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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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I refuse to use NFS. It's even worse than ext3 for IO :) -Tyler On Tue, Oct 26, 2010 at 12:12 PM, Arthur A. Person <person@xxxxxxxxxxxxx> wrote: > 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 > _______________________________________________ > ldm-users mailing list > ldm-users@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ >
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