toasters(a)mathworks.com [mailto:Jochen.Willeke@wincor-nixdorf.com] Sent: Friday, February 24, 2006 7:04 AM To: toasters(a)mathworks.com Subject: Aggregate size question Hi everyboby, i have a little question about aggregate sizing. I have a aggregate called aggr1 consisting of 24 disks â 137 GB hosted on a FAS920c running Ontap 7.0.1R1. As i have 2 raidgroups 4 disks are parity. I took the 20 left disks and calculated the following: 20 (disks) x 137 GB (size) x 0,90 (10% WAFL) x 0,95 (5% Aggr Snapshot) = 2342,7 GB When i perform a 'df -Ahr' i only see this: df -Ahr Aggregate total used avail reserved aggr1 2270GB 1924GB 346GB 0GB aggr1/.snapshot 119GB 34GB 84GB 0GB So i have a difference of about 70 GB between my result and the total which Ontap shows me. Ok, 70 GB won't make the world turn faster :-) but i would like to understand why i am missing 70 GB. Thanks in advance Jochen

2 1

Aggregate size question
by Willeke, Jochen 24 Feb '06

24 Feb '06

Hi everyboby, i have a little question about aggregate sizing. I have a aggregate called aggr1 consisting of 24 disks â 137 GB hosted on a FAS920c running Ontap 7.0.1R1. As i have 2 raidgroups 4 disks are parity. I took the 20 left disks and calculated the following: 20 (disks) x 137 GB (size) x 0,90 (10% WAFL) x 0,95 (5% Aggr Snapshot) = 2342,7 GB When i perform a 'df -Ahr' i only see this: df -Ahr Aggregate total used avail reserved aggr1 2270GB 1924GB 346GB 0GB aggr1/.snapshot 119GB 34GB 84GB 0GB So i have a difference of about 70 GB between my result and the total which Ontap shows me. Ok, 70 GB won't make the world turn faster :-) but i would like to understand why i am missing 70 GB. Thanks in advance Jochen

1 0

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24 Feb '06

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24 Feb '06

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1 0

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23 Feb '06

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