unRAID Server Release 5.0-rc12 Available


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Monthy Parity Check ran:

 

Last checked on Mon Apr 1 11:50:31 2013 PDT (yesterday), finding 0 errors.

> Duration: 11 hours, 50 minutes, 28 seconds. Average speed: 70.4 MB/sec

 

good / ok / or bad?

Entirely depends on the hardware involved.

 

My newer array with 6 data drives, 10.5TB total storage (largest disk=2TB):

Apr  1 07:42:20 Tower kernel: md: sync done. time=27738sec

Apr  1 07:42:20 Tower kernel: md: recovery thread sync completion status: 0

 

My older PCI bus based array with 11 data drives, 6.1TB total storage took over twice as long (largest disk=1TB):

Apr  1 14:05:40 Tower2 kernel: md: sync done. time=50736sec rate=19251K/sec

Apr  1 14:05:40 Tower2 kernel: md: recovery thread sync completion status: 0

 

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Ok, cool.  Sounds like I'm in the ballpark and just need to get rid of the smaller drives.  I'll watch for a deal and get them all to 3tb.

 

Might I ask why you have a 5400 rpm drive as your cache? Wouldn't you want to have a faster drive as your cache?

 

Cache speed is limited by Ethernet to 125MBps. Newer 5400 drives can reach this speed. There is no reason to use a cache that is faster than 125 MBps, unless you plan to run the mover while writing. Then a SSD is useful.

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Cache speed is limited by Ethernet to 125MBps. Newer 5400 drives can reach this speed. There is no reason to use a cache that is faster than 125 MBps, unless you plan to run the mover while writing. Then a SSD is useful.

It depends if you use your cache drive for other things than just simply writing data.

 

A 7200rpm drive is much more useful if you are using the cache drive for usenet and bittorrent apps, for example. Par repairs are quicker, for example.

 

Also, if you are hitting the drive hard -- reading and writing to the drive while streaming data off it, for example, the faster the drive, the better.

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Ok, cool.  Sounds like I'm in the ballpark and just need to get rid of the smaller drives.  I'll watch for a deal and get them all to 3tb.

 

Might I ask why you have a 5400 rpm drive as your cache? Wouldn't you want to have a faster drive as your cache?

 

Likely won't make much if any difference.

 

I will say though why waste a 2TB disk on a cache drive? When do you ever need anywhere near that amount in cache? I say swap that 1TB Samsung to cache and 2TB WD to the array.

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I have 8 Drives + Parity, 1 drive + parity is 4Tb the others are various 3Tb drives.  I think one may be slower than the rest, just did parity check time=44291sec started about 120Mb/s at 2.5Tb it was down to 65Mb/sec then once it ticked over to 3.1tb (no more 3tb Drives) it went back up to 100Mb/sec. 

 

I think it may be one of my oldest WD Greens but not sure.

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a little late to the party - Installed rc12a upgrading from rc10.  Parity check is avg-ing 74MB/s with rc12a compared to 47MB/s with rc10.  Good to see the improvement though it's not really a pain in the rear for the current system I have.

 

Thanks Tom for all the hard work! and to the rest of the unRAID community, you guys/gals continually push to make this an awesome product, Thank you!!

 

J

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i am having these errors with rc12a.

 

