dang. I guess I gloat too much about my lack of Apple hardware failures. Anyone else ever had this? I don't want to shut down my system to haul it to the service center. It may cause a huge power surge to the neighborhood if I turn it off!
Whoa! That's weird!The UPS suggestion doesn't quite work. If the battery on the card is dead, it disables the write cache. Also it won't allow you to do the raid 5 conversion when the battery has failed. The apple raid utility gives a bizarre command not supported error if the battery isn't fully charged when you try to do the conversion. Yes, I also have the system on a UPS.
Whoa! That's weird!
I've never heard of a card that locks out the cache without the battery. They're usually an option, and a UPS is a better one.
Is it possible Apple placed a software setting somewhere?
I had the battery failure described in this thread. I lived with it for 6 months and then finally got around to calling Apple tech support (the machine is still under warranty). Tech support sent me a new battery, which I installed (it took about an hour to figure out how to dig down to the old one without breaking any cables etc).
Anyhow, after putting in the new battery, I get the same warning on reboot ("The RAID card requires your attention...") but when I launch the RAID Utility, it crashes after about 1 or 2 seconds. It stays on the screen just long enough for me to see that it (RAID Utility) does not seem to be aware of the new battery.
So now I have to call Apple tech support again. Such a time sink.
Whoa! That's weird!
I've never heard of a card that locks out the cache without the battery. They're usually an option, and a UPS is a better one.
Is it possible Apple placed a software setting somewhere?
I know the battery and UPS are different, and why they're used. And ideally, both should be used. Even in the case of a redundant PSU.The battery on an array controller is not equivalent to a UPS. They both supply power in case of a power failure, but that's where the similarities end. You cannot replace one with the other, and one is not better than the other, as they serve two different purposes. In case of a power failure, the UPS supplies power to the entire system, while the array controller battery supplies power to the memory on the array controller, usually for around 4 days. Of course, on our systems I use both.
My point is, that it's listed as an option, not mandatory. Though I do believe in using them. I've even seen a case where the option was listed, but the manufacturer hasn't actually made them available. Atto Technology comes to mind, and they are decent, well rated cards. My experience with them has been quite good. Areca as well, my current favorite for price/performance, but the BBU is available.Every array system we have will disable the write cache when the array controller's battery fails. This is to ensure all data is written directly to disk and not stored in the array controller's memory. It's never an option; it's designed by the manufacturer.
I've never heard of this either, until reading it in this thread.That said, I've never heard of any array controller reconditioning the battery on a periodic basis.
I know the battery and UPS are different, and why they're used. And ideally, both should be used. Even in the case of a redundant PSU.
A UPS would be an alternative to the battery on the RAID card.
It offers additional benefits as well, so it may be worth it in the long run if at all possible.
For a Mac Pro, 1500VA would do nicely.
I hope Apple solves your problem, and quickly.
Good Luck.![]()
My point is, that it's listed as an option, not mandatory. Though I do believe in using them. I've even seen a case where the option was listed, but the manufacturer hasn't actually made them available. Atto Technology comes to mind, and they are decent, well rated cards. My experience with them has been quite good. Areca as well, my current favorite for price/performance, but the BBU is available.
In using various cards, the cache could be set, and would operate without the battery. It wasn't automatically disabled if the battery wasn't present. No BBU sensor perhaps, and it works either way. At the user's peril of course.![]()
I've never heard of this either, until reading it in this thread.
I'll try to clarify what I meant.Then why say a UPS is an alternative to an array controller battery? The redundant PSU will only save you if one PSU fails, so I'm not seeing where that fits either. Maybe I'm just reading this all wrong.
It wasn't, and still isn't, clear what you mean.
The battery is typically listed as an option, and it isn't made clear in the technical specifications page that the battery must be used to enable write cache. Or the documentation, once you have that in hand. Manual downloads are nice, as you can at least check, if you know to do so.For read cache, you always have it without a battery, but for a write cache a battery is required. I'm not sure if this is the same on really low-end equipment though. Having a write cache without a battery would equal peril some day.![]()
I wish the batteries were always included. No matter the manufacturer. It would certainly simplify the process of having to locate them.Ah, gotcha. I knew I wasn't reading it right.
Yeah, most of the array controllers for servers have the battery as an option to buy. I originally thought you meant an option in the firmware to turn on or off without a battery.
On the EVAs and XPs from HP, the batteries are included (and should be for what you pay).![]()
dang. I guess I gloat too much about my lack of Apple hardware failures. Anyone else ever had this? I don't want to shut down my system to haul it to the service center. It may cause a huge power surge to the neighborhood if I turn it off!
Sorry this is happening to you
but... So glad I didn't go with the Apple RaidCard,
imagine going through this every few months... what a nightmare!![]()