Thank you all, I wiil do analysis to verify the problem about storage. By Obe. On 24/11/2011 14:17, Andy Bennett wrote: > Hi, > >>> What IO subsystem do you have on this machine? What filesystem are you >>> using? >> I have 4 HDD 500GB S SATA II >> with LSI 8704 ELP SAS >> RAID 6 >> filesystem ext3 mounted with noatime, nodiratime > >> this my vmstat after I run the command find -type f | xargs cat> >> /dev/null : >> >> http://www.digicolor.net/cyrus/img7.jpg > This is a very sad set of numbers. :-( It's still really, really choppy > and the dead spots don't seem to correlate particularly well with bo > activity. > > Have you got someone who can help you debug your storage array and > ensure that it's not degraded in some way? Is the battery empty? Are > there any disks which are failing? Do all the disks have their write > caches and retry handling set up correctly? > > How old is your file system? Have you been running it near capacity > (>70% full) for long periods of time? > > You might be able to tell whether you have a file system problem or an > array problem by comparing your previous vmstat with the results > obtained from 'sudo /sbin/haparm -tT /dev/<spool dev>'. For reference, > on my disk I get: > > ----- > $ sudo /sbin/hdparm -tT /dev/sda > > /dev/sda: > Timing cached reads: 3272 MB in 2.00 seconds = 1637.05 MB/sec > Timing buffered disk reads: 194 MB in 3.02 seconds = 64.18 MB/sec > ----- > > I'd certainly not expect anything less from your array. I'd hope for at > least 100MB/sec if not a lot more. > > > > > > > Regards, > @ndy > -- Oberdan Albertoni ----------------------------------------------------------------------------------------------------------------------------------------------------------- DIGICOLOR.NET s.r.l. Via Ala Ponzone, 30 - 26100 CREMONA (CR) Tel. +39 (0372) 30669 - 1965101 - 1951509 Fax +39 (0372) 464840 E-mail info@xxxxxxxxxxxxx - Website http://www.digicolor.net C.F / P.IVA 01227520192 - R.E.A. CR n. 153382 - Capitale Sociale € 10.400 i.v. Filiale di Codogno Via Galilei, 17 – 26845 CODOGNO (LO) Tel. +39 (0377) 741006 – 431931 Fax +39 (0372) 464840 E-mail info.codogno@xxxxxxxxxxxxx - Website http://www.digicolor.net ----------------------------------------------------------------------------------------------------------------------------------------------------------- Ai sensi del D.lgs n.196 del 30.06.03 (Codice Privacy) si precisa che le informazioni contenute in questo messaggio sono riservate e ad uso esclusivo del destinatario. Qualora il messaggio in parola Le fosse pervenuto per errore, La preghiamo di eliminarlo senza copiarlo e di non inoltrarlo a terzi, dandocene gentilmente comunicazione. Grazie This message, for the D.lgs n.196 / 30.06.03 (Privacy Code), may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation. ----------------------------------------------------------------------------------------------------------------------------------------------------------- ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/