Apr  2 22:48:56 UNRAID kernel: INFO: rcu_sched self-detected stall on CPU { 0}  (t=6000 jiffies)
Apr  2 22:48:56 UNRAID kernel: Pid: 9597, comm: unraidd Not tainted 3.4.36-unRAID #1 (Errors)
Apr  2 22:48:56 UNRAID kernel: Call Trace: (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1057cda>] print_cpu_stall+0x6d/0xe5 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1057d8d>] __rcu_pending+0x3b/0x138 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1057f00>] rcu_check_callbacks+0x76/0xa1 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c102ca52>] update_process_times+0x2d/0x58 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c104b25f>] tick_periodic+0x63/0x65 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c104b27a>] tick_handle_periodic+0x19/0x6f (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c10180e4>] smp_apic_timer_interrupt+0x6d/0x7f (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1342a0a>] apic_timer_interrupt+0x2a/0x30 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c106007b>] ? T.592+0xb7/0xed (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c13423f8>] ? _raw_spin_unlock_irqrestore+0x8/0xa (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1240fd6>] __scsi_put_command+0x3e/0x5a (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c124103d>] scsi_put_command+0x4b/0x50 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c124572e>] scsi_next_command+0x21/0x34 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1245c50>] scsi_end_request+0x66/0x70 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1245f76>] scsi_io_completion+0x1b0/0x3fd (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c134007b>] ? powernowk8_init+0x15/0x195 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1245d0d>] ? scsi_device_unbusy+0x7c/0x82 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1240e2e>] scsi_finish_command+0x9d/0xa3 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1246297>] scsi_softirq_done+0xc5/0xcd (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c11a5762>] blk_done_softirq+0x4a/0x57 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1028669>] __do_softirq+0x6b/0xfa (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c10285fe>] ? irq_enter+0x41/0x41 (Errors)
Apr  2 22:48:56 UNRAID kernel:  <IRQ>  [<c10284b2>] ? irq_exit+0x32/0x58
Apr  2 22:48:56 UNRAID kernel:  [<c1003713>] ? do_IRQ+0x87/0x9b (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c104030d>] ? try_to_wake_up+0x1a6/0x1b0 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1343369>] ? common_interrupt+0x29/0x30 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c103007b>] ? sys_prctl+0x176/0x23d (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c13423f8>] ? _raw_spin_unlock_irqrestore+0x8/0xa (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c103d16d>] ? __wake_up+0x3b/0x42 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<f85fbf3e>] ? md_done_sync+0x2b/0x2f [md_mod] (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<f85ff94b>] ? handle_stripe+0xb4b/0xcf6 [md_mod] (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c103d16d>] ? __wake_up+0x3b/0x42 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<f85ffb6e>] ? unraidd+0x78/0xbc [md_mod] (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<f85fcb7e>] ? md_thread+0xcc/0xe3 [md_mod] (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1037a8d>] ? wake_up_bit+0x5b/0x5b (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<f85fcab2>] ? import_device+0x166/0x166 [md_mod] (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1037794>] ? kthread+0x67/0x6c (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c103772d>] ? kthread_freezable_should_stop+0x49/0x49 (Errors)
Apr  2 22:48:56 UNRAID kernel:  [<c1343376>] ? kernel_thread_helper+0x6/0xd (Errors)
Apr  2 22:51:55 UNRAID kernel: INFO: rcu_sched self-detected stall on CPU { 0}  (t=6000 jiffies)
Apr  2 22:51:55 UNRAID kernel: Pid: 9597, comm: unraidd Not tainted 3.4.36-unRAID #1 (Errors)
Apr  2 22:51:55 UNRAID kernel: Call Trace: (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1057cda>] print_cpu_stall+0x6d/0xe5 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1057d8d>] __rcu_pending+0x3b/0x138 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1057f00>] rcu_check_callbacks+0x76/0xa1 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c102ca52>] update_process_times+0x2d/0x58 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c104b25f>] tick_periodic+0x63/0x65 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c104b27a>] tick_handle_periodic+0x19/0x6f (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c10180e4>] smp_apic_timer_interrupt+0x6d/0x7f (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1342a0a>] apic_timer_interrupt+0x2a/0x30 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c124007b>] ? ide_settings_proc_show+0x48/0x1c7 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c12454e6>] ? scsi_request_fn+0x2b2/0x36e (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c11a016f>] __blk_run_queue+0x14/0x16 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c11a0437>] blk_run_queue+0x1b/0x2c (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1244dd6>] scsi_run_queue+0xe4/0x151 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1245735>] scsi_next_command+0x28/0x34 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1245c50>] scsi_end_request+0x66/0x70 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1245f76>] scsi_io_completion+0x1b0/0x3fd (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1343369>] ? common_interrupt+0x29/0x30 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1245d0d>] ? scsi_device_unbusy+0x7c/0x82 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1240e2e>] scsi_finish_command+0x9d/0xa3 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1246297>] scsi_softirq_done+0xc5/0xcd (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c11a5762>] blk_done_softirq+0x4a/0x57 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1028669>] __do_softirq+0x6b/0xfa (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c10285fe>] ? irq_enter+0x41/0x41 (Errors)
Apr  2 22:51:55 UNRAID kernel:  <IRQ>  [<c10284b2>] ? irq_exit+0x32/0x58
Apr  2 22:51:55 UNRAID kernel:  [<c1003713>] ? do_IRQ+0x87/0x9b (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c104030d>] ? try_to_wake_up+0x1a6/0x1b0 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1343369>] ? common_interrupt+0x29/0x30 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c103007b>] ? sys_prctl+0x176/0x23d (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c13423f8>] ? _raw_spin_unlock_irqrestore+0x8/0xa (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c103d16d>] ? __wake_up+0x3b/0x42 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<f85fbf3e>] ? md_done_sync+0x2b/0x2f [md_mod] (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<f85ff94b>] ? handle_stripe+0xb4b/0xcf6 [md_mod] (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c103d16d>] ? __wake_up+0x3b/0x42 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<f85ffb6e>] ? unraidd+0x78/0xbc [md_mod] (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<f85fcb7e>] ? md_thread+0xcc/0xe3 [md_mod] (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1037a8d>] ? wake_up_bit+0x5b/0x5b (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<f85fcab2>] ? import_device+0x166/0x166 [md_mod] (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1037794>] ? kthread+0x67/0x6c (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c103772d>] ? kthread_freezable_should_stop+0x49/0x49 (Errors)
