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Oo.et.oO
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Joined: 23 Apr 2002
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Location: burlington
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 Posted: Fri Mar 23, 2012 3:11 pm Post subject: how do i change the location of /var/log? (solved) |
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i'm trying to move it to reduce writes to my sda SSD.
i have a raid array on this machine. i tried moving it there using a symbolic link.
upon reboot openRC says it can't recreate /var/log as the file already exists.
difficult to search on this. any ideas?
Last edited by Oo.et.oO on Fri Mar 23, 2012 9:36 pm; edited 1 time in total |
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papahuhn
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| Posted: Fri Mar 23, 2012 3:59 pm Post subject: |
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"mount /path/to/RAID/folder --bind /var/log" or the corresponding fstab entry.
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Oo.et.oO
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| Posted: Fri Mar 23, 2012 4:23 pm Post subject: |
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thanks for the reply papahuhn. let me be more detailed.
i want /var/log IN the raid array. it's 6TB. i don't need a 6TB /var/log 
prior, i tried just symlinking /var/log to /mnt/raid/var-log
(simplified, mine had an rsync in there to copy everything over):
| Code: | | cd /var && mv log log.old && ln -s /mnt/raid/var-log /var/log |
good tip on --bind |
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papahuhn
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| Posted: Fri Mar 23, 2012 7:07 pm Post subject: |
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| Oo.et.oO wrote: | thanks for the reply papahuhn. let me be more detailed.
i want /var/log IN the raid array. it's 6TB. i don't need a 6TB /var/log
prior, i tried just symlinking /var/log to /mnt/raid/var-log
(simplified, mine had an rsync in there to copy everything over):
| Code: | | cd /var && mv log log.old && ln -s /mnt/raid/var-log /var/log |
good tip on --bind |
Then bind to /mnt/raid/var-log.
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Oo.et.oO
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| Posted: Fri Mar 23, 2012 7:10 pm Post subject: |
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| papahuhn wrote: |
Then bind to /mnt/raid/var-log. |
doesn't this just make it so they are mounted in the same place? like a mirror? thus i'm writing to both drives now:
| Code: | | mount -o bind /var /mnt/tmp/other_var/ |
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papahuhn
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| Posted: Fri Mar 23, 2012 7:26 pm Post subject: |
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You can see it as some mirror if you like. Why don't you play with it a little? "mount /mnt/raid/var-log --bind /var/log" is pretty much what you want.
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Oo.et.oO
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| Posted: Fri Mar 23, 2012 7:40 pm Post subject: |
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okay, so i was thinking about it backwards, but it still doesn't work. or at least it appears, not entirely
| Code: | glazed var # rsync -a /var/ /mnt/tmp/other_var/ && mount /mnt/tmp/other_var/ --bind /var/
glazed var # lsof /dev/sda3 | awk '$4 ~ /(FD|[wWuU]$)/'
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
agnLogd 1931 root 0w REG 8,3 681 157248 /var/log/agns/agnLog.txt
agnLogd 1931 root 1u FIFO 8,3 0t0 157403 /var/agns/fifo/agnLogd
metalog 1968 root 8w REG 8,3 367844 132630 /var/log/everything/current
...
glazed var # lsof /dev/sdb1 | awk '$4 ~ /(FD|[wWuU]$)/'
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
smbd 2179 root 2w REG 8,17 20949 117310278 /var/log/samba/log.smbd
smbd 2179 root 8w REG 8,17 20949 117310278 /var/log/samba/log.smbd
...
glazed / # mount
...
/mnt/tmp/other_var on /var type none (rw,bind)
glazed var # touch yourmom
glazed var # ls
agns/ db/ lib/ log/ run/ tmp/ yourmom
cache/ empty/ lock/ mail@ spool/ www/
glazed / # ls /mnt/tmp/other_var/
agns/ cache/ db/ empty/ lib/ lock/ log/ mail@ run/ spool/ tmp/ www/
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sda3 is /
sdb1 is /mnt/tmp
not sure what's going on here exactly. but now since samba has taken to writing its logs there, i can't unmount it. and some files just don't get written to both places.
Last edited by Oo.et.oO on Fri Mar 23, 2012 8:03 pm; edited 1 time in total |
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Etal
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| Posted: Fri Mar 23, 2012 7:47 pm Post subject: |
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Some applications are probably still holding their open file handle to the old drive. Either restart those applications or reboot (of course you'd need to add the bind entry to fstab).
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Oo.et.oO
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| Posted: Fri Mar 23, 2012 7:55 pm Post subject: |
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| Etal wrote: | | Some applications are probably still holding their open file handle to the old drive. Either restart those applications or reboot (of course you'd need to add the bind entry to fstab). |
that's what i'm thinking. so they can still access files i can't see from the shell because they have the inodes?
crazy compooters...  |
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papahuhn
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| Posted: Fri Mar 23, 2012 8:00 pm Post subject: |
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The files in the real /var folder are still there, the --bind is just mounted above of it. However I'm confused that you see yourmom in one folder and not the other. Is it "other_var" or "glazed_var"? I see both folder names.
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Oo.et.oO
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| Posted: Fri Mar 23, 2012 8:04 pm Post subject: |
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| papahuhn wrote: | | The files in the real /var folder are still there, the --bind is just mounted above of it. However I'm confused that you see yourmom in one folder and not the other. Is it "other_var" or "glazed_var"? I see both folder names. |
yeah, sorry. it was other_var and then i switched names during part of my session i didn't paste.
yeah, i buy the inodes being able to see under the mount point. but the yourmom thing puzzles me.
[edit]. OH. i did that all while the shell was sitting in /var (under the mount point)
so i mounted on top of where i was (cwd).
when i touched the file in /var i was actually in the original, not in the bound mount.
when i cd / then cd /var and touch a file, it shows up in both places.
i setup my fstab, so i'm about to reboot....
thanks all! |
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Oo.et.oO
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Joined: 23 Apr 2002
Posts: 287
Location: burlington
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| Posted: Fri Mar 23, 2012 9:35 pm Post subject: |
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it works! in retrospect it all seems so obvious.
it took me weeks to figure out where all the writes to my main hard drive were coming from...
now it looks like most of the repeated writes are coming from beagle and on the user level from/into .mozilla and .pulse.
i'll add details on this to the SSD wiki page.
thanks again all!
for posterity here is my applicable portions of fstab:
| Code: |
# raid array
/dev/md127 /mnt/raid ext4 noatime,user_xattr 0 2
# move var to magnetic disk...
/mnt/raid/glazed_var /var none defaults,bind 0 0
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