True. We have 6 146GB SAS disks in our servers (mirrored root, and 4 data
disks in a RAID 10 setup). If Oracle keeps firing Sun Solaris customers (they
keep trying to fire me but I keep hangin' on) a bunch of us will be joining you
in the Linux file system extravaganza.
Even though I am an ardent Solaris fan, I did not and won't adopt ZFS. UFS
(logging enabled) is bulletproof and works well with SAS HW RAID.
However, many swear by ZFS. Not sure what the status is of bringing that into
the Linux world.
-----Original Message-----
From: Arthur A. Person [mailto:person@xxxxxxxxxxxxx]
Sent: Tue 10/26/2010 12:12 PM
To: Robert Mullenax
Cc: Jeff Lake - Admin; LDM Users
Subject: RE: [ldm-users] high memory
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