Apr  2 22:51:55 UNRAID kernel:  [<c1343376>] ? kernel_thread_helper+0x6/0xd (Errors)
Apr  2 22:54:07 UNRAID kernel: INFO: rcu_sched self-detected stall on CPU { 0}  (t=6000 jiffies)
Apr  2 22:54:07 UNRAID kernel: Pid: 9597, comm: unraidd Not tainted 3.4.36-unRAID #1 (Errors)
Apr  2 22:54:07 UNRAID kernel: Call Trace: (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1057cda>] print_cpu_stall+0x6d/0xe5 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1057d8d>] __rcu_pending+0x3b/0x138 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1057f00>] rcu_check_callbacks+0x76/0xa1 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c102ca52>] update_process_times+0x2d/0x58 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c104b25f>] tick_periodic+0x63/0x65 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c104b27a>] tick_handle_periodic+0x19/0x6f (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c10180e4>] smp_apic_timer_interrupt+0x6d/0x7f (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1342a0a>] apic_timer_interrupt+0x2a/0x30 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c124007b>] ? ide_settings_proc_show+0x48/0x1c7 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c12454e6>] ? scsi_request_fn+0x2b2/0x36e (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c108629f>] ? kmem_cache_free+0x86/0x8e (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c11a016f>] __blk_run_queue+0x14/0x16 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c11a0437>] blk_run_queue+0x1b/0x2c (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1244dd6>] scsi_run_queue+0xe4/0x151 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1245735>] scsi_next_command+0x28/0x34 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1245c50>] scsi_end_request+0x66/0x70 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1245f76>] scsi_io_completion+0x1b0/0x3fd (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1245d0d>] ? scsi_device_unbusy+0x7c/0x82 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1240e2e>] scsi_finish_command+0x9d/0xa3 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1246297>] scsi_softirq_done+0xc5/0xcd (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c11a5762>] blk_done_softirq+0x4a/0x57 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1028669>] __do_softirq+0x6b/0xfa (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c10285fe>] ? irq_enter+0x41/0x41 (Errors)
Apr  2 22:54:07 UNRAID kernel:  <IRQ>  [<c10284b2>] ? irq_exit+0x32/0x58
Apr  2 22:54:07 UNRAID kernel:  [<c1003713>] ? do_IRQ+0x87/0x9b (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1037aa4>] ? autoremove_wake_function+0x17/0x34 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1343369>] ? common_interrupt+0x29/0x30 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<f85fef3c>] ? handle_stripe+0x13c/0xcf6 [md_mod] (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c103d16d>] ? __wake_up+0x3b/0x42 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<f85ffb6e>] ? unraidd+0x78/0xbc [md_mod] (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<f85fcb7e>] ? md_thread+0xcc/0xe3 [md_mod] (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1037a8d>] ? wake_up_bit+0x5b/0x5b (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<f85fcab2>] ? import_device+0x166/0x166 [md_mod] (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1037794>] ? kthread+0x67/0x6c (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c103772d>] ? kthread_freezable_should_stop+0x49/0x49 (Errors)
Apr  2 22:54:07 UNRAID kernel:  [<c1343376>] ? kernel_thread_helper+0x6/0xd (Errors)
Apr  2 22:56:12 UNRAID kernel: INFO: rcu_sched self-detected stall on CPU { 0}  (t=6000 jiffies)
Apr  2 22:56:12 UNRAID kernel: Pid: 9597, comm: unraidd Not tainted 3.4.36-unRAID #1 (Errors)
Apr  2 22:56:12 UNRAID kernel: Call Trace: (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1057cda>] print_cpu_stall+0x6d/0xe5 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1057d8d>] __rcu_pending+0x3b/0x138 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1057f00>] rcu_check_callbacks+0x76/0xa1 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c102ca52>] update_process_times+0x2d/0x58 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c104b25f>] tick_periodic+0x63/0x65 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c104b27a>] tick_handle_periodic+0x19/0x6f (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c10180e4>] smp_apic_timer_interrupt+0x6d/0x7f (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1342a0a>] apic_timer_interrupt+0x2a/0x30 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c124007b>] ? ide_settings_proc_show+0x48/0x1c7 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c12454e6>] ? scsi_request_fn+0x2b2/0x36e (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c11a016f>] __blk_run_queue+0x14/0x16 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c11a0437>] blk_run_queue+0x1b/0x2c (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1244dd6>] scsi_run_queue+0xe4/0x151 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1245735>] scsi_next_command+0x28/0x34 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1245c50>] scsi_end_request+0x66/0x70 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1245f76>] scsi_io_completion+0x1b0/0x3fd (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1343369>] ? common_interrupt+0x29/0x30 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1245d0d>] ? scsi_device_unbusy+0x7c/0x82 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1240e2e>] scsi_finish_command+0x9d/0xa3 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1246297>] scsi_softirq_done+0xc5/0xcd (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c11a5762>] blk_done_softirq+0x4a/0x57 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1028669>] __do_softirq+0x6b/0xfa (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c10285fe>] ? irq_enter+0x41/0x41 (Errors)
Apr  2 22:56:12 UNRAID kernel:  <IRQ>  [<c10284b2>] ? irq_exit+0x32/0x58
Apr  2 22:56:12 UNRAID kernel:  [<c1003713>] ? do_IRQ+0x87/0x9b (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c104030d>] ? try_to_wake_up+0x1a6/0x1b0 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1343369>] ? common_interrupt+0x29/0x30 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c103007b>] ? sys_prctl+0x176/0x23d (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c13423f8>] ? _raw_spin_unlock_irqrestore+0x8/0xa (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c103d16d>] ? __wake_up+0x3b/0x42 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<f85fbf3e>] ? md_done_sync+0x2b/0x2f [md_mod] (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<f85ff94b>] ? handle_stripe+0xb4b/0xcf6 [md_mod] (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c103d16d>] ? __wake_up+0x3b/0x42 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<f85ffb6e>] ? unraidd+0x78/0xbc [md_mod] (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<f85fcb7e>] ? md_thread+0xcc/0xe3 [md_mod] (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1037a8d>] ? wake_up_bit+0x5b/0x5b (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<f85fcab2>] ? import_device+0x166/0x166 [md_mod] (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1037794>] ? kthread+0x67/0x6c (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c103772d>] ? kthread_freezable_should_stop+0x49/0x49 (Errors)
Apr  2 22:56:12 UNRAID kernel:  [<c1343376>] ? kernel_thread_helper+0x6/0xd (Errors)

