Hi,
That's right, don't use any Maximum Volume Bytes. All my LTO-7 tapes are
a bit different, sometimes it backupe's 6T, sometimes 8.5T.
If you need some config files, let me know.
Regards,
Birgit
On 25/12/20 19:57, 'Frank Cherry' via bareos-users wrote:
Thanks for the information, I will play with some test backups and see,
also install sg_utils and check.
Thanks a lot, Frank
[email protected] schrieb am Freitag, 25. Dezember 2020 um
19:18:08 UTC+1:
Found the command it’s
sg_logs -a <device>
sg_logs -a /dev/sg5
<lots of data>
Data compression page (LTO-5 specific) [0x32]
Read compression ratio x100: 109
Write compression ratio x100: 100
You can see I’m not compressing at all because I’m doing client side
compression (backing up over home networks)
You can also compare the bareos volume size to
Tape capacity page (LTO-5 and LTO-6 specific) [0x31]
Main partition remaining capacity (in MiB): 46592
Alternate partition remaining capacity (in MiB): 0
Main partition maximum capacity (in MiB): 800226
Alternate partition maximum capacity (in MiB): 0
Which is the native capacity, if your volume is larger than your
actual consumed your compression is working.
Brock Palen
[email protected]
www.mlds-networks.com <http://www.mlds-networks.com>
Websites, Linux, Hosting, Joomla, Consulting
> On Dec 25, 2020, at 12:58 PM, Brock Palen
<[email protected]> wrote:
>
> Also compression look up the mt commands. But most are on by
default. Only encryption is anything you need to mess with in
bareos. Again if doing client compression you won’t see much if any
on the tape side. If your not you should see it.
>
> You can verify how much compression your getting two ways. One is
the volume size bareos reports being larger than the 6T native size.
>
> The other is look at the sg_* commands. One will read ann the
drive and currently loaded tape data. One will tell you compression
ratio read / written for the tape.
>
> Sent from my iPhone
> Brock Palen
> 989-277-6075 <tel:(989)%20277-6075>
>
>> On Dec 25, 2020, at 12:53 PM, Brock Palen
<[email protected]> wrote:
>>
>> I wouldn’t bother. Modern LTO drives (any made in lay 10 years)
auto detect end of volume. I do t use this setting at all with my
two drives and it auto sorts it out.
>>
>> This is important because the 15T quoted assumes compression of
a given ratio. That can very drastically. If you use client side
compression you won’t see any compression at all. Similar if most
your data are video and doesn’t compress well. If it’s all text
emails you will get more than listed.
>>
>> Let the drive auto detect and it will work the best. I think
this is one of the things you can test with the btape command.
Highly recommend you run all the tests in btape abd make sure they
pass.
>>
>> I only use max volume size with disk volumes.
>>
>> Sent from my iPhone
>> Brock Palen
>> 989-277-6075 <tel:(989)%20277-6075>
>>
>>> On Dec 25, 2020, at 12:38 PM, 'Frank Cherry' via bareos-users
<[email protected]> wrote:
>>>
>>>
>>> Hello there,
>>>
>>> I'm storing on Ultrium 7 LTO tapes with a single drive unit.
>>> It is right, to set in the pool config the
>>>
>>> Maximum Volume Bytes = 15000G # Limit Volume size to something
reasonable
>>>
>>> to 15000G ? The tape is specified with 6 / 15 TB (uncompressed
/ compressed)
>>>
>>> Is the tape drive works as default with compression? How can I
check it and can I define it on the SD config?
>>>
>>> Thanks, Frank
>>>
>>> --
>>> You received this message because you are subscribed to the
Google Groups "bareos-users" group.
>>> To unsubscribe from this group and stop receiving emails from
it, send an email to [email protected].
>>> To view this discussion on the web visit
https://groups.google.com/d/msgid/bareos-users/f7fef681-396f-47dc-8a76-6a28547e7caan%40googlegroups.com
<https://groups.google.com/d/msgid/bareos-users/f7fef681-396f-47dc-8a76-6a28547e7caan%40googlegroups.com>.
--
You received this message because you are subscribed to the Google
Groups "bareos-users" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to [email protected]
<mailto:[email protected]>.
To view this discussion on the web visit
https://groups.google.com/d/msgid/bareos-users/22f744b7-dd1e-43ba-850e-cb4c287d81c7n%40googlegroups.com
<https://groups.google.com/d/msgid/bareos-users/22f744b7-dd1e-43ba-850e-cb4c287d81c7n%40googlegroups.com?utm_medium=email&utm_source=footer>.
--
You received this message because you are subscribed to the Google Groups
"bareos-users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/bareos-users/f787190d-ca33-bc67-cce4-c36fbece2637%40unifr.ch.
