Re: major lost of performance after moving Bacula Server from Solaris to linux for Solaris clients only

On 4/29/26 11:05, Andrew Watkins wrote:
>
> Arno,
>
> Well I finally spotted the difference between the new and old systems.
>
> I said the old server was doing compression, but IT WAS NOT! So, as 
> soon as I switch off compression on the new server I get better 
> performance.
>
>    Rate:                   84648.1 KB/s
>    Software Compression:   None
>    Comm Line Compression:  13.4% 1.2:1
>
> I didn't spot it since the configuration files are the same and I used 
> the same build setup on both platforms. For some reason the old 
> Solaris server didn't set the compression on any client (clients have 
> not been altered, except for passwords!). I don't see why since libz 
> is available.
>
> So, I have good speeds now with NO compression, but I will look into 
> later why GZIP (haven't tested LZO yet) really hits performance 
> (Solaris client CPU is 95% idle during backup, so not a CPU problem.)
>

Gzip in Bacula is single-threaded and operates on quite small block 
sizes. Look for a single core being slammed, even though the overall CPU 
utilization for all cores might be low. If compression is needed to 
decrease storage needs, then put the backup volumes on ZFS (or for tape 
just use the tape drive's hardware compression) and leave Bacula 
compression off.


> Anyway, for now thanks,
>
> Andrew
>
> On 4/23/2026 3:25 PM, Arno Lehmann via Bacula-users wrote:
>> Hi Andrew,
>>
>> just a very quick suggestion for now -- you could try disabling 
>> transport encryption and compression and see if you get better 
>> throughput.
>>
>> And one question about the change: Have you touched the client on the 
>> Solaris host or the configuration (beyond changing credentials for 
>> the DIR)?
>>
>> The reason I ask is that, as far as I recall, the openSSL and 
>> possibly compression libraries on Solaris may be just slow compared 
>> to other platforms.
>>
>> 'status client=<the-solaris-host-fd>' should give a bit of 
>> information about the client build in the header, and that may become 
>> interesting when we try to find out if the FD is potentially 
>> problematic.
>>
>> Cheers,
>>
>> Arno
>>
>> Am 23.04.2026 um 13:28 schrieb Andrew Watkins:
>>> Hello,
>>>
>>> Have a strange one here. I have moved to a new Bacula Server and the 
>>> read performance for a Solaris client is 3 times as bad.
>>>
>>> All other clients (Windows, Linux) are good.
>>>
>>> Old setup:
>>>
>>> Solaris Bacula 13.04 Server (slow disks for spooling) LTO5 when 
>>> backing up a Solaris file server I get:
>>>
>>>      iostat gives me about 100Ms
>>>      Bacula Backup report gives me ~ 54,664.4 KB/s
>>>
>>> New Setup:
>>>
>>> Ubuntu Bacula 13.04 Server (Fast disks for spooling) LTO9 when 
>>> backup up save Solaris file server I get:
>>>
>>> iostat gives me about 30Ms
>>> Bacula Backup report gives me ~4,661.3 KB/s
>>>
>>> But other clients Windows & linux are report good rates.
>>>
>>> The conf files are near enough the same, so any ideas why Solaris is 
>>> so slow when backup up to a Linux server?
>>>
>>> Thanks,
>>>
>>> Andrew
>>>
>>> -- 
>>> *****************************************************
>>> *****    Support Request [email protected] *****
>>> *****************************************************
>>> * Andrew Watkins                                    *
>>> * Birkbeck, University of London                    *
>>> * Computing and Mathematical Sciences               *
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>>> *
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>>
> -- 
> *****************************************************
> *****    Support Request [email protected]    *****
> *****************************************************
> * Andrew Watkins                                    *
> * Birkbeck, University of London                    *
> * Computing and Mathematical Sciences               *
> *http://notallmicrosoft.blogspot.com               *
> *****************************************************
>
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