 

and it keeps on going...

Never saw these with rc5.

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- Did a parity check on rc12a last night, was finished this morning but i couldnt find any stats on how long it actually took and how fast in MB/s... only that it was finished without errors. I guess it took about 8 hours, so that is good, but no stats. Couldnt find them in syslog either or in unmenu.

 

- Browsing the unraid machine from Windows 7 gives me the slow annoying green searchbar of death time after time, even with cache_dirs installed and drives are spinned up. Never had those problems with rc5.

 

This, and the cpu errors above made me decide to go back to rc5. Again.

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Cache speed is limited by Ethernet to 125MBps. Newer 5400 drives can reach this speed. There is no reason to use a cache that is faster than 125 MBps, unless you plan to run the mover while writing. Then a SSD is useful.

A fast SSD combined with 10GBase-T Ethernet sounds quite attractive to me, especially if you plan to do things like video remuxing/editing on the cache drive.

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Ok, cool.  Sounds like I'm in the ballpark and just need to get rid of the smaller drives.  I'll watch for a deal and get them all to 3tb.

 

Might I ask why you have a 5400 rpm drive as your cache? Wouldn't you want to have a faster drive as your cache?

 

The quick and dirty is that my old cache drive died and I had this green 5400 with 64mb of cache laying around, so I used it. While the 5400 is not so good, the 64mb of cache seems to help offset that.  That said, I plan on installing a SSD drive, just waiting for a cheap 1tb SSD drive to go on sale.

