On Wednesday, 09.11.2005 at 10:46 +0000, Dave Ewart wrote: > System: 4-way Opteron, generic Debian Sarge AMD64 > RAID controller: LSI Logic MegaRAID 320-1, 64MB cache > RAID config: Three 146GB 15K SCSI/320 disks, RAID-5 > Kernel: 2.6.14 SMP, includes megaraid driver > > The above system is incredibly fast under almost all conditions, except > when writing very large files (say, 100s of MB, or even GB). When > writing such files, the system effectively locks-up for many seconds - > typically, for as long as it takes to finish writing/flushing the file > to disk. This lock-up affects all other processes: local text editor > sessions, workstations with /home NFS-mounted, [...] A partial solution to the lock-up for NFS-mounted /home workstations: set the NFS mount option 'async', rather than let it assume the default of 'sync' ... oops. Dave. -- Dave Ewart davee@ceu.ox.ac.uk Computing Manager, Cancer Epidemiology Unit Cancer Research UK / Oxford University PGP: CC70 1883 BD92 E665 B840 118B 6E94 2CFD 694D E370 Get key from http://www.ceu.ox.ac.uk/~davee/davee-ceu-ox-ac-uk.asc N 51.7518, W 1.2016
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