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PERC 5/i RAID Card: Tips and Benchmarks - Page 203

post #2021 of 7188
This card is good. Many times I have had to reset the box under heavy IO (like benchmark) and the firmware on next reboot, makes sure to flush the cache. So, make sure you reboot after a crash before your BBU runs out of juice, so that the firmware gets to flush the cache to disks.
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post #2022 of 7188
Quote:
Originally Posted by RobiNet View Post
I know but if your system is stable - and you have UPS ... you can set even 255
I think card will flush cache automatically for new files, right ?
it doesn't know what is a "new file".

So, have defense against failures:

0. Backup. Backup again. Backup! Oh, I said it twice already....

1. have a BBU and make sure to keep it charged (i.e. not disconnected for long times).

2. make sure you let your system reboot, with the drives still connected and powered on, after a crash to give the firmware a chance to flush the cache. Even if it is just to the boot menu or to get into BIOS setup.

3. have a good UPS to protect against a bad BBU. I hit this one. BBUs go bad. Mine went with a chattering big bang kinda noise. Was scary but I didn't know whether it was BBU or something else. Took a long time to debug that it was the dead BBU that made my card vanish and my PSU behave weird.
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post #2023 of 7188
Quote:
Originally Posted by devsk
This value can be set larger with 512MB cache module vs. 256Mb cache module on your card. So, there you have it: one advantage of 512MB module....;-)
is there any parameter for setting policy for most used files ?
i.e. I'm working for 2 hours on one 20MB file (many times read/write operations) - and now I want to copy 2GB of data - do my file stay in cache or will be removed ?
post #2024 of 7188
anyone know if you can set a longer cache flush interval with the dell firmware?
post #2025 of 7188
Quote:
Originally Posted by devsk
it doesn't know what is a "new file".
no, no by "new file" I meant "when card need to read new files - will it flush currently cached files to make space for new files before CacheFlushInterval"
post #2026 of 7188
I got this card about a week ago for a file server and just started using it yesterday. Im still waiting for my files to finish transferring as I type. I spent some time testing each port and figuring out its behaviors when I add/remove disks and such. Everything worked as expected and OS installation went smooth with drivers auto-detected.

No pin modding, no firmware flashing.

Mobo: Supermicro PDSBM
OS: Debian Lenny
post #2027 of 7188
Quote:
Originally Posted by {core2duo}werd View Post
anyone know if you can set a longer cache flush interval with the dell firmware?
I am using Dell firmware (and happy with 10% slow down....) and I set it to 30 seconds. But I have no reason to believe that you can't go all the way to 255 with Dell firmware.
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post #2028 of 7188
Quote:
Originally Posted by devsk View Post
I am using Dell firmware (and happy with 10% slow down....) and I set it to 30 seconds. But I have no reason to believe that you can't go all the way to 255 with Dell firmware.
how did you set it?
post #2029 of 7188
Quote:
Originally Posted by RobiNet View Post
no, no by "new file" I meant "when card need to read new files - will it flush currently cached files to make space for new files before CacheFlushInterval"
Reads are driven by readahead mechanism. I don't think the card will use all of 256MB for readahead because its major business is caching writes because those require parity calculation and another write for parity info.

But there are too many layers involved and too many parameters to say with a guarantee that your 20MB file will be in cache when you read that big 2GB file. OS caches your Filesystem info, so that gets driven by how much RAM you have and how many other programs are active. That also gets tied into whether you are swapping (writing page file) or not. Larger programs may generate page file traffic. NTFS itself is generating log file writes to the disk periodically (and it looks more aggressive than most other FSs I know).

In nutshell, its hard to answer your question. But overall, if your system is quiet, and you have just one 20MB file dirty and you are doing read on 2GB file, your 20MB file will likely be in cache (either OS cache or the card cache).
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post #2030 of 7188
Quote:
Originally Posted by {core2duo}werd View Post
how did you set it?
someone posted the link to the other post I made about using MegaCli.

http://www.overclock.net/hard-drives...ml#post5894634
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