Re: RAID syncronization - How often?
- From: "Adam Hannemann" <AdamHannemann@xxxxxxxxxxxxxxxxxxxxxxxxx>
- Date: Mon, 11 Jul 2005 01:42:14 -0700
As I was reading the Promise Array docs I came across this:
Synchronization is a periodic maintenance procedure for Mirroring (RAID 1,
0+1, 3, and 5) arrays to maintain data consistency on all mirrored drives. In
operation, array synchronization compares data on the mirrored drives for any
differences. If there are differences detected, data from the primary
drive(s) is automatically copied to the secondary drive(s). This assures that
all mirrored drives will contain the exact information.
Seemed logical, the server is still active and functions 'normal', and why
not do a sync just in case something is out of whack? RAID 1 only really
syncs when you are doing data transfers back and forth. It doesn't check to
see if the existing data is all synched up. Over time I would expect a
magnetic drive to possibly lose a little consistency and I'd like to have a
process run to make sure it is consistent.
Overkill? Possibly, but I'd rather be safe than sorry.
------------------
Adam Hannemann
ASH Consulting
------------------
"Russ Grover" wrote:
> Adam,
> I'm Confused?
> Why are you Syncing Something that is already Synced?
> (as you know Raid 1 drives are 100% mirrored with in milli seconds of each
> other.)
> If it wasn't syncing you'd get Drive Errors from the server.
>
> I've never heard of doing this please let me know who recommends this?
>
> Thanks
> --
> Russ Grover
> Small Business IT Support
> Portland\Beaverton OR USA
> Email: Sales at SmallBusinessITSupport.com
> Website: www.SmallBusinessITSupport.com
>
>
> "Adam Hannemann" <AdamHannemann@xxxxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> news:4A3BFA29-D610-4E8A-84A3-B9B4224138A6@xxxxxxxxxxxxxxxx
> >I have a couple of servers that use RAID 1 and I have them set to sync once
> >a
> > week. It's set to run on Sunday afternoon when my clients won't be in the
> > office. It's not a terribly intensive process, and my feeling is that
> > once a
> > week is probably plenty.
> >
> > I would say that at least once a month would be a good practise to be in
> > even if you don't really 'need' to do it.
> >
> > What you really need to do is setup the email notifications that Dirk
> > mentioned - that way if there is a problem you'll be notified. That's
> > saved
> > my bacon a couple of times. It's much better to get in and be on top of a
> > problem than come in 5 minutes too late.
> >
> > "Dirk-Thomas Brown" wrote:
> >
> >> I never set it to sync. This I use only if I have an issue and that I set
> >> to
> >> send an email. The Syncing you refer to, is on going, the drives are
> >> mirrored (you have set them as such) as such they are always syncing and
> >> as
> >> data is written etc.. it is done exactly the same to both drives, hence
> >> the
> >> failed drive security.
> >>
> >> Dirk-Thomas
> >>
> >> "Jim G" <Jim G@xxxxxxxxxxxxx> wrote in message
> >> news:u0xMUo%23gFHA.2472@xxxxxxxxxxxxxxxxxxxxxxx
> >> > I'm using the Promise Array Management (PAM) software to syncronize my
> >> > RAID
> >> > 1 array each morning. How often should I schedule the syncronization?
> >> > What
> >> > is best practice? The options are daily, weekly, etc.
> >> >
> >> > Jim G.
> >> >
> >> >
> >>
> >>
> >>
>
>
>
.
- References:
- RAID syncronization - How often?
- From: Jim G
- Re: RAID syncronization - How often?
- From: Dirk-Thomas Brown
- Re: RAID syncronization - How often?
- From: Adam Hannemann
- Re: RAID syncronization - How often?
- From: Russ Grover
- RAID syncronization - How often?
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