alotti [mailto:kilian.cavalotti.w...@gmail.com]
> Sent: Wednesday, January 14, 2015 8:56 PM
> To: Dilger, Andreas
> Cc: Mike Selway; lustre-discuss@lists.lustre.org
> Subject: Re: [Lustre-discuss] Performance dropoff for a nearly full Lustre
> file
> system
>
> Hi all,
On Jan 15, 2015, at 10:26 AM, Mike Selway
wrote:
> Thank you for the explanation. So, by definition ldiskfs will in a
> sense "hide" 5% of the disk capacity? That is, if the usable disk space is
> 500TB, the system will hold aside 25TB? If so, will the file system report
> 475TB us
ilto:andreas.dil...@intel.com]
> Sent: Wednesday, January 14, 2015 8:27 PM
> To: Mike Selway
> Cc: lustre-discuss@lists.lustre.org
> Subject: Re: [Lustre-discuss] Performance dropoff for a nearly full Lustre
> file
> system
>
> Note that due to the nature of spinning disks, you will a
01.png@01CF36E5.85AF42A0]<http://www.cray.com/>
[cid:image005.jpg@01D03099.93BD2340]
From: Bob Ball [mailto:b...@umich.edu]
Sent: Wednesday, January 14, 2015 1:55 PM
To: Mike Selway; lustre-discuss@lists.lustre.org
Subject: Re: [Lustre-discuss] Performance dropoff for a nearly full Lustre file
Hi all,
On Wed, Jan 14, 2015 at 7:27 PM, Dilger, Andreas
wrote:
> Of course, fragmentation also plays a role, which is why ldiskfs will reserve
> 5% of the disk by default to avoid permanent performance loss caused by
> fragmentation if the filesystem gets totally full.
Ashley Pittman gave a p
Note that due to the nature of spinning disks, you will always get a
performance loss as the disk fills up, because the outside of the disk (low
sector numbers) can store more data more quickly than the inside of the disk
(high sector numbers). From graphs that I've seen, the low sector numbers
In my memory, it is not recommended to run Lustre more than 90% full.
bob
On 1/14/2015 2:43 PM, Mike Selway wrote:
Hello,
I’m looking for experiences for what has been observed
to happen (performance drop offs, severity of drops, partial/full
failures, …) when an operational
Hello,
I'm looking for experiences for what has been observed to happen
(performance drop offs, severity of drops, partial/full failures, ...) when an
operational Lustre File System has been almost "filled"... percentages of
interest are in the range from say 80% to 99%. Multiple
