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no space left on device

I'm running Postgres 7.1.3, and just started having a problem where my
dynamic site is going down (read-only DB, with no writes happening to the
DB) regularly (every other day). I have no idea whay this is happening,
and my search of the FAQ's and mail list don't bring up anything. i've
attached the error from the log file, at the end of this message.

Here's an output of the disk usage from within the DB dir

[postgres - DB]$ du -k .
1716 ./base/1
1716 ./base/16555
5192 ./base/56048
8628 ./base
116 ./global
32812 ./pg_xlog
11380 ./pg_clog
53192 .

Note that the pg_xlog dir is huge! Here's its contents:

[postgres - DB/pg_xlog]$ ls -al
total 32816
drwx------ 2 postgres admin 4096 Mar 29 2003 .
drwx------ 6 postgres admin 4096 Jan 9 15:04 ..
-rwx------ 1 postgres admin 16777216 Jan 9 15:09 000000000000000 1
-rwx------ 1 postgres admin 16777216 Mar 29 2003 000000000000000 2

What are these files, and what can I do to resolve this issue?

Thx,

Zeb
--
DEBUG: statistics collector process (pid 2523) exited with exit code 1
PGSTAT: Error closing temp stats file
PGSTAT: /usr/local/G101/App/DB/./global/pgstat.tmp.7823 : No space left on
device
PGSTAT: AbDEBUG: statistics collector process (pid 2979) exited with exit
code
1
FATAL 2: write of clog file 43, offset 188416 failed: No space left on
device
DEBUG: server process (pid 3741) exited with exit code 2
DEBUG: terminating any other active server processes
NOTICE: Message from PostgreSQL backend:
The Postmaster has informed me that some other backend
died abnormally and possibly corrupted shared memory.
I have rolled back the current transaction and am
going to terminate your database system connection and exit.
Please reconnect to the database system and repeat your query.
NOTICE: Message from PostgreSQL backend:
The Postmaster has informed me that some other backend
died abnormally and possibly corrupted shared memory.
I have rolled back the current transaction and am
going to terminate your database system connection and exit.
Please reconnect to the database system and repeat your query.
NOTICE: Message from PostgreSQL backend:
The Postmaster has informed me that some other backend
died abnormally and possibly corrupted shared memory.
I have rolled back the current transaction and am
going to terminate your database system connection and exit.
Please reconnect to the database system and repeat your query.
DEBUG: all server processes terminated; reinitializing shared memory and
semaph
ores
DEBUG: database system was interrupted at 2004-01-09 05:22:52 EST
DEBUG: checkpoint record is at 0/138CFD4
DEBUG: redo record is at 0/138CFD4; undo record is at 0/0; shutdown FALSE
DEBUG: next transaction id: 45811837; next oid: 65205
DEBUG: database system was not properly shut down; automatic recovery in
progre
ss
DEBUG: redo starts at 0/138D014
FATAL 2: write of clog file 43, offset 188416 failed: No space left on
device
DEBUG: startup process (pid 3785) exited with exit code 2
DEBUG: aborting startup due to startup process failure

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Nov 12 '05
27 20071
On Fri, Jan 09, 2004 at 01:11:51PM -0800, Aurangzeb M. Agha wrote:
I've not run a vacuum in quite some time, and that's because I've only
been doing reads from this DB. I was under the impression that I should
run vacuum when tables are heavily modified:

http://www.postgresql.org/docs/aw_pg...k/node110.html


Another reason to vacuum is that the pg_clog files are deleted if they
are no longer needed. So if you had vacuumed, there would be less files
there (I'm not sure if this was the case on 7.1 though).

Maybe in the meantime you could move one of the pg_xlog files to another
filesystem and make a symlink to the correct position. That should given
you some breathing room. Vacuum right after that.

Also keep in mind that deleted files that are kept open by running
processes do not release the occupied space ... see if you have some
process with an open file on that filesystem which is no longer present
(some clever usage of fuser and ps should give you that info)

--
Alvaro Herrera (<alvherre[a]dcc.uchile.cl>)
"We are who we choose to be", sang the goldfinch
when the sun is high (Sandman)

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Nov 12 '05 #11
> Wait... from the df you provided you have space left on the device:

postgres - DB]$ df -m .
Filesystem 1M-blocks Used Available Use% Mounted on
- 63328 55308 4803 93% /

Perhaps you are out of inodes?

