[SATLUG] Software RAID suggestions

Stewart Smith tuupes80 at hotmail.com
Mon Feb 22 11:49:24 CST 2010

The HP raid cards also have either battery back up or in the newest ones flash memory.  The battery/flash holds any unposted information.  You should be able to move that raid card out of a failed computer and onto another one and have it complete the last write.  While this has been a feature for years, I haven't heard of anyone actually doing this.
Software disk mirroring has been a part of the HP suite of high availability software for around 15 years now on the enterprise class UNIX systems.  The idea here is to eliminate any single point of failure.  If you use software raid, and you want to keep the system up, no matter what, mirror across two controllers if you can.

> Subject: Re: [SATLUG] Software RAID suggestions
> To: satlug at satlug.org
> From: kcoriginal at yahoo.com
> Date: Mon, 22 Feb 2010 14:12:13 +0000
> I have had enormous success over the years, with eBay acquired, hp/Compaq hardware RAID cards. Truly enterprise-grade, real, honest hardware RAID cards, for a lot cheaper than you'd think. You can find Ultra 160s and SATA 150s, all day long, for less than $50. Those controllers will handle the newer, faster drives flawlessly; and you get solid RAID peace-of-mind. 
> And, if you want the latest speeds, the Ultra 320s and SATA 300s aren't much over $100, and frequently dip WELL below that figure. Thanks to SAS technology pushing down the prices, these real solutions are available to the rest of us.
> I have found those cards rebuild near-automatically, completely OS independent.
> I have an hp P400 I picked up for $125, shipped - 8 - SATA 300s.
> kc  
> Sent via BlackBerry by AT&T
> -----Original Message-----
> From: FIRESTORM_v1 <firestorm.v1 at gmail.com>
> Date: Mon, 22 Feb 2010 02:44:44 
> To: The San Antonio Linux User's Group Mailing List<satlug at satlug.org>
> Subject: [SATLUG] Software RAID suggestions
> Hello Everyone:
> I have a question concerning software RAID.  Unfortunately I'm cursed
> with the Promise TX4310 "fake" raid card and am wanting to separate
> the RAID array (w/controller) from my gaming rig in an effort to cut
> down on power and with the fact that I recently discovered XBMC (FTW!)
> My experience with software RAID in Linux is many years old and did
> not end on a good note and I was hoping of anyone here had any good
> suggestions/stories/pitfalls that they could share with me.  From
> research I've done with this particular RAID card, the best thing to
> do is to set it for JBOD mode (4x 750GB) and then use the Linux RAID
> tools to build a software RAID set. I plan on using the same setup as
> currently deployed with a RAID 5 configuration.
> I plan to boot from a dedicated hard drive not part of the 4 drive set
> and want this to be as good of a system as I can make it without
> having to worry about losing my data again.
> Unfortunately, the last time I tried this was with IDE drives and when
> one went out, the entire array died and was unrecoverable.  The array
> would not even work in "degraded" mode to allow me to salvage my data.
> A lot of the research I've done in regards to linux support for this
> card has people sayingt that it works, but they never come back to say
> how the performance or the longevity of the array is, fault recovery,
> etc.
> I appreciate your insight and any information you can provide me.
> -- 
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