Hi all, I have RHEL 4.x Linux, DB2UDBv8.2, run the followinf snapshot sql from my windows control center. I am getting results that don't seem correct to me and I would appreciate it if one or two experts can confirm my suspicion and perhaps point out the needed corrections to make:
THE SQL run from control center:
select total_log_available, total_log_used, sec_logs_allocated,sec_log_used_top,
int(total_log_used/1024/1024) as "Log Used (Meg)",
int(total_log_available/1024/1024) as "Log Space Free (Meg)",
int((float(total_log_used) / float(total_log_used+total_log_available))*100) as "Pct Used",
int(tot_log_used_top/1024/1024) as "Max Log Used (Meg)",
int(sec_log_used_top/1024/1024) as "Max Sec. Used (Meg)",
int(sec_logs_allocated) as "Secondaries"
TOTAL_LOG_AVAILABLE TOTAL_LOG_USED Log Used (Meg) Log Space Free (Meg)
2609024909 2175091 2 2488
Pct Used Max Log Used (Meg) Max Sec. Used (Meg) Secondaries
0 (WHY 0 ??) 85 0 0
1 record(s) selected
And here's a linux df -h disk usage showing the /dmi mount point where the log files are located.
[db2inst1@fsfntudb1 ~]$ df -h
Filesystem Size Used Avail Use% Mounted on
66G 34G 29G 55% /
Size Used Avail Use% Mounted on
/dev/cciss/c0d0p1 97M 41M 52M 45% /boot
none 16G 0 16G 0% /dev/shm
/dev/sda1 493G 370G 98G 80% /ald
/dev/sdb1 99G 18G 76G 19% /ali
/dev/sdc1 99G 93M 94G 1% /alt
/dev/sdd1 493G 242G 227G 52% /bbd
/dev/sde1 394G 224G 150G 60% /bbi
/dev/sdf1 99G 7.8G 86G 9% /bbt
/dev/sdg1 345G 170G 158G 52% /dmd
/dev/sdh1 99G 53G 42G 56% /dmi <<<---------logs
/dev/sdi1 50G 85M 47G 1% /dmt
/dev/sdj1 345G 223G 105G 69% /dwd
/dev/sdk1 99G 11G 84G 11% /dwi
/dev/sdl1 50G 4.0G 43G 9% /dwt
/dev/sdm1 99G 7.3G 87G 8% /stuff
/dev/sdn1 690G 176G 479G 27% /zled
Futhermore, a du command in the /dmi directory shows me this number (in bytes?) ---->>>53088276.
My question is: (1) Does anyone know what formula the linux df -h command uses to compute the above storage space numbers? (2) If I issue a linux du command, the result is in bytes or kilobytes?
(3) Looking at the SQL above, why is the "Pct Used" column zero (0)? Is it a rounding issue and how to solve it with an example?
(4) Why is TOTAL_LOG_USED (217509 meg) so different from du (directory usage 53088276 (in bytes and converted to meg?)).
Can someone please educate me what I am looking at when I see these numbers. They don't add up for me and I need to be able to rely on these numbers.
2) i believe the result is in bytes, but you can issue du -k to get it in kilobytes, du -m for megabytes etc...
3) yes, try to use this
but it won't solve your problem for sure,
if you have big active log files, and when you issue the query you did not have many transactions running, then it is reasonable to get 0 pct_used
4) the numbers you get drom db2 depends on used and free space within db2's log file, so if you have a filesystem of 100GB, but db2's log files are only 100mb in size, total_log_avaiable will not be more than 100mb