On Fri Jan 11, 2013, you wrote: > On Jan 11, 2013, at 5:20 AM, Thomas Fjellstrom <thomas@xxxxxxxxxxxxx> wrote: > > On Thu Jan 10, 2013, Chris Murphy wrote: > >> On Jan 10, 2013, at 3:49 AM, Thomas Fjellstrom <thomas@xxxxxxxxxxxxx> wrote: > >>> A lot of it will be streaming. Some may end up being random > >>> read/writes. The test is just to gauge over all performance of the > >>> setup. 600MBs read is far more than I need, but having writes at 1/3 > >>> that seems odd to me. > >> > >> Tell us how many disks there are, and what the chunk size is. It could > >> be too small if you have too few disks which results in a small full > >> stripe size for a video context. If you're using the default, it could > >> be too big and you're getting a lot of RWM. Stan, and others, can > >> better answer this. > > > > As stated earlier, its a 7x2TB array. > > OK fair enough, and as asked earlier, what's the chunk size? Ah, sorry, I missed that bit. I didn't tweak the chunk size, so I have the default 512K. > >> Another thing to look at is if you're using XFS, what your mount options > >> are. Invariably with an array of this size you need to be mounting with > >> the inode64 option. > > > > I'm not sure, but I think that's the default. > > It's not but as Stan writes it may not be preferred for your application. Hm, ok, it is in my mount line, so I'll try it with that off. Though I would be interested in hearing from Stan why it may not be good. > > Plain old seagate baracudas, so not the best but at least they aren't > > greens. > > They probably have a high ERC time out as all consumer disks do so you > should also check /sys/block/sdX/device/timeout and make sure it's not > significantly less than the drive. It may be possible for smartctl or > hdparm to figure out what the drive ERC timeout is. > > http://cgi.csc.liv.ac.uk/~greg/projects/erc/ > > > Debian seems to set up a weekly or monthly scrub, which I leave on due to > > reading that same fact. > > Unless there's a script to email you the results, you'll need to check it > periodically. Or write a script that checks for reported errors and only > sends an email if that's the case. I believe it will send a mail to root. It seems as if its a mdadm/mdmon feature, as the config option is in mdadm.conf. I've set it to send a mail to my main email address, so I should see alerts. > Chris Murphy > > -- > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Thomas Fjellstrom thomas@xxxxxxxxxxxxx -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
