Tags: compact flash

07/24/11

  11:49:00 am, by The Dreamer   , 2214 words  
Categories: Digital Photography, Hardware, Software, Computer, DVDs / NetFlix, WiFi, Storage

Morning Orac outage

Well, Orac was being somewhat unresponsive this morning.... Looks like early this morning the system stopped answering to Cacti, with the temperature of the GPU rising to a new high. Don't know what the high would've been, because there was no snmp data for a while. GPU temp did recover, but the display did not.

Ended up rebooting, needed the excuse to see external journal work....

Once backup, I switched back to internal journal...but one of maximum size rather than default size. And, then shutdown the system to extract the PCI Compact Flash card. During the reboot to see external journal work...I realized that I wasn't likely to see much performance gain from getting faster compact flash since the card itself was only UDMA/66. So the 133x CF is already faster than the card?

Probably should've fsck'd manually after the switch back....some discussion thread suggested doing this after fiddling with journal settings. But, its fsck'ng now after the boot back up. Apparently superblock had invalid external journal superblock hint? And, auto fsck failed, requiring manual fsck.

Downside of internal journal is that it can only be a max of 400MB (an improvement from the 128MB default I had before)...but that's only like 0.01% of my total space. And, there was a discussion thread that seemed to suggest a journal size of 0.2% would yield better improvement....I didn't do the whole 16GB CF card...though wonder how much that would've helped.... But 0.2% would call for a journal of ~10.9GB. Suppose I could turn off data journaling, especially since there are files that backuppc puts down that are bigger than the 400MB journal. Though I think the ordered/writeback modes usually just do metadata journaling, while I had switched it to data journaling when I was playing with external journals...but I didn't switch it back.

Wonder which of writeback or ordered would be more optimal for this FS? :??:

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07/23/11

  10:35:28 pm, by The Dreamer   , 614 words  
Categories: Hardware, Computer, Storage

What was to be a quick Orac upgrade, was a bit more.

The other day when I was shopping for quieter 120mm fan for my TR5M-BP enclosure, I thought about getting a bigger/better fan for Orac. I knew there were holes to take a fan larger than the one that was current in it.

Though I guess I should've measured or something. Because after I had the old fan out and things apart...found the fan that I had gotten was too big. I started putting things back, when I decided I might as well do the other things I wanted to do.

First the mirror of the internal RAID1 was failing.....the original had failed early and I exchanged it for a recertified one from Seagate and put in a different drive. Interesting that the warranty of the replacement drive seems to have expired, while the warranty of the original ST3500630AS is still active.

I was trying to decide if I buy a new 500GB drive, or put the recertified one in. Seeing as I had things open...and I hadn't bought a new drive yet. I put the recertified one in. I also had that project to put in a PCI compact flash card in. Though I hadn't gotten the desired compact flash card, yet. But, did have a 16GB 133x card sitting around...so I decided use that for now. The 8GB 600x card will have to come later.

I then put everything back...and watched to take forever to boot....the PCI compact flash card seems to slow the boot down a lot, and I don't know why. Maybe I don't want it now. May need to rethink the experiment. Perhaps when I get a correct sized fan and open it up next.

And, then it didn't....guess in everything, I forgot to reconnect the case fan. Oh well, the silly clamp does a lousy job holding the unsupported slot covers in place...and putting cables back in, the bracket pushed in. They probably knew that since the blank has a hook on it, but the eSATA bracket is a regular kind...but no room to slip a screw in to properly secure it.

So, opened things up and then tried it all again.

Oh yeah, while I had it open the first time, I noticed the CPU heatsink was all full of dust, so I blew that out.

Well, things came up slowly....of course the boot RAID1 was degraded. I then sfdisk'd the new drive, and added it back to the md0/md1....should be done in an hour or so (from now, not when I added it...)

And, then went to fiddle with the compact flash card as an external journal of an ext4 filesystem. Forgot that I was originally playing around with the idea of external bitmaps when I had gotten the idea for the compact flash....but concluded that it wasn't going to work, there's no way to have a filesystem exist during that stage of boot. Not sure if an external journal helps with performance or not....might have been something back when I was doing RAID5/6....but not sure its important enough with RAID10. Don't really have any way to measure if it makes any real-world improvement to what I'm doing.

Meanwhile...I updated cacti, the card shifted all my drives around.... And, seems the CPU is now running a bit cooler than it was before....but the GPU is running hotter than before.

Guess clearing the dust out of the heatsink was good, but adding the PCI card was bad.

I think keep things cool is more important than the external journal experiment...so I will probably yank the compact flash card out when I get the new fan. Wonder if a PCI slot cooler would be something I put in instead?

Now instead of subjecting some poor random forum to a long rambling thought, I will try to consolidate those things into this blog where they can be more easily ignored profess to be collected thoughts from my mind.

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