Re: making more room in root partition for distribution upgrade
On Mon, 21 May 2018 21:48:33 +0200 Pascal Hambourg said:
> Le 21/05/2018 à 21:03, Abdullah Ramazanoğlu a écrit :
> > Forgot to add that in a raid-1 setup swap partition*s* should not be
> > mirrored.
> Of course they should be mirrored in RAID 1 too. Otherwise it defeats
> the purpose of RAID 1.
> > There should be 2 separate non-mirrored swap partitions, one on each drive,
> > for better swap performance (distributed I/O).
> The purpose of RAID 1 is to provide redundancy and availability, not
> What do you think happens to a running system when one half of the swap
> suddenly becomes unavailable after a disk failure ?
I would agree mirroring swap for a mission critical server. Otherwise it would
be an overkill, IMO.
If one of the non-mirrored swaps go down, then I will get a system crash. So?
Estimating once in a 15 years on average I would get a head-crash, this doesn't
justify (1) wasting disk space for mirrored swap, and (2) not taking advantage
of distributed swap I/O.
Though, RAID-1 read logic (of concurrent parallel I/O) partly compensates for
As for the purpose of RAID-1, there is theory and there is practice. It boosts
I/O performance, in addition to the advantages you mentioned.