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Data Domain space.log content
I was looking at Data Domain space usage and took also look at space.log file. Admin guide says something about SPACE_HEADER and SPACE keywords in beginning of line, but there is also bunch of lines beginning with SPACE_MT_ . For example:
SPACE_MT_4e9ea73c, 2015/11/17 08:55:02, 1447743302, vbytes=232503330620224, pre=1837820848434087, uniq=93829932152822, post=72354650149281, cdel=1518490121210872, tier=1
SPACE_MT_4e9ea73c, 2015/11/17 08:55:02, 1447743302, vbytes=0, pre=0, uniq=0, post=0, cdel=0, tier=2
I guess they display some info about mtree's but what info and how I can figure out what is related to what mtree?
ble1
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November 18th, 2015 04:00
Isn't easier just to use mtree show comp ?
sasilik
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November 18th, 2015 22:00
I though that maybe they are same but I have script which collects some data with mtree show compression and if I look numbers which space.log shows and data which is collected 5 minutes afterward with script then I can't find same numbers. For example I have one small not used mtree. mtree show comp taken 5 minutes after space.log info shows following:
Total files: 148; bytes/storage_used: 1.0
Original Bytes: 255,333,877
Globally Compressed: 254,480,458
Locally Compressed: 258,396,292
Meta-data: 878,372
And I can't find nowhere in space.log such numbers. That is why I wondered what these numbers are.
sasilik
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November 20th, 2015 00:00
I guess I am not going to rack my brains with it any more. Maybe someone gives some official answer sometime but for now I can only assume what these numbers are.
I took a look at my largest mtree's show compression numbers and SPACE_MT... numbers and made bytes to TeraBytes. vbytes numbers were quite same with my 3 largest mtree "Original bytes". In TeraBytes they were same. So I guess vbytes are same as "Original bytes". But others are maybe total sums of all data written, deduplicated and deleted on mtree. Because as Original bytes were 191TB, pre was 1673TB, uniq 85TB, post 66TB and cdel 1403TB