Remember that df shows the *total* space left on the device,
especially when run as root. Some percent are reserved for
root, however, AFAIR pretty much exactly 7% in my experience,
eg. user postgres can't use them but rather sees a device
that's out of space. That may be the case here.

Karsten
--
GPG key ID E4071346 @ wwwkeys.pgp.net
E167 67FD A291 2BEA 73BD 4537 78B9 A9F9 E407 1346

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Nov 12 '05 #12
On Fri, 9 Jan 2004, Aurangzeb M. Agha wrote:
:That's normal. 32 meg isn't really that big. How big of a partition do
:you have this database on? Your best bet is to put it on a bigger
:partition. the pg_xlog directory is gonna be at least 16 megs for most
:installations.
:
:Do you have any transactions sitting at idle keeping postgresql from
:recycling the xlogs?
:
:Normally when you run out of space it's a lack of vacuuming, but here it
:just sounds like either the partition is too small or the postgres user is
:living under a quota on that partition.

Scott -- I'm at 93% disk usage:

[postgres - DB]$ df -m .
Filesystem 1M-blocks Used Available Use% Mounted on
- 63328 55308 4803 93% /
Do you have root access to it? if so, set the reserved space for root to
be 0%, and then try vacuuming. Vacuuming requires some free space, and
since you're pretty much out, it isn't gonna be able to complete.
I don't know about transactions sitting idle--like I mentioned this DB is
read-only, and there's no writes taking place. Would I still need to
worry about transactions? How can I check to see if there are any?
If you stop and restart it all transactions that are holding will be
disconnected, so that would clear that up.

But it looks to me like you just have it on too small of a partition. On
a modern multi-gigabyte hard drive, Postgresql's usage of tens of megs for
transactions logs is no big deal, but on a smaller partition like yours it
can cause problems.
Re vacuuming, I haven't run vacuum for the same reason as above. This is
only a read-only DB, and I didn't think a vacuum was necessary if there's
no writes happening to the DB.


Well, if the database has been emptied and refilled it would use the
space, so it might be something like that. Or that it was right on the
edge of being out of space and some single alter user kinda thing drove
it over the edge. Hard to say. It looks like your individual databases
are pretty small, so I doubt there's lots of lost space in them.

Can you get a larger partition to move the data directory to on that box?
I'd recommend having about twice the max size of your database as a
minimum, which would be 120 to 150 megs for you.
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Nov 12 '05 #13
"Joshua D. Drake" <jd@commandprom pt.com> writes:
Perhaps you are out of inodes?


Either that or he's hitting a per-user quota limit, which is perhaps
more likely.

regards, tom lane

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Nov 12 '05 #14
On Fri, 9 Jan 2004, Aurangzeb M. Agha wrote:
Here's the output of "df -m":

[postgres - DB]$ df -m .
Filesystem 1M-blocks Used Available Use% Mounted on
- 63328 55308 4803 93% /

But your du, below, of the postgres data directory shows 53MB in use. That's an
order of magnitude smaller than the 55GB the above appears to be saying is used
in the db.

Start again with du -sk /* and follow the biggest numbers.

Ideas:

- have you logfiles that processes, such as postmaster, are writing to and
have got huge?

- did you have the above and you deleted such files without restarting the
process that was writing to the deleted files?

- /var/(mail|tmp|whate ver) is huge due to huge amounts of email recieved and
not deleted

- /home/whatever is huge due to logfiles, downloads (inc. application caches),
datafiles, software builds, ...
--
Nigel Andrews
Thx for the info.
Rgs,

Aurangzeb
On Fri, 9 Jan 2004, Richard Huxton wrote:

:On Friday 09 January 2004 20:31, Aurangzeb M. Agha wrote:
:> I'm running Postgres 7.1.3, and just started having a problem where my
:> dynamic site is going down (read-only DB, with no writes happening to the
:> DB) regularly (every other day). I have no idea whay this is happening,
:> and my search of the FAQ's and mail list don't bring up anything. i've
:> attached the error from the log file, at the end of this message.
:>
:> Here's an output of the disk usage from within the DB dir
:>
:> [postgres - DB]$ du -k .
:> 1716 ./base/1
:> 1716 ./base/16555
:> 5192 ./base/56048
:> 8628 ./base
:> 116 ./global
:> 32812 ./pg_xlog
:> 11380 ./pg_clog
:> 53192 .
:
:OK, and what does "df -m" show? That will display disk sizes and free space
:remaining. Your error is that you have run out of disk space.
:
:> Note that the pg_xlog dir is huge! Here's its contents:
:
:Well - it's 32MB (2 x 16MB as you show below).
:
:> -rwx------ 1 postgres admin 16777216 Jan 9 15:09 000000000000000 1
:> -rwx------ 1 postgres admin 16777216 Mar 29 2003 000000000000000 2
:>
:> What are these files, and what can I do to resolve this issue?
:
:They're transaction logs (see the section on WAL). You can probably reduce
:them from their default size of 16MB, I'm guessing by changing some constant
:in the source and re-compiling.
:
:

