Re: Question about Exchange Logs and DB's Best Practice
From: Neil Hobson [MVP] (neil.hobson_at_nospam.silversands.co.uk)
Date: 07/02/04
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Date: Fri, 2 Jul 2004 16:10:43 +0100
Yes, even from 5.5 days, the primary reason you separate logs from databases
is performance. Recovery is listed as the secondary reason. To gain the
best performance in Exchange, you must have a dedicated spindle set for each
set of SG logs.
You are right about having all your databases on the same drive - lose it,
and you obviously lose all users. It's all a balancing act with how many
disks you have. If you can split the databases as well, then that's really
good.
-- 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:eWXIiFEYEHA.716@TK2MSFTNGP11.phx.gbl... > Neil, > > Thank you for the info, very helpful. I just have a few follow up questions. > > If you put ALL the databases in one RAID set, then if that one RAID set goes > down, then everyone on that Exchange server has lost access to their > mailbox, so it seems like it would be less risky to put all the Log files on > the same RAID set b/c if that failed, the users wouldn't lose access to > their mailboxes, right? But is the main reason that you SHOULDN'T put all > log files on one RAID set because the drive head would be all over the place > and therefore would slow things down tremendously? > > > > "Neil Hobson [MVP]" <neil.hobson@nospam.silversands.co.uk> wrote in message > news:O7obXq4XEHA.3044@TK2MSFTNGP09.phx.gbl... > > 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! > > > > > > > > > > > >
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