Rick,
Thank you for the valuable explanation. With this information, I'm planning to wait until the end of the day and that'll give it plenty of time to rebuild.
I appreciate your help and for sending that link!
Julie Lehmann
Mercury Minnesota Inc.
Thank you for the valuable explanation. With this information, I'm planning to wait until the end of the day and that'll give it plenty of time to rebuild.
I appreciate your help and for sending that link!
Julie Lehmann
Mercury Minnesota Inc.
----- Original Message -----
From: that_guyy
To: vantage@yahoogroups.com
Sent: Friday, August 10, 2012 12:09 PM
Subject: [Vantage] Re: OT - Hot swappable Disk
Julie,
Jose is right, it is very safe to swap out Hot Swap hard drives in RAID. However, keep in mind what is going on:
-The drive failed and the RAID controller detected this by depreciating the disk from the RAID set and changing how data is written to the RAID Array. This happens when a disk either fails or is removed while still good.
-When the failed or missing drive is replaced the RAID array goes to work at rebuilding the array to cover all available disks. Until the array rebuild is complete the array is under heavier load, so the DB may not perform as fast as it does when operating normally. Also the array is not instantly back to normal when the disk is replaced, depending on the array configuration and size it can take several hours to restore to normal, during this time I would not remove any other disks as it will extend the time it takes to recover the array.
So while it IS safe for the hardware to remove hot-swap disks at will, it may not be safe for the data nor the performance of your system.
So if you replace a bad disk and then 5min later either another disk fails or is removed, the Array will again switch how data is stored and depending on the array data may or may not be lost. How many disk failures that can occur in an array are based on a normal, stable array, not one in transition.
Here is a good read for RAID 5, if you are using RAID 5, we are using RAID 50 some hybrid which can handle multiple disk failures at once without data loss:
http://www.cyberciti.biz/faq/what-happens-when-hard-disk-fails-in-raid-5/
-Rick Bird
IT Software Administrator
Rowmark, LLC.
--- In vantage@yahoogroups.com, "Julie Lehmann" <jlehmann@...> wrote:
>
> Thanks Jose,
> That's what I needed to hear. :-)
> (Maybe after being successful this first time - I'll try it just for fun
> another time!)
>
> Julie Lehmann
>
>
> ----- Original Message -----
> From: "Jose Gomez" <jose@...>
> To: <vantage@yahoogroups.com>
> Sent: Friday, August 10, 2012 11:38 AM
> Subject: Re: [Vantage] OT - Hot swappable Disk
>
>
> > We do it just for fun all the time, if you have RAID 10 and more than 3 or
> > 4 disks it should be safe. Make a backup of your DB (external to this
> > server) and then do it
> >
> >
> > *Jose C Gomez*
> > *Software Engineer*
> > *
> > *
> > *
> > *T: 904.469.1524 mobile
> > E: jose@...
> > http://www.josecgomez.com
> > <http://www.linkedin.com/in/josecgomez>
> > <http://www.facebook.com/josegomez>
> > <http://www.google.com/profiles/jose.gomez>
> > <http://www.twitter.com/joc85>
> > <http://www.josecgomez.com/professional-resume/>
> > <http://www.josecgomez.com/feed/>
> > <http://www.usdoingstuff.com>
> >
> > *Quis custodiet ipsos custodes?*
> >
> >
> >
> > On Fri, Aug 10, 2012 at 12:28 PM, Julie Lehmann
> > <jlehmann@...>wrote:
> >
> >> **
> >>
> >>
> >> Hi group,
> >> I have a hard drive that failed on my server and I have a replacement for
> >> it. It's hot-swappable, but could someone tell me - is it really safe to
> >> just take the old one out and
> >> put in the replacement without shutting it down? Should I at least stop
> >> the database? I'm nervous about having something go wrong, so any advise
> >> or
> >> assurance would
> >> be appreciated!
> >>
> >> Thanks,
> >> Julie Lehmann
> >> Mercury Minnesota Inc.
> >> Vantage 6.1
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >>
> >>
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
> > ------------------------------------
> >
> > Useful links for the Yahoo!Groups Vantage Board are: ( Note: You must
> > have already linked your email address to a yahoo id to enable access. )
> > (1) To access the Files Section of our Yahoo!Group for Report Builder and
> > Crystal Reports and other 'goodies', please goto:
> > http://groups.yahoo.com/group/vantage/files/.
> > (2) To search through old msg's goto:
> > http://groups.yahoo.com/group/vantage/messages
> > (3) To view links to Vendors that provide Vantage services goto:
> > http://groups.yahoo.com/group/vantage/linksYahoo! Groups Links
> >
> >
> >
> >
>
[Non-text portions of this message have been removed]