From: Scott Marlowe <scott.marlowe@gmail.com>
To: Jesper Krogh <jesper@krogh.cc>
Cc: justin <justin@emproshunts.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: Benchmark: Dell/Perc 6, 8 disk RAID 10
Date: Fri, 14 Mar 2008 00:23:28 -0600
Message-ID: <dcc563d10803132323j7904d4ddoe526383d65fc1d4e@mail.gmail.com> (raw)
In-Reply-To: <dcc563d10803132319u19480a4fn16115c415ee57844@mail.gmail.com>
References: <f966c2ee0803052142l6a105678jfe2da92a0d9371@mail.gmail.com>
<47D00DB2.7040007@emolecules.com>
<18451.1204824562@sss.pgh.pa.us>
<47D0AFC1.5070305@emolecules.com>
<08115901408538@mail.emproshunts.com>
<47D93A43.6020503@emolecules.com>
<016301c8854e$851e06e0$3101a8c0@JDell>
<dcc563d10803132312o1539215fk859bbae03f36e566@mail.gmail.com>
<47DA1866.3050500@krogh.cc>
<dcc563d10803132319u19480a4fn16115c415ee57844@mail.gmail.com>
On Fri, Mar 14, 2008 at 12:19 AM, Scott Marlowe <scott.marlowe@gmail.com> wrote:
>
> On Fri, Mar 14, 2008 at 12:17 AM, Jesper Krogh <jesper@krogh.cc> wrote:
> >
> > Scott Marlowe wrote:
> > > On Thu, Mar 13, 2008 at 3:09 PM, justin <justin@emproshunts.com> wrote:
> > >
> > >> I chose to use ext3 on these partition
> > >
> > > You should really consider another file system. ext3 has two flaws
> > > that mean I can't really use it properly. A 2TB file system size
> > > limit (at least on the servers I've tested) and it locks the whole
> > > file system while deleting large files, which can take several seconds
> > > and stop ANYTHING from happening during that time. This means that
> > > dropping or truncating large tables in the middle of the day could
> > > halt your database for seconds at a time. This one misfeature means
> > > that ext2/3 are unsuitable for running under a database.
> >
> > I cannot acknowledge or deny the last one, but the first one is not
> > true. I have several volumes in the 4TB+ range on ext3 performing nicely.
> >
> > I can test the "large file stuff", but how large? .. several GB is not a
> > problem here.
>
> Is this on a 64 bit or 32 bit machine? We had the problem with a 32
> bit linux box (not sure what flavor) just a few months ago. I would
> not create a filesystem on a partition of 2+TB
>
OK, according to this it's 16TiB:
http://en.wikipedia.org/wiki/Ext2
so I'm not sure what problem we were having. It was a friend setting
up the RAID and I'd already told him to use xfs but he really wanted
to use ext3 because he was more familiar with it.
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To: pgsql-performance@postgresql.org
Cc: scott.marlowe@gmail.com, jesper@krogh.cc, justin@emproshunts.com
Subject: Re: Benchmark: Dell/Perc 6, 8 disk RAID 10
In-Reply-To: <dcc563d10803132323j7904d4ddoe526383d65fc1d4e@mail.gmail.com>
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