I would've replied to this thread but I don't see any options to reply.https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/ReadyNAS-4312X-Initial-Sync-Incredibly-Slow/td-p/1312492 When I try to use blockdev I get an error that says: -bash: blockdev: command not found What am I missing here?

RealityDev wrote: I'm assuming this would give me some kind of report I could give to WD to get a replacement for a defective drive? WD will give you a recertified replacement (1 year warranty). So return it to the seller if you can - that way you'll get a new drive with the full warranty. As far as documentation goes, just telling WD that it failed lifeguard is enough. They of course reserve the right to test the returned disk themselves - but neither Seagate nor WD have ever challenged one of my returns.

When I was running some expansion experiments, I, too, found RAID1 sync to be incredibly slow. It takes less time for a sync of a RAID5 than for a RAID1 with drives of the same size. I speculated it had something to do with read/write collisions on a single drive, but I didn't have a lot to go on in making that speculation.

RealityDev wrote: When I try to use blockdev I get an error that says: -bash: blockdev: command not found It's on my RN202 (and my RN526) root@RN202:~# which blockdev /sbin/blockdev What firmware are you running? Are you logging in as root? RealityDev wrote: https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/ReadyNAS-4312X-Initial-Sync-Incredibly-Slow/td-p/1312492 Of course using the tips there is at your own risk. I wouldn't disable NCQ myself. All the posts I'm seeing that suggest that are quite old, and seem to target hardware controllers (not software RAID). I don't have any experience in tuning read-ahead - so if I changed that during sync, I'd change it back to the original value when it is done. You can see that value with blockdev --getra /dev/md127

The firmware version is 6.10.0 and logging in as root allowed me to change the settings. However it doesn't seem like the settings make any difference, it's still ultra slow at over 140 hours to sync a 4TB mirrored RAID. I can't believe Netgear does not optimize the device to sync faster than this, people are okay with taking a week or more to do something that should take less than a day?

Can you use get_disk_info to see if there are errors on disks

RAID 1 resync incredibly slow | NETGEAR Communities

37 Replies

Replies have been turned off for this discussion

StephenB
Guru - Experienced User
May 20, 2019
RealityDev wrote:

When I try to use blockdev I get an error that says:

-bash: blockdev: command not found

It's on my RN202 (and my RN526)

root@RN202:~# which blockdev /sbin/blockdev

What firmware are you running? Are you logging in as root?

RealityDev wrote:

https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/ReadyNAS-4312X-Initial-Sync-Incredibly-Slow/td-p/1312492

Of course using the tips there is at your own risk.

I wouldn't disable NCQ myself. All the posts I'm seeing that suggest that are quite old, and seem to target hardware controllers (not software RAID).

I don't have any experience in tuning read-ahead - so if I changed that during sync, I'd change it back to the original value when it is done. You can see that value with blockdev --getra /dev/md127
- RealityDev
  Aspirant
  May 20, 2019
  The firmware version is 6.10.0 and logging in as root allowed me to change the settings. However it doesn't seem like the settings make any difference, it's still ultra slow at over 140 hours to sync a 4TB mirrored RAID. I can't believe Netgear does not optimize the device to sync faster than this, people are okay with taking a week or more to do something that should take less than a day?
  - StephenB
    Guru - Experienced User
    May 21, 2019
    RealityDev wrote:
    
    I can't believe Netgear does not optimize the device to sync faster than this, people are okay with taking a week or more to do something that should take less than a day?
    
    It shouldn't take a week for 2x4TB so I think something is wrong.
    
    What disks are you using (manufacturer and model)?
    
    Have you looked at the smart stats for both disks?
    
    # smartctl -x /dev/sda
    # smartctl -x /dev/sdb
    
    The -x will give you some data on recent failed commands, which I think is relevant here.
yxue
NETGEAR Expert
May 21, 2019
Can you use get_disk_info to see if there are errors on disks
- RealityDev
  Aspirant
  May 21, 2019
  Why are my replies being removed?
  - StephenB
    Guru - Experienced User
    May 21, 2019
    RealityDev wrote:
    
    Why are my replies being removed?
    
    There is an automated spam filter that might be kicking in. Mods should be looking in there periodically to release false positives - but if there is a flood of spam that isn't always practical. You can PM me if you have this problem, and I will release your post as soon as I can.
- RealityDev
  Aspirant
  May 21, 2019
  Disk info:
  
  root@nas1:~# get_disk_info
  Device: sda
  Controller: 0
  Channel: 0
  Model: WDC WD4000FYYZ-05UL1B0
  Serial: WD-WMC130D3C11E
  Firmware: 00.0NS05
  Class: SATA
  RPM: 7200
  Sectors: 7814037168
  Pool: data
  PoolType: RAID 1
  PoolState: 3
  PoolHostId: 405641b2
  Health data
  ATA Error Count: 0
  Reallocated Sectors: 0
  Reallocation Events: 0
  Spin Retry Count: 0
  Current Pending Sector Count: 0
  Uncorrectable Sector Count: 0
  Temperature: 41
  Start/Stop Count: 12
  Power-On Hours: 256
  Power Cycle Count: 12
  Load Cycle Count: 0
  
  Device: sdb
  Controller: 0
  Channel: 1
  Model: WDC WD4000FYYZ-05UL1B0
  Serial: WD-WCC13JSVRE5D
  Firmware: 00.0NS05
  Class: SATA
  RPM: 7200
  Sectors: 7814037168
  Pool: data
  PoolType: RAID 1
  PoolState: 3
  PoolHostId: 405641b2
  Health data
  ATA Error Count: 0
  Reallocated Sectors: 211
  Reallocation Events: 1
  Spin Retry Count: 0
  Current Pending Sector Count: 0
  Uncorrectable Sector Count: 0
  Temperature: 41
  Start/Stop Count: 36
  Power-On Hours: 257
  Power Cycle Count: 27
  Load Cycle Count: 12

Forum Discussion

RAID 1 resync incredibly slow

37 Replies

Related Content

X-Raid resync vs recovery

Degraded Resync???

ReadyNAS 4312X Initial Sync Incredibly Slow

I use x-raid (OS 6.9). I have 3 disks (raid 5). Can I change raid 5 to raid 1?

ReadyNAS 716X data- Two volumes after Resync

NETGEAR Academy

ProSupport for Business