[DRBD-user] slow sync speed of 12TB over 10GE

Igor Neves igor at 3gnt.net
Mon Jan 12 15:30:19 CET 2009

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Hello,

Yes this is true. The metadata can be the problem, i would just use a
simple raid setup, everything over hardware raid.

Thanks for the clue.

Jürgen Scholz wrote:
> Hello!
>
>> I'm new to the topic but managed to get a mirrored setup working.
>> The only problem is the sync speed:
> After all what Igor has said there is one thing that popped into my mind:
> Maybe you want to put the metadata onto a non-RAID5-disk.
> I remember that Lars mentioned a serious performance degradation if
> the metadata is on a RAID5, because the metadata changes often. With
> hardware RAID this is not as serious qs with software RAID, because
> normally there is a big (and battery backed!!) cache on them.
> The performance degradation seen in synchronisation due to the "slow"
> metadata blockdevice will also strike in regular use. You may want to
> do something about it.
>
> Please correct me if i'm wrong here!
>
> What i would do:
> Use two disks in a RAID1 configuration for the OS and metadata. You
> should be fine then. The only problem is: you'll lose available
> harddisk space.
>
> hth,
>  juergen
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