Sync or Soft Updates or gjournal
DWassman at davismonk.com
Sat Mar 15 13:08:28 UTC 2008
Thanks for the response. I like gmirror and actually use it for two
production machines but in this case, I think I still prefer to use the
hardware RAID5 (for online expansion and rebuilds) and I always prefer
to use SAS/SCSI if given a choice. Anyways, the hardware is already
So gjournal will slow it down. It is hard to believe all the hype of
journalled filesystems is all about not having to fsck on boot. (Yes I
know it is fsck not fschk (other post). Been working with M$ too much).
Does anyone know why Michael Lucas would say "up to 80GB" for soft
updates? I start FreeBSD with Absolute BSD and Scary Daemons and has
always found his advice solid and reliable. I hate to go against it here
and be wrong. Especially, when this is a large project with the fate of
FreeBSD being used in the environment here at stake.
David Wassman, MCP Net+
IT Network Administrator
Davis, Monk & Company
(352) 375-1583 FAX
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> My question is with this setup (Have not assembled or installed yet),
> for a fileserver running Samba to share in mixed environment, what
> be better, sync, soft updates or gjournal. From my understanding, sync
first - for the same amount of money, use cheaper and larger SATA disks,
no special controller and RAID1 (gmirror), not RAID5.
while RAID1 "wastes" half space, with large IDE drives you still get
space, while SATA drives are slightly slower, you still get FASTER
on writes because RAID5 is bad for this, and on reads. gain on not using
RAID5 will outperform slower drives.
> is the most secure as far as data integrity but suffers from
> performance. Soft Updates is a mix between the two but from reading
soft updates isn't the mix of two - it's much better. you actually get
sync integrity with almost async performance, but with larger CPU
usage, which - with modern CPUs - is minimal anyway.
just use them :)
gjournal will actually slow things down, for avoiding fsck on boot.
properly configured freebsd doesn't crash every day so spending an hour
(at most) on fsck doesn't make a problem.
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