Hi, I guess I was too vague with some of the details regarding the setup, so I will try to be more specific now. Am 09.04.2013 18:20, schrieb Chris Down: > I assume you're using Linux software RAID Yes. > I've experienced this when using RAID6 and a suboptimal stripe cache > size. I already have tinkered with the stripe cache size, but probably should approach this more systematically. I've found a "tuning" script at [1], but although it increased performance on Ubuntu by a bit, it hadn't any impact on Arch :(. Am 10.04.2013 02:35, schrieb Rafa Griman: > What filesystem? ext4. > What "benchmark" are you running? Simple and plain "old" dd, just as described at [2]. > Stripe size? In both cases the chunk size is 512K, which is quite big, but it is primarily used for video files and works with Ubuntu just fine. > HDDs connected to a PCI(e|X) RAID controller or on board controller? Its an onboard controller. To be more specific, this is what lspci says: 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family SATA AHCI Controller (rev 05) > Those 70 MB/s and 35 MB/s are from a client node or local? I've measured them in both cases (Arch & Ubuntu) locally, but from a client I get very similar results. > If they're from a client node, what are you using: FTP, SAMBA, NFS, ...? I've only tried SMB so far, but given the fact that the results are bad as they are locally, it shouldn't matter here. > Config files? Which ones? Pretty much everything is measured out of the box, partially even using the live environments, so I haven't configured too much at all. As said I've played around with the sysctl settings, but haven't configured anything else that should matter here. Best regards, Karol Babioch [1]: http://ubuntuforums.org/showthread.php?t=1494846 [2]: https://wiki.archlinux.org/index.php/SSD_Benchmarking#Using_dd
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