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Nov 12 '05 #15

On Fri, 9 Jan 2004, Aurangzeb M. Agha wrote:

Scott -- I'm at 93% disk usage:

[postgres - DB]$ df -m .
Filesystem 1M-blocks Used Available Use% Mounted on
- 63328 55308 4803 93% /

BTW, don't do -m with df it confuses us old folk, as you probably noticed from
the responses.

:)
--
Nigel
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Nov 12 '05 #16
Right! Thus my quandry.

Re inodes, how can I check this? But why would this be? Is Postgres
sucking up inodes just sitting there as a read-only DB?

AMA

On Fri, 9 Jan 2004, Joshua D. Drake wrote:

:Hello,
:
: Wait... from the df you provided you have space left on the device:
:
:postgres - DB]$ df -m .
:Filesystem 1M-blocks Used Available Use% Mounted on
:- 63328 55308 4803 93% /
:
:Perhaps you are out of inodes?
:
:Sincerely,
:
:Josuha D. Drake
:
:
:
:
:Aurangzeb M. Agha wrote:
:
:>No, I've not added any new DB's. In fact, what's puzzling is that this DB
:>has been running without issue (except for one server restart) for the
:>last nine months. Now, all of a sudden, with no DB changes, additions,
:>etc... I'm getting this problem.
:>
:>Do you suggest that I still run a vacuumdb?
:>
:>Rgs,
:>
:>Zeb
:>
:>
:>
:>On Fri, 9 Jan 2004, Joshua D. Drake wrote:
:>
:>:Aurangzeb M. Agha wrote:
:>:
:>:>I've not run a vacuum in quite some time, and that's because I've only
:>:>been doing reads from this DB. I was under the impression that I should
:>:>run vacuum when tables are heavily modified:
:>:>
:>:>
:>:
:>:That would be accurate. Did you recently add a second database?
:>:
:>:Sincerely,
:>:
:>:Joshua D. Drake
:>:
:>:
:>:>http://www.postgresql.org/docs/aw_pg...k/node110.html
:>:>
:>:>I guess I must have been mistaken?
:>:>
:>:>I'm looking through the docs now, but am having trouble finding this: how
:>:>can I vacuum the entire DB at once?
:>:>
:>:>Thx,
:>:>
:>:>Zeb
:>:>
:>:>On Fri, 9 Jan 2004, Joshua D. Drake wrote:
:>:>
:>:>:
:>:>:>
:>:>:>Note that the pg_xlog dir is huge! Here's its contents:
:>:>:>
:>:>:>[postgres - DB/pg_xlog]$ ls -al
:>:>:>total 32816
:>:>:>drwx------ 2 postgres admin 4096 Mar 29 2003 .
:>:>:>drwx------ 6 postgres admin 4096 Jan 9 15:04 ..
:>:>:>-rwx------ 1 postgres admin 16777216 Jan 9 15:09 000000000000000 1
:>:>:>-rwx------ 1 postgres admin 16777216 Mar 29 2003 000000000000000 2
:>:>:>
:>:>:>What are these files, and what can I do to resolve this issue?
:>:>:>
:>:>:>
:>:>:The are check_point files. You need them. Have you ran a vacuum recently?
:>:>:
:>:>:Sincerely ,
:>:>:
:>:>:Joshua D. Drake
:>:>:
:>:>:
:>:>:
:>:>:>Thx,
:>:>:>
:>:>:>Zeb
:>:>:>
:>:>:>
:>:>:>--
:>:>:>DEBUG: statistics collector process (pid 2523) exited with exit code 1
:>:>:>PGSTAT: Error closing temp stats file
:>:>:>PGSTAT: /usr/local/G101/App/DB/./global/pgstat.tmp.7823 : No space left on
:>:>:>device
:>:>:>PGSTAT: AbDEBUG: statistics collector process (pid 2979) exited with exit
:>:>:>code
:>:>:>1
:>:>:>FATAL 2: write of clog file 43, offset 188416 failed: No space left on
:>:>:>device
:>:>:>DEBUG: server process (pid 3741) exited with exit code 2
:>:>:>DEBUG: terminating any other active server processes
:>:>:>NOTICE: Message from PostgreSQL backend:
:>:>:> The Postmaster has informed me that some other backend
:>:>:> died abnormally and possibly corrupted shared memory.
:>:>:> I have rolled back the current transaction and am
:>:>:> going to terminate your database system connection and exit.
:>:>:> Please reconnect to the database system and repeat your query.
:>:>:>NOTICE: Message from PostgreSQL backend:
:>:>:> The Postmaster has informed me that some other backend
:>:>:> died abnormally and possibly corrupted shared memory.
:>:>:> I have rolled back the current transaction and am
:>:>:> going to terminate your database system connection and exit.
:>:>:> Please reconnect to the database system and repeat your query.
:>:>:>NOTICE: Message from PostgreSQL backend:
:>:>:> The Postmaster has informed me that some other backend
:>:>:> died abnormally and possibly corrupted shared memory.
:>:>:> I have rolled back the current transaction and am
:>:>:> going to terminate your database system connection and exit.
:>:>:> Please reconnect to the database system and repeat your query.
:>:>:>DEBUG: all server processes terminated; reinitializing shared memory and
:>:>:>semaph
:>:>:>ores
:>:>:>DEBUG: database system was interrupted at 2004-01-09 05:22:52 EST
:>:>:>DEBUG: checkpoint record is at 0/138CFD4
:>:>:>DEBUG: redo record is at 0/138CFD4; undo record is at 0/0; shutdown FALSE
:>:>:>DEBUG: next transaction id: 45811837; next oid: 65205
:>:>:>DEBUG: database system was not properly shut down; automatic recovery in
:>:>:>progre
:>:>:>ss
:>:>:>DEBUG: redo starts at 0/138D014
:>:>:>FATAL 2: write of clog file 43, offset 188416 failed: No space left on
:>:>:>device
:>:>:>DEBUG: startup process (pid 3785) exited with exit code 2
:>:>:>DEBUG: aborting startup due to startup process failure
:>:>:>
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:>:>:>
:>:>:> http://archives.postgresql.org
:>:>:>
:>:>:>
:>:>:
:>:>:
:>:>:
:>:>
:>:>
:>:
:>:
:>:
:>
:>
:>
:
:
:

