HDRW

Strange result - kicked off the update to 6.12, came back later and rebooted, and the array came up as stopped (is this expected?). Pressed [Start] and it didn't - it showed all the data drives had "missing or invalid format", or words to that effect. All were XFS, and showed as such. Stopped the array, rebooted, started the array, and this time all drives came up OK. I wonder what happened?

OK, thanks for that - I'll see if I can swap things to eliminate the dodgy item. Cheers! Howard

OK, here it is: root@uServer1:~# smartctl -a /dev/sdb smartctl 7.0 2018-12-30 r4883 [x86_64-linux-4.19.98-Unraid] (local build) Copyright (C) 2002-18, Bruce Allen, Christian Franke, www.smartmontools.org === START OF INFORMATION SECTION === Device Model: TOSHIBA HDWQ140 Serial Number: X9GBK1LEFBJG LU WWN Device Id: 5 000039 99bc010c0 Firmware Version: FJ1M User Capacity: 4,000,787,030,016 bytes [4.00 TB] Sector Size: 512 bytes logical/physical Rotation Rate: 7200 rpm Form Factor: 3.5 inches Device is: Not in smartctl database [for details use: -P showall] ATA Version is: ATA8-ACS (minor revision not indicated) SATA Version is: SATA 3.0, 6.0 Gb/s (current: 3.0 Gb/s) Local Time is: Wed Feb 26 20:36:29 2020 GMT SMART support is: Available - device has SMART capability. SMART support is: Enabled === START OF READ SMART DATA SECTION === SMART overall-health self-assessment test result: PASSED General SMART Values: Offline data collection status: (0x82) Offline data collection activity was completed without error. Auto Offline Data Collection: Enabled. Self-test execution status: ( 0) The previous self-test routine completed without error or no self-test has ever been run. Total time to complete Offline data collection: ( 120) seconds. Offline data collection capabilities: (0x5b) SMART execute Offline immediate. Auto Offline data collection on/off support. Suspend Offline collection upon new command. Offline surface scan supported. Self-test supported. No Conveyance Self-test supported. Selective Self-test supported. SMART capabilities: (0x0003) Saves SMART data before entering power-saving mode. Supports SMART auto save timer. Error logging capability: (0x01) Error logging supported. General Purpose Logging supported. Short self-test routine recommended polling time: ( 2) minutes. Extended self-test routine recommended polling time: ( 455) minutes. SCT capabilities: (0x003d) SCT Status supported. SCT Error Recovery Control supported. SCT Feature Control supported. SCT Data Table supported. SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x000b 100 100 050 Pre-fail Always - 0 2 Throughput_Performance 0x0005 100 100 050 Pre-fail Offline - 0 3 Spin_Up_Time 0x0027 100 100 001 Pre-fail Always - 7394 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 2 5 Reallocated_Sector_Ct 0x0033 100 100 050 Pre-fail Always - 0 7 Seek_Error_Rate 0x000b 100 100 050 Pre-fail Always - 0 8 Seek_Time_Performance 0x0005 100 100 050 Pre-fail Offline - 0 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 125 10 Spin_Retry_Count 0x0033 100 100 030 Pre-fail Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 2 191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0 192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 0 193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 133 194 Temperature_Celsius 0x0022 100 100 000 Old_age Always - 28 (Min/Max 11/42) 196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always - 0 197 Current_Pending_Sector 0x0032 100 100 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 220 Disk_Shift 0x0002 100 100 000 Old_age Always - 0 222 Loaded_Hours 0x0032 100 100 000 Old_age Always - 125 223 Load_Retry_Count 0x0032 100 100 000 Old_age Always - 0 224 Load_Friction 0x0022 100 100 000 Old_age Always - 0 226 Load-in_Time 0x0026 100 100 000 Old_age Always - 637 240 Head_Flying_Hours 0x0001 100 100 001 Pre-fail Offline - 0 SMART Error Log Version: 1 No Errors Logged SMART Self-test log structure revision number 1 Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error # 1 Extended offline Completed without error 00% 81 - # 2 Short offline Completed without error 00% 44 - SMART Selective self-test log data structure revision number 1 SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS 1 0 0 Not_testing 2 0 0 Not_testing 3 0 0 Not_testing 4 0 0 Not_testing 5 0 0 Not_testing Selective self-test flags (0x0): After scanning selected spans, do NOT read-scan remainder of disk. If Selective self-test is pending on power-up, resume after 0 minute delay. Cheers, Howard

