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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
Current content can be found at unidata.ucar.edu.
To learn about what's going on, see About the Archive Site.
Robert, On Tue, 26 Oct 2010, Robert Mullenax wrote:
I personally think that most folks could benefit from spending less on tons of RAM and instead going to SAS instead of SATA systems. SATA is certainly better than old IDE, but if you have multiple feeds coming in, decoding of data, and clients getting data via NFS, then SAS is far better.
agreed... except it's cost-prohibitive for large arrays.
Art
-----Original Message----- From: ldm-users-bounces@xxxxxxxxxxxxxxxx on behalf of Arthur A. Person Sent: Tue 10/26/2010 8:31 AM To: Jeff Lake - Admin Cc: LDM Users Subject: Re: [ldm-users] high memory Jeff, Depending on how heavily your system is loaded, you may be piling up too much I/O onto one array. The LDM queue itself can be pretty demanding of the array, and then you have data coming off the disk out of the queue again to be decoded (although some/most of that should be cached) and then you're writing data back out to the array filing raw/decoded data. It all comes down the the number of I/O's/second your device can handle... if it's just two SATA disks in a mirror, it's limited. The first thing I would try is moving your LDM queue to your third drive and then monitor I/O's/second to the drives during peak use. Art On Tue, 26 Oct 2010, Jeff Lake - Admin wrote: >> Do you have separate system disk from data, or does everything run off one >> mirror? How many disks are in your mirror? Is your LDM queue running off >> the same array as the OS and data? >> >> Art >> > > -sh-3.2$ df -h > Filesystem Size Used Avail Use% Mounted on > /dev/sda6 480G 88G 392G 18% /home2 > /dev/sda5 448G 72G 353G 17% / > /dev/sda2 2.0G 36M 1.9G 2% /tmp > /dev/sda1 99M 13M 81M 14% /boot > tmpfs > > ldm, sql, and assorted scripts on / > ldm queue and data directory on /home2 > > I do have a 3rd drive that I haven't mounted yet > > Arthur A. Person Research Assistant, System Administrator Penn State Department of Meteorology email: person@xxxxxxxxxxxxx, phone: 814-863-1563 _______________________________________________ ldm-users mailing list ldm-users@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/
Arthur A. Person Research Assistant, System Administrator Penn State Department of Meteorology email: person@xxxxxxxxxxxxx, phone: 814-863-1563
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