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Recent content by jocke

  1. J

    Strange issue with PE2950, Perc Raid, and Hitachi 2TB drives

    Sorry to bump such an old thread, but I have exactly the same issue (that is, using PE2950 with SAS 6/ir). The drives I'm using, is Seagate Barracuda 2TB (ST2000DM001). I managed to get a drive online in bay 2, however, this only worked if I pulled out the other drives in bay0-1+3-5. OP; did...
  2. J

    Dell PERC 5/i performance issues

    So, 6x2TB installed, using Dell SAS 6/iR (yes, it supports pass-through of devices not in any array). Partitions on all 6 drives; 6x1MB: bios_grub 6x100MB: use as physical RAID 6x25GB: use as physical RAID 6x~2TB: use as physical RAID mdraid using the above partitions (except bios_grup); md0...
  3. J

    Dell PERC 5/i performance issues

    Okay, so I've bought a Dell SAS 6/iR. It has pass-through support of devices not in any array. I'll stick with the WD2002FAEX, I think. I bought 2 more, and I'm going for 6x2TB in RAID6 using md-raid. Thanks for all the help and inputs in this thread! (-:
  4. J

    Dell PERC 5/i performance issues

    Well, thats the core of the problem; this is a PERC 5/i, not a SAS 5/i. Hence, it's not a MPT-card. In order for me to use this controller with md-raid, I have to set up the 6 drives as 6 individual RAID0's. This is what I'm concerned about, since the controller would be doing RAID against 6...
  5. J

    Dell PERC 5/i performance issues

    Would that be even if the drives is single RAID0 disks on the controller? I mean; the issue with TLER is between the drive and the controller, right? Or does mdraid actually figure these things out, even if the drive is running RAID0? Maybe I'm asking stupid questions here, now, but...
  6. J

    Dell PERC 5/i performance issues

    Auch. I haven't really decided what to do yet. Currently I have 4x2TB WD2002FAEX, and 2x1TB Seagate ST1000DM003. The original plan was to use 2x1TB in RAID1 as system-disks. Then put the 4x2TB as RAID5 for storage. However, with this TLER-thing, it seems I'm stuck with two...
  7. J

    Dell PERC 5/i performance issues

    Yeah, ok. Good. Oh. Snap. I'll have to see if I can get them returned, in exchange for some proper SAS-disks then. Thanks for the heads-up! (-:
  8. J

    Dell PERC 5/i performance issues

    So, I got my storage-disks today; 4x 2TB WD2002FAEX. I initialized two of them as RAID1, and did some tests on it; Using 2.6-kernel; jocke@noshut:~$ ./ddtest.sh Testing 128k bs time sh -c "dd if=/dev/zero of=ddfile1 bs=128k count=262144 && sync" 262144+0 records in 262144+0...
  9. J

    Dell PERC 5/i performance issues

    Ah, I see. I was kinda confused with the 10k vs 15k RPM, yes. (-: 'Write Back' and 'Adaptive Read Ahead' is enabled, so I think so. I'm not sure if there are any other "cache" settings that needs to be set?
  10. J

    Dell PERC 5/i performance issues

    So I would actually be better off with buying some newer drives? Could I expect the "lockups" during high IO to go away as well? Or is the latter more related to the controller, than the disks?
  11. J

    Dell PERC 5/i performance issues

    Hi, Thanks for the feedbacks. I've done several more tests now, and neither dmesg, nor /var/log/messages, produce any errors while doing these tests.
  12. J

    Dell PERC 5/i performance issues

    So, without any IO at all; jocke@noshut:~$ time ls -alh /var | grep lolol real 0m1.275s user 0m0.000s sys 0m0.000s It's not consistent; i.e. it doesn't happen every time, but often enough. This couldn't be caused by badly aligned partitions or something? Or just bad drives?
  13. J

    Dell PERC 5/i performance issues

    So, tried with new kernel (from backports, though, not sure if that has any effect?); root@noshut:~# uname -a Linux noshut 3.2.0-0.bpo.1-amd64 #1 SMP Sat Feb 11 08:41:32 UTC 2012 x86_64 GNU/Linux root@noshut:~# cat /proc/version Linux version 3.2.0-0.bpo.1-amd64 (Debian 3.2.4-1~bpo60+1)...
  14. J

    Dell PERC 5/i performance issues

    Phew. Good. Then I know that there is a problem. Started to wonder if I where trying to solve a problem that didn't exist (-: Yes, "ancient" kernel (running Debian Squeeze). root@noshut:~# uname -a Linux noshut 2.6.32-5-amd64 #1 SMP Sun May 6 04:00:17 UTC 2012 x86_64 GNU/Linux...
  15. J

    Dell PERC 5/i performance issues

    Hi, It seems like I'm having some performance-issues with my PERC 5/i card. I have a Dell PE 2950, with a PERC 5/i installed. I have 2x 300GB Seagate Cheetah T10 15K RPM (ST3300555SS) in a RAID1-setup. While copying stuff, or when doing dd-tests, the system is almost unusable...
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