hi ya lucas
On Fri, 19 Dec 2003, Lucas Albers wrote:
> What I meant, was if it is a partition size the resync will occur faster
> then if it is a giant partition size.
makes no difference ... "100GB of data to sync" is 100GB of data
no matter how small ..
but if you spread 100GB to 20GB each on 5 disks ..
that will be 1/5 the time to resync the 100GB of data
( the whole point of raid5 )
but it will be say 2x slower to write the 100GB (20GB) of data to 5 disks
> I think I'm just going to put spare backup disk in the system.
usually simpler to use 1 disk for spare.. as long as everythng
fit and you dont have to worry about any config errors
> >> I've found that some volumes just break sync,
> >
...
> I have a raid 5 partiton hde,hdf,hdg,hdh.
> And sometimes hde gets confused and I have to raidhotadd then raidhotadd.
> Happens every couple of weeks, always the same partition that decides to
> go on vacation from the raid set.
sounds like hd3 is a dying disk
- do you have "SMART" turned on it ??
- do you check the cables for it ??? make sure it is ata-100
cables instead of the cheap/fat ata-33 cables
you should NOT have to do that ... raidhotremove/raidhotadd...
> >
> > - in general, i do not recommend raid0 ( stripping ), unless you want:
> > - makes a bunch of smaller disks look like one bigger disk
> > - allows you to read data 2x faster if you "mirror it"
> > ( raid0 across md0 and md1
> > ( where both mdo0 and md1 is a mirror of md0 )
> >
> Good information, to much effort to stripe and mirror, I'll just stay with
> raid1 or raid5.
yup... and lots of hidden problkems with mirror too ...
- erase importantfile.txt and its almost instantly gone from
the mirror ..ooops
> this is what I have used;
> > / 1G
> /boot 100M
> > swap 512MB
> > /opt rest of disk ( aka /home )
>
> Should make seperate /tmp /var partitions on my webserver, thanks for
> reminding me.
/tmp is 100x ( 1000x ) more important than having /boot
> > other partiton schmes
> > http://www.Linux-1U.net/Partitions
> Will take a look at it, too much info...my belly is full.
raiding on top of all that will overflow the full tummy :-0
> Anecdotally I noticed that optimized an athlon or similar 2.4.22 kernels
> on my systems get 14meg, and stock kernels get slower on syncs.
yes... you should see faster performance on tuned kernels ...
and if you wanna tune it more ..
http://www.Linux-1U.net/Tuning
- there's some pretty ( partition & raid ) pics at the bottom too
c ya
alvin
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