Re: [squid-users] To RAID or not to RAID...

> I forgot it is RAID 0 or RAID 1.
>
> However, DISK Stripping does not have redundancy, it is the fastest RAID
> model. Mirroring has redundancy but it has the worst performance.
>
> So, I think you use disk mirroring that allow your system running when 1
> disk goes fail. RAID card will calculate, and handle any disk activity
> including when one of HDD fail.
>
> Thx & rgds,
>
>
> Awie
> ----- Original Message -----
> From: "Yannick Simon" <ysimon@intox.net>
> To: "Awie" <awie@eksadata.com>
> Sent: Monday, June 03, 2002 11:13 PM
> Subject: Re: [squid-users] To RAID or not to RAID...
>
>
> > Hi,
> >
> > Why do you say RAID1 has no redundancy ?
> >
> > i've got a compaq smart array drive... with a RAID1 logical drive where
> one
> > of the two disks is dead
> > however, the computer still works well .. but, it is sais that i have to
> > change the disk ...
> >
> > Am i wrong ? Is the smart card emulating the failed disk with its own
> memory
> > ?
> >
> > Yannick
> >
> > ----- Original Message -----
> > From: "Awie" <awie@eksadata.com>
> > To: "Squid-users" <squid-users@squid-cache.org>
> > Sent: Monday, June 03, 2002 2:03 PM
> > Subject: Re: [squid-users] To RAID or not to RAID...
> >
> >
> > > I have a bit experience about RAID system. Hope this will be
> informative.
> > >
> > > On a serious production machines, I recommend building RAID by using
> RAID
> > > controller such as MYLEX or Compaq SmartArray (in Compaq system and
it's
> > > HDD). Because they have own CPU and (most of them) RAM + Battery
backup.
> > >
> > > Those RAID card will provide tool (in ROM or S/W) to build RAID level
as
> > we
> > > desire, ie. RAID 5. So, you configure the RAID from VERY BEGINNING,
> before
> > > installing ANY OS. After you create logical drive, you will be asked
for
> > > RAID card driver for OS, ie Linux, NT, etc
> > >
> > > Disk stripping (RAID 1 ?) has the highest performance, but no
> redundancy.
> > > And RAID 5 (the most popular) is disk stripping with parity
(redundant).
> > > That is why RAID 5 (as I know) is the most popular. RAM on the RAID
card
> > act
> > > as DISK CACHE that will buffer all of data reading (write through)
> and/or
> > > data writing (write back). It is depend on feature and your setting.
> Write
> > > back mode is very DANGER if RAID card doesn't have Battery backup
> > >
> > > I assume that Squid (that run under Linux, FreeBSD, NT or ANY other
OS)
> is
> > > not directly talk to RAID device. So, it will know the logical drive
> that
> > > you create as NORMAL HDD.
> > >
> > > Anyone, please make corrections if wrong.
> > >
> > > Thx & rgds,
> > >
> > >
> > > Awie
> > > ----- Original Message -----
> > > From: "Henrik Nordstrom" <hno@marasystems.com>
> > > To: "Anthony Giggins" <AGiggins@synergyit.com.au>;
> > > <squid-users@squid-cache.org>
> > > Sent: Monday, June 03, 2002 5:07 PM
> > > Subject: Re: [squid-users] To RAID or not to RAID...
> > >
> > >
> > > > On Monday 03 June 2002 08:31, Anthony Giggins wrote:
> > > > > How does this react when a drive dies and a cached object that is
> > > > > requested was on the dead drive?
> > > >
> > > > Squid will be quite upset until you remove the failed drive from
it's
> > > > configuration.
> > > >
> > > > Exacly how upset is a bit hart to tell as this is an area that isn't
> > > > exacly very widely tested.. there is some provision in Squid for
> > > > dealing with such errors, but no guarantees.
> > > >
> > > > If it worries you, testing is recommended.
> > > >
> > > > Regards
> > > > Henrik
> > >
> > >
>
Received on Mon Jun 03 2002 - 20:08:56 MDT