--
Aurangzeb M. Agha | Email : am*@mltp.com
| Home : +1 413 586.4863
| Pager : +1 413 785.7568
| : 41********@myai rmail.com
73 Bridge St. #15 | Mobile: <coming soon>
Northampton, MA 01060 | e-Fax : +1 978 246.0770
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Nov 12 '05 #17
"scott.marl owe" <sc***********@ ihs.com> writes:
[postgres - DB]$ df -m .
Filesystem 1M-blocks Used Available Use% Mounted on
- 63328 55308 4803 93% /
Do you have root access to it? if so, set the reserved space for root to
be 0%, and then try vacuuming. Vacuuming requires some free space, and
since you're pretty much out, it isn't gonna be able to complete.


Look again --- it's showing free space in MB not KB. He's got 4.8GB
free. (Although that might be free-from-root's-point-of-view, rather
than what an unprivileged user can use ...)

regards, tom lane

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Nov 12 '05 #18
On Fri, 9 Jan 2004, Aurangzeb M. Agha wrote:
DEBUG: statistics collector process (pid 2523) exited with exit code 1
PGSTAT: Error closing temp stats file
PGSTAT: /usr/local/G101/App/DB/./global/pgstat.tmp.7823 : No space left on
device


To me it does not sound strange that the database is growing when the stat
collector updates the tables with statistics. And since there are updates
it would have been good to have vacuumed avery once in a while.

I don't know the internals of pg as well as some of the other people who
have answered, but as far as I know the stat collector is not special in
any way but is updating the stat tables.

--
/Dennis Björklund
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Nov 12 '05 #19
"Aurangzeb M. Agha" <am******@mltp. com> writes:
Re inodes, how can I check this?
"df -i" should help.
But why would this be? Is Postgres
sucking up inodes just sitting there as a read-only DB?


I think you have missed the point here. Postgres is using 0.1 percent
of your disk; whatever is eating disk space or inodes is somewhere in
the 92.9% of the disk that you have not told us about. You are focusing
on killing the messenger instead of finding the true source of the
problem.

You should also check into the per-user-quota possibility.

regards, tom lane

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Nov 12 '05 #20

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