My research into SD card reliability says that even a read-only root won't help
you if you have a different partition mounted read-write on the same SDcard.
The wear-leveling system can cause two partitions to be handed the same flash
block, so that writing into the read-write partition can cause part of the
read-only filesystem to get rewritten and possibly corrupted if the sdcard
write fails.
There's no magic bullet, I fear.
-russ
________________________________________
From: on behalf of Clark
Dunson
Sent: Tuesday, June 19, 2012 12:00 PM
To:
Subject: Re: [ts-7000] read-only Debian on TS-7260
Yes Don, we ship that way. TS-7260/2.6.21 read-only root
This wiki is particularly helpful:
http://wiki.debian.org/ReadonlyRoot
We had to partition the SD card to make room for /var which still must be
mounted RW.
All attempts to mount the NAND on TS-7260 have failed once booted from SD card
have failed though.
On Jun 19, 2012, at 8:18 AM, Don Tucker wrote:
> That's great. The SD card image that I'm currently using was developed for
> the TS-7400, so my procedure can probably follow yours. Did you use the
> unionfs method described in the TS document I linked to?
>
> Don
>
> On 6/19/2012 10:04 AM, Russell N. Nelson - rnnelson wrote:
>> No, but I got it working on a TS-7400.
>> ________________________________________
>> From: on behalf of Don
>> Tucker
>> Sent: Tuesday, June 19, 2012 10:50 AM
>> To:
>> Subject: [ts-7000] read-only Debian on TS-7260
>>
>> I'm currently running a 2.6.21-ts kernel and Debian file system on an SD
>> card with a TS-7260. I'm considering trying to restrict all of the file
>> system writes to a single read-write partition, and leave everything
>> else read-only. I found this resource on Technologic Systems' website
>> that describes setting up a read-only file system for the TS-73XX.
>>
>> http://www.embeddedarm.com/about/resource.php?item=466
>>
>> Has anyone tried this for the TS-72XX?
>>
>> Don
>>
>>
>
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