Re: Fedora14: Strange and intermittent very slow disks on server

2010-12-20 Thread Tim
On Sat, 2010-12-18 at 16:37 +0800, Ian Chapman wrote: > You might also when to check the head load cycle count with smartctl > > smartctl -a /dev/sdX | grep Load_Cycle_Count > > They have stupidly aggressive power saving which as I understand it > cause many unnecessary head parks, depending o

Re: Fedora14: Strange and intermittent very slow disks on server

2010-12-19 Thread Terry Barnaby
On 12/18/2010 04:02 PM, Lamar Owen wrote: > On Saturday, December 18, 2010 03:08:45 am Terry Barnaby wrote: >> It is strange, however, how the system can run perfectly fine with good >> fast disk IO for a while and then go into this slow mode. In the slow >> mode a command can take 30seconds or mor

Re: Fedora14: Strange and intermittent very slow disks on server

2010-12-18 Thread Lamar Owen
On Saturday, December 18, 2010 03:08:45 am Terry Barnaby wrote: > It is strange, however, how the system can run perfectly fine with good > fast disk IO for a while and then go into this slow mode. In the slow > mode a command can take 30seconds or more to run on an unloaded system. > It smacks of

Re: Fedora14: Strange and intermittent very slow disks on server

2010-12-18 Thread Ian Chapman
Hi, > However, I think I will change the drives. I was hoping to try some WD10EADS > ones I have, but after your issues I will look at the RE series or > another make ... Further to what Lamar has already said. I have a pair of these drives running under F14 (originally F13) and I would never b

Re: Fedora14: Strange and intermittent very slow disks on server

2010-12-18 Thread Terry Barnaby
On 12/18/2010 12:00 AM, Lamar Owen wrote: > On Friday, December 17, 2010 06:14:31 pm Terry Barnaby wrote: >> The two main RAID1 disks are WD10EARS (Green). I have seen reported some >> issues with the performance of these but in my case they appear to work >> fine when the system is running ok. > [

Re: Fedora14: Strange and intermittent very slow disks on server

2010-12-17 Thread Lamar Owen
On Friday, December 17, 2010 06:14:31 pm Terry Barnaby wrote: > The two main RAID1 disks are WD10EARS (Green). I have seen reported some > issues with the performance of these but in my case they appear to work > fine when the system is running ok. [snip] > Anyone seen this sort of behaviour befor

Fedora14: Strange and intermittent very slow disks on server

2010-12-17 Thread Terry Barnaby
This is a strange one. I have a home server (Pentium Core 2, Intel ICH10, 1G RAM, 2x SATA 1TByte disks in Raid1, 1x 2TByte SATA and 1 x 1TByte SATA). This is used for normal NFS and MythTv usage as well as httpd, network routing openvpn etc. It has been running for about 2 years and 1 year under F