You might made these changes and see if your better off.
/etc/modprobe.conf
options st buffer_kbs=1024 try_direct_io=1
/etc/bacula/bacula-fd.conf
FileDaemon { # this is me
.....
Maximum Network Buffer Size = 65536
}
/etc/bacula/bacula-sd.conf
Device {
...
Maximum Block Size = 1048576;
Maximum Network Buffer Size = 65536
}
On Fri, 2008-02-22 at 13:14 +0100, Rathinasamy, Bhaskaran (ext) wrote:
> Hello,
>
> Today is my deadline in the project to increase the speed of writing to
> disk. But I failed..... :-(
>
> Iam just asking the same question again, If anybody can give me a lead,
> it will be very helpful.
>
> I will give the complete detail.
>
> SYSTEM : Power edge 2650.
> CPU - 1
> RAM - 4GB.
> OS - SLES 9 SP3.
> Bacula - 2.2.7.
> Tape Drive - SCSI LVD Ultrium LTO 3 Autchanger.
> Database - mysql 4.1
> Controller in host - Mega raid controller (perc3)
> Maximum writing speed with bacula - 7.8 Megabytes/second.
> Maximum Writing speed with vdump and 1024 block size - 32
> Megabytes/second.
> The tape library device - /dev/sg1
> The tape drive - /dev/sg0 ( But we use /dev/nst0 for taking backup )
>
> The Autochanger company claims the following speed of writing.
>
> Data Transfer Rate (native): 80 MBps ( 22.8 GBph )
>
> Data Transfer Rate (compressed): 160 MBps ( 45.5 GBph )
>
> I feel the above is in Megabits/sec? am I correct, please tell me if
> anybody is sure on this. As I get a speed of 7.8 Megabytes / sec with
> compression and without compression.
>
> The whole bacula set up works fine with our environment, like Storage
> daemon,file daemon etc. And the backup process is absolutely fine except
> for the speed.
>
> I have changed the daisy chain scsi cable 3 times. No improvement in
> speed.
>
> I have tried changing the terminator also today. The same speed results.
> The funny thing is I tried without terminator also and everything works
> fine with same speed.
>
> I have tried with enabling spooling ( no raid ). The spooling speed
> differs from 2 Megabytes/sec to 100 Megabytes/sec but the despooling
> speed lies exactly at 7.8 megabytes/second.
>
> The despooling speed is at 7.8 Megabytes/sec for local file system,
> mounted file system(tru 64 filesystem mountes in bacula server ) and any
> file system of bacula client .
>
> Does anyone find anything fishy???? Kindly help...
>
> The config iam using are attached.
>
> Thanks & Regards,
> Bhaskaran
>
>
>
>
> -----Original Message-----
> From: Rathinasamy, Bhaskaran (ext)
> Sent: Wednesday, February 20, 2008 5:19 PM
> To: 'John Drescher'
> Cc: [email protected]
> Subject: RE: [Bacula-users] Increase DeSpooling Speed.
>
> Hello John,
> Many Thanks .
>
> I have tested the raw drive speed with vdump and bs=1024, The drive
> speed is around 35MB/s during vdump.
>
> The tape drive is SCSI LVD.I had tried replacing the cable twice.but no
> improvement in speed through bacula.
>
> Does a spool file on raid0 increases the despooling speed significantly.
> Because my spooling directory is /var/backup and it is not raided and no
> spool size limit is set.
>
> We use a single processor machine with 4 GB memory and the spool folder
> is ext3.
>
> Is your despooling speed with Compression or not? Either software or
> hardware compression?
>
>
>
> Thanks & Regards,
> Bhaskaran
>
> -----Original Message-----
> From: John Drescher [mailto:[EMAIL PROTECTED]
> Sent: Wednesday, February 20, 2008 4:55 PM
> To: Rathinasamy, Bhaskaran (ext)
> Cc: [email protected]
> Subject: Re: [Bacula-users] Increase DeSpooling Speed.
>
> On Feb 20, 2008 10:38 AM, Rathinasamy, Bhaskaran (ext)
> <[EMAIL PROTECTED]> wrote:
> > Hello,
> >
> > We have a LTO-3 Ultrium Tape Library.Bacula 2.2.7 is implemented in
> SLES
> > 9.
> >
> > The despooling speed to the tape is 7.8 MB/sec always, even with
> > hardware compression and no hardware compression.
> >
> Is your tape drive scsi? Possiblty the problem is a scsi problem.
>
> You can test raw drive speeds with dd something like:
>
> time dd if=/dev/sda of=/dev/nst0 bs=1G count=10
>
> If you have hardware compression on do not use /dev/zero because you
> will get a very unrealistic result.
>
> >
> > Is it possible to increase the despooling speed.
> >
> I get despooling speeds of 30 to 45MB/s on a LTO2 autochanger when
> using a 2GB spool file. My spool folder is currently on its own xfs
> filesystem and using software raid0. My bacula-sd machine (different
> machine from the director) is a 2 processor opteron 248 with 4GB of
> memory.
>
> John
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