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тАО02-01-2008 09:01 AM
тАО02-01-2008 09:01 AM
FSCK time
The precise question is if i am doing an fsck each month or after 6 months(180 days ;default fsck duration)how long the sysmtem takes to finish that..is it better to opt for 30 days interms of saving time?
I dont prefer my system to take more than 4 hours (an example)just for doing fsck? I would rather prefer the system doing fsck if i reboot in between the last six months . Could it lesser the time for fsck if performed after six months.
fsck runs sequentially after a reboot and can be run on concorrently on multple FS if perfomred from single user mode manually. is that right?
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тАО02-01-2008 10:51 AM
тАО02-01-2008 10:51 AM
Re: FSCK time
FSCK can be run in a parallel mode. However, if you run it against filesystems on the same disk you can create thrashing and drastically increase the time to FSCK. Check this link for some generic information about FSCK'ing in parallel mode. http://osr600doc.sco.com/en/FS_admin/_Generic_fsck_and_Its_Options.html
I hope this helps.
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тАО02-01-2008 12:11 PM
тАО02-01-2008 12:11 PM
Re: FSCK time
My question is, why you run fsck? Are you using ext2? Would be great if you change to ext3 and disable the check with tune2fs.
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тАО02-01-2008 01:02 PM
тАО02-01-2008 01:02 PM
Re: FSCK time
That being said, if there are any problems, you are looking at hours.
Now, all this being said, unless your machine is forcibly rebooting without syncing harddrives reguarly, you aren't really going to have any issues with your filesystems.
All of my production machines are too mission critical to take a filesystem offline. Doing a quick online test always passes, but isn't terribly thorough.
If you want to stop the long-bootup times after a failure, then do as Ivan says, disable the forced check period.
If you want to avoid big issues, make sure your systems are stable, have proper power supplies, and are shut down cleanly when they were going to be offline.
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тАО02-01-2008 01:35 PM
тАО02-01-2008 01:35 PM
Re: FSCK time
Most of the systems have ext3 . But there are a few which uses both ext2 & ext3.
did u mean when using ext3(journaled filesystems) there is no need of running fsck? journaled filesystems can take care of itself?
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тАО02-01-2008 10:15 PM
тАО02-01-2008 10:15 PM
Re: FSCK time
If the filesystem has gone-to-hell, then nothing you do will fix that.
How often are you getting 'long boot up times' ? Seriously, how often are you rebooting these machines?
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тАО02-02-2008 01:46 PM
тАО02-02-2008 01:46 PM
Re: FSCK time
Full fsck should be run after an I/O error, read only file system problems, ans so on...
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тАО04-14-2008 02:10 AM
тАО04-14-2008 02:10 AM