On Tue, 2002-11-05 at 13:50, Christophe Zwecker wrote:
> im running gentoo with EVMS/LVM on 2.4.19 and XFS on a loop-aes crypted
> device 430GB.
> I have write cache disabled on the 3ware controller. I copied 300 gb
> over network, I noticed that every 50mb or so, the controller stalled,
> didnt accept more data while writing like crazy to disk.
> it took me 24 h to copy 300 gb over 100mbit network. After that I tried
> to turn write cache on, huge more performance. hmm well. I rebooted
> couple of times, suddenley I could mount ther XFS partition any more
> (bad superblock). I disabled write cache again and thank god I could fix
> the issue with xfs_repair.
> So, here I am , disbled write cache, ok. the performance as I stated
> above is awfull, is this how its supposed to be ? disable write cache
> and have terrible performance?
Unfortunately, some hardware is just designed to rely on write
caching. It does seem a little odd that you lost the superblock
though. This is put there by mkfs, and is always present, so how
powering down the device is corrupting it I do not know. That
seems like an issue with the 3ware firmware to me.
Steve Lord voice: +1-651-683-3511
Principal Engineer, Filesystem Software email: lord@xxxxxxx