Thanks for your help. I'm sure it's not a temperature problem - where it is makes this pretty-much impossible! I ran the Preclear again, this time starting with the Erase, which ran OK (taking about 24hrs) and then zeroing. I last saw the log with less than 10% remaining of the Zeroing, at about 12:00 today. When I came back for a look this evening, the drive had vanished from the Main screen, so I couldn't get to its own log, but the main log showed this (there wasn't anything before this): ===================== Feb 26 12:26:19 uServer1 kernel: sd 1:0:0:0: [sdb] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 Feb 26 12:26:19 uServer1 kernel: sd 1:0:0:0: [sdb] tag#0 CDB: opcode=0x88 88 00 00 00 00 00 00 f7 e0 00 00 00 08 00 00 00 Feb 26 12:26:19 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 16244736 Feb 26 12:26:19 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 16242688 Feb 26 12:26:19 uServer1 kernel: Buffer I/O error on dev sdb, logical block 2030336, async page read Feb 26 12:26:19 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 16242688 Feb 26 12:26:19 uServer1 kernel: Buffer I/O error on dev sdb, logical block 2030336, async page read Feb 26 12:26:19 uServer1 rc.diskinfo[7387]: SIGHUP received, forcing refresh of disks info. Feb 26 12:26:19 uServer1 kernel: usb 8-2: new SuperSpeed Gen 1 USB device number 3 using xhci_hcd Feb 26 12:26:19 uServer1 kernel: usb 8-2: language id specifier not provided by device, defaulting to English Feb 26 12:26:19 uServer1 kernel: usb-storage 8-2:1.0: USB Mass Storage device detected Feb 26 12:26:19 uServer1 kernel: scsi host1: usb-storage 8-2:1.0 Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd - read 8316256256 of 4000787030016. Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd command failed, exit code [1]. Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 10+0 records in Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 9+0 records out Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 18874368 bytes (19 MB, 18 MiB) copied, 0.234822 s, 80.4 MB/s Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 1102+0 records in Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 1101+0 records out Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 2308964352 bytes (2.3 GB, 2.2 GiB) copied, 12.1095 s, 191 MB/s Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 2263+0 records in Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 2262+0 records out Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 4743757824 bytes (4.7 GB, 4.4 GiB) copied, 24.7798 s, 191 MB/s Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 3453+0 records in Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 3452+0 records out Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 7239368704 bytes (7.2 GB, 6.7 GiB) copied, 37.7141 s, 192 MB/s Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: dd: error reading '/dev/sdb': Input/output error Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 3964+1 records in Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 3964+1 records out Feb 26 12:26:21 uServer1 preclear_disk_0123456789000000005[1943]: Post-Read: dd output: 8314159104 bytes (8.3 GB, 7.7 GiB) copied, 43.4195 s, 191 MB/s Feb 26 12:26:23 uServer1 preclear_disk_0123456789000000005[1943]: error encountered, exiting... Feb 26 12:26:26 uServer1 kernel: mdcmd (72): spindown 2 Feb 26 12:26:41 uServer1 kernel: usb 8-2: reset SuperSpeed Gen 1 USB device number 3 using xhci_hcd Feb 26 12:29:58 uServer1 kernel: mdcmd (73): spindown 3 Feb 26 12:37:00 uServer1 kernel: mdcmd (74): spindown 0 Feb 26 13:49:30 uServer1 kernel: mdcmd (75): spindown 0 Feb 26 14:14:41 uServer1 kernel: mdcmd (76): spindown 0 Feb 26 14:14:53 uServer1 kernel: mdcmd (77): spindown 1 Feb 26 19:37:16 uServer1 emhttpd: cmd: /usr/local/emhttp/plugins/dynamix/scripts/disk_log sdc ===================== So it looks like the failure occurred at about the end of Zeroing (given the time). I rebooted and the drive reappeared, showing "precleared" but with the Format button inoperative, as before. So it does look like something is causing the USB/SATA dock to fail, but it got through erasing and only failed at about the same point during Zeroing. I'm a bit lost for ideas! Cheers, Howard