 

Oh and I use my cache drive for my Plex plugin, so it's running all the time.  Having it green and at 5400 helps, given it never sleeps.

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Ok, cool.  Sounds like I'm in the ballpark and just need to get rid of the smaller drives.  I'll watch for a deal and get them all to 3tb.

 

Might I ask why you have a 5400 rpm drive as your cache? Wouldn't you want to have a faster drive as your cache?

 

The quick and dirty is that my old cache drive died and I had this green 5400 with 64mb of cache laying around, so I used it. While the 5400 is not so good, the 64mb of cache seems to help offset that.  That said, I plan on installing a SSD drive, just waiting for a cheap 1tb SSD drive to go on sale.

 

Oh and I use my cache drive for my Plex plugin, so it's running all the time.  Having it green and at 5400 helps, given it never sleeps.

 

 

Why do you feel like you need such a large cache drive? I have a 320GB cache drive and that was overkill even when I was running tons of plugins that were storing data on it. At $1000 plus, you're going to be waiting a while for a reasonably priced 1TB SSD.

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The quick and dirty is that my old cache drive died and I had this green 5400 with 64mb of cache laying around, so I used it. While the 5400 is not so good, the 64mb of cache seems to help offset that.  That said, I plan on installing a SSD drive, just waiting for a cheap 1tb SSD drive to go on sale.

 

Oh and I use my cache drive for my Plex plugin, so it's running all the time.  Having it green and at 5400 helps, given it never sleeps.

 

Why do you feel like you need such a large cache drive? I have a 320GB cache drive and that was overkill even when I was running tons of plugins that were storing data on it. At $1000 plus, you're going to be waiting a while for a reasonably priced 1TB SSD.

 

Would have to agree with this.  Unless you are copying massive amounts of new data to your array every day using the cache drive to speed up writes, 1TB is overkill.  I also have a 320GB cache, it's what I had on hand, so I used it.  Granted, I don't use the cache to speed up array writes, I only use it for all the plugins that run on my box, but it's still many times larger than I need.

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IMO the main reason to have a "big" cache drive is speed.  Most other factors being equal, larger drives tend to equate to newer drives tend to equate to higher density platters which ~~ faster. 

 

I use a cache drive for fast xfers and if I'm not able to saturate my network because my cache drive is the limfac I'm not happy.  That is why my cache drive is a 640gb WD Black.  I know 640gb isn't "big", but WDB drives are indeed pretty fast.  It was also what i had sitting around 2-ish years ago.  If I didn't, you can be sure i would have gotten something similar (7200rpm with dense platters). 

 

Of course one other rason for a "big" cache drive is as a spare.  If it is the same size as your parity, or at least the largest data drive, then you have a spare drive sitting there ready to press into service in case of a failure while you source a good deal on a replacement.  That is as opposed to sourcing a replacement in a panic and taking whatever price you can get.

 

EDIT: oh and jsut to be clear, a 1TB SSD for a cache does just seem to be overkill.  IF you really want SSD, you can surely go smaller.  Do make sure you get one that does its own background garbage collection and TRIM, because UnRaid+RiserFS does not support it.  But really, any of the current modern larger drives, which are WAY cheaper, can saturate a GigE network.  And since money is no object, just use a 3 or 4 TB that matches your parity drive for cache.  It will be way fast enough and as already mentioned, have the added benefit of acting as a warm spare.

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Yea same here I just got a 600GB WD Velociraptor (quite large) for the cache drive, but it was on sale for $100 so I couldn't pass it up. Very nice drive. It hits my max potential writing from my 840 Pro in my computer to the Array over a Gigabit network without breaking a sweat.

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I use a 3TB drive as my cache drive. It acts as a warm spare.

 

One disadvantage of using a spare drive as cache is that you still have to run a lengthy preclear before it can be put into service.

 

It would be ideal if you could keep a precleared drive sitting on the shelf (or installed, but unassigned), ready to be put into service at a moment's notice.

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I use a 3TB drive as my cache drive. It acts as a warm spare.

 

One disadvantage of using a spare drive as cache is that you still have to run a lengthy preclear before it can be put into service.

 

It would be ideal if you could keep a precleared drive sitting on the shelf (or installed, but unassigned), ready to be put into service at a moment's notice.

 

This is one reason why I have always wished for better USB support. You would never want to put a disk into service with USB but its a port you never run out of.

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