Re: Question about Exchange Logs and DB's Best Practice

From: Neil Hobson [MVP] (neil.hobson_at_nospam.silversands.co.uk)
Date: 07/01/04 

Date: Thu, 1 Jul 2004 17:43:51 +0100

Absolute best practise, in my opinion, would be to have all logs (per SG)
and databases on their own RAID sets. However, in reality that is not
always possible and therefore the next best thing is to have each SG's logs
on their own RAID arrays with the databases on another single RAID array.

The key really is to keep the logs separate from the databases and separate
from themselves too.

Technically you put all of them on the same drive, but performance will
suffer (the degree of which depends on many factors such as number of users,
how much mail they send, speed of disks, etc). Exchange is I/O intensive,
so don't skimp on the disk subsystem. :-) 

-- 
Neil Hobson
Exchange MVP
For Exchange news, links and tips, check:
http://www.msexchangeblog.com
"Megan Kielman" <megan.kielman@(removethis)weyerhaeuser.com> wrote in
message news:eNFF5e4XEHA.2672@tk2msftngp13.phx.gbl...
> Is it best practice to have each Exchange Server SG Log on its own
mirrored
> set and each MB Store Database on its own Raid 5 or can you put all Logs
on
> the same Drive and all Databases on the same drive?
>
> Thanks!
>
>

Relevant Pages

  • Re: Splitting our Exchange 2003 Ent Database
    ... You need to have the logs on ... an isolated set of spindles. ... RAID 5 performance is very assymetrical favoring reads over write by 4:1. ... RAID 5 for the databases. ...
    (microsoft.public.exchange.admin)
  • Re: Splitting our Exchange 2003 Ent Database
    ... You need to have the logs on ... an isolated set of spindles. ... RAID 5 performance is very assymetrical favoring reads over write by 4:1. ... RAID 5 for the databases. ...
    (microsoft.public.exchange.admin)
  • Re: Unlikely performance issues
    ... raid 5 is very fast with read operations. ... drives and separate RAID 10 drives for databases and logs. ... An ideal disk layout would be mirrored system ...
    (microsoft.public.exchange.admin)
  • Re: Measuring IOPS and Raid penalty
    ... RAID 1 2 drives SG1 Logs ... RAID 10 4 drives SG1 Databases ...
    (microsoft.public.exchange.admin)
  • Re: Measuring IOPS and Raid penalty
    ... Why 3 storage groups and 6 databases? ... reason for this is that log bufferes are allocated on a per storage group ... RAID 10 4 drives SG1 Databases ... Megacycles per mailbox and IOPS per mailbox change ...
    (microsoft.public.exchange.admin)
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