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
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Arthur A. Person
Research Assistant, System Administrator
Penn State Department of Meteorology
email: person@xxxxxxxxxxxxx, phone: 814-863-1563
