From: Jesper Krogh <jesper@krogh.cc>
To: Scott Marlowe <scott.marlowe@gmail.com>
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 07:29:31 +0100
Message-ID: <47DA1B4B.6020800@krogh.cc> (raw)
In-Reply-To: <dcc563d10803132319u19480a4fn16115c415ee57844@mail.gmail.com>
References: <f966c2ee0803052142l6a105678jfe2da92a0d9371@mail.gmail.com>
<Pine.GSO.4.64.0803060813570.11897@westnet.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>
Scott Marlowe 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
It is on a 64 bit machine.. but ext3 doesnt have anything specifik in it
as far as I know.. I have mountet filesystems created on 32 bit on 64
bit and the other way around. The filesystems are around years old.
http://en.wikipedia.org/wiki/Ext3 => Limit seems to be 16TB currently
(It might get down to something lower if you choose a small blocksize).
--
Jesper
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To: pgsql-performance@postgresql.org
Cc: jesper@krogh.cc, scott.marlowe@gmail.com, justin@emproshunts.com
Subject: Re: Benchmark: Dell/Perc 6, 8 disk RAID 10
In-Reply-To: <47DA1B4B.6020800@krogh.cc>
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