Re: Hardware for 1000+ people
- From: "Mick" <mick377_1[remove]@hotmail.com>
- Date: Fri, 20 May 2005 11:37:27 +1000
Speaking to my Dell representative they advise that the bus can be split in
the 2850 giving each RAID-1 set its own channel. For the RAID 0+1 located in
the storage chasis their advice is to have all 9 disks on one channel.
Splitting the RAID 0+1 into two and putting each on its own channel would
not make a measurable improvement in their opinion, I'd also need a standby
disk on each channel and it would decrease my expansion capabilities.
I now can see my manager asking why I need a server with 13 disks in it ;-)
"Mick" <mick377_1[remove]@hotmail.com> wrote in message
news:kGaie.8$j74.613@xxxxxxxxxxxxxxxxxxxxxxx
> Looking to move from Ex2K to Ex2K3 on new hardware.
>
> I currently have over 1000 mailboxes on Ex2K, database currently around
45GB
> in one storage group, another 5GB in public folders. OS = RAID 1, DB +
Logs
> = RAID 5 (5 x 10Ks). Originally the 5 disks were setup as 2 for Logs and 3
> for DB, but as the DB grew there was no choice but to increase the RAID 5
to
> 5 disks as funding wasn't available. I mention this as the server runs
> poorly when our users decide to send 25MB+ emails around.
>
> To improve performance and allow for growth I am proposing the following
:-
>
> Dell 2850 - 2 x 3G XEON, 4G RAM
> OS = 2 x 36G 15K (RAID 1)
> LOGS = 2 x 36G 15K (RAID 1) (Logs are currently only a few GB per day)
>
> PowerVault
> DB = 9 x 72G 15K (RAID 0+1) (9th disk as standby)
>
> The MS documentation seems to steer away from RAID 5 due to write
penalties
> (eg below link)
>
>
http://www.microsoft.com/technet/prodtechnol/exchange/guides/StoragePerformance/049faa66-321e-433f-8df8-083e52e7ae5e.mspx
>
> I've also had a look at HPs sizing tool.
>
> As part of the migration I intend to introduce at least a second storage
> group keep each one below 30GB.
>
> Interested in anyones views on the suitability of this new hardware. One
> area I'm yet to finalise is the controllers and channels. I'm assuming
that
> I can use two channels on the internal controller on the 2850, one for OS
> disks, two for Log disks), and I can install an additional PERC controller
> for the RAID 0+1 array. For the 0+1 array should all the 9 disks be one
one
> channel, or should each side of the mirror be on its own channel ?
>
> Thanks for your time.
>
>
>
.
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- Hardware for 1000+ people
- From: Mick
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