(I posted this in General originally, not realising it should be here - sorry"!) I've got a brand-new Toshiba X300 "NAS" 4TB drive that I want to swap-in to replace a 2TB data disk in my array (the Parity drive is already 4TB) but I'm having trouble with the "Preclear" function, accessed by pressing "Start Preclear" under "Unassigned Devices" on the Main page... As my hardware doesn't have any spare SATA ports, I have the new drive connected to a USB3 "Drive Dock", where the disk plugs into a slot in the top and connects to a SATA connector at the bottom of the slot. Seems to work fine... I did a Preclear with the Pre-read set Off (it's a new disk, no SMART problems, zero power-on hours showing when I started using it, so I assumed pre-read was not going to do anything useful). The Zeroing went well, but during Post-Read something happened at some point after 75% - see below for the messages that popped up as it went: ================================================= Preclear on 0123456789000000005: 22-02-2020 09:14 Zeroing started on 0123456789000000005 (sdb) Zeroing started on 0123456789000000005 (sdb). Cycle 1 of 1. Preclear on 0123456789000000005: 22-02-2020 16:16 Zeroing finished on 0123456789000000005 (sdb) Zeroing finished on 0123456789000000005 (sdb). Cycle 1 of 1. Preclear on 0123456789000000005: 22-02-2020 16:16 Post-Read started on 0123456789000000005 (sdb) Post-Read started on 0123456789000000005 (sdb). Cycle 1 of 1. Preclear on 0123456789000000005: 22-02-2020 17:44 Post-Read in progress on 0123456789000000005 (sdb) Post-Read in progress on 0123456789000000005 (sdb): 25% @ 181. Temp: 41 C. Cycle 1 of 1. Preclear on 0123456789000000005: 22-02-2020 19:21 Post-Read in progress on 0123456789000000005 (sdb) Post-Read in progress on 0123456789000000005 (sdb): 50% @ 165. Temp: 40 C. Cycle 1 of 1. Preclear on 0123456789000000005: 22-02-2020 21:11 Post-Read in progress on 0123456789000000005 (sdb) Post-Read in progress on 0123456789000000005 (sdb): 75% @ 136. Temp: 39 C. Cycle 1 of 1. Preclear on 0123456789000000005: 22-02-2020 22:15 FAIL! Post-Read 0123456789000000005 (/dev/sdb) failed FAIL! Post-Read 0123456789000000005 (/dev/sdb) failed =================================================== What's going on? The SMART data is still all OK, but the "Format" button doesn't operate, the only thing I can do is to try another Preclear, but given the time it takes I'd like to know why it failed rather than just "trying it again to see what happens"! The log file, from the Preclear starting, is as follows: ============ Feb 22 09:14:14 uServer1 preclear_disk_0123456789000000005[15731]: Command: /usr/local/emhttp/plugins/preclear.disk/script/preclear_disk.sh --notify 1 --frequency 4 --cycles 1 --skip-preread --no-prompt /dev/sdb Feb 22 09:14:21 uServer1 kernel: sd 1:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16). Feb 22 09:14:21 uServer1 kernel: sd 1:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16). Feb 22 09:14:21 uServer1 preclear_disk_0123456789000000005[15731]: Zeroing: dd if=/dev/zero of=/dev/sdb bs=2097152 seek=2097152 count=4000784932864 conv=notrunc iflag=count_bytes,nocache,fullb Feb 22 16:16:12 uServer1 kernel: sd 1:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16). Feb 22 16:16:15 uServer1 kernel: sd 1:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16). Feb 22 16:16:18 uServer1 preclear_disk_0123456789000000005[15731]: Post-Read: cmp /tmp/.preclear/sdb/fifo /dev/zero Feb 22 16:16:18 uServer1 preclear_disk_0123456789000000005[15731]: Post-Read: dd if=/dev/sdb of=/tmp/.preclear/sdb/fifo count=2096640 skip=512 conv=notrunc iflag=nocache,count_bytes,skip_bytes Feb 22 16:16:19 uServer1 preclear_disk_0123456789000000005[15731]: Post-Read: cmp /tmp/.preclear/sdb/fifo /dev/zero Feb 22 16:16:20 uServer1 preclear_disk_0123456789000000005[15731]: Post-Read: dd if=/dev/sdb of=/tmp/.preclear/sdb/fifo bs=2097152 skip=2097152 count=4000784932864 conv=notrunc iflag=nocache,count_bytes,skip_bytes Feb 22 22:15:01 uServer1 kernel: sd 1:0:0:0: [sdb] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 Feb 22 22:15:01 uServer1 kernel: sd 1:0:0:0: [sdb] tag#0 CDB: opcode=0x88 88 00 00 00 00 01 95 f0 f0 00 00 00 08 00 00 00 Feb 22 22:15:01 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 6810562560 Feb 22 22:15:01 uServer1 kernel: sd 1:0:0:0: [sdb] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 Feb 22 22:15:01 uServer1 kernel: sd 1:0:0:0: [sdb] tag#0 CDB: opcode=0x88 88 00 00 00 00 01 95 f0 f8 00 00 00 08 00 00 00 Feb 22 22:15:01 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 6810564608 Feb 22 22:15:01 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 0 Feb 22 22:15:01 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 1860881286 Feb 22 22:15:01 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 672538168 Feb 22 22:15:01 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 7814037167 Feb 22 22:15:01 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 1372338735 Feb 22 22:15:01 uServer1 kernel: print_req_error: I/O error, dev sdb, sector 6810562560 Feb 22 22:15:01 uServer1 kernel: Buffer I/O error on dev sdb, logical block 851320320, async page read Feb 22 22:15:03 uServer1 kernel: sd 1:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16). Feb 22 22:15:03 uServer1 kernel: sd 1:0:0:0: [sdb] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB) Feb 22 22:15:03 uServer1 kernel: sd 1:0:0:0: [sdb] Write Protect is off Feb 22 22:15:03 uServer1 kernel: sd 1:0:0:0: [sdb] Mode Sense: 03 00 00 00 Feb 22 22:15:03 uServer1 kernel: sd 1:0:0:0: [sdb] No Caching mode page found Feb 22 22:15:03 uServer1 kernel: sd 1:0:0:0: [sdb] Assuming drive cache: write through Feb 22 22:15:03 uServer1 kernel: sd 1:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16). Feb 22 22:15:03 uServer1 kernel: sdb: sdb1 Feb 22 22:15:03 uServer1 kernel: sd 1:0:0:0: [sdb] Very big device. Trying to use READ CAPACITY(16). Feb 22 22:15:03 uServer1 kernel: sd 1:0:0:0: [sdb] Attached SCSI disk Feb 22 22:15:04 uServer1 preclear_disk_0123456789000000005[15731]: Post-Read: dd output: dd: error reading '/dev/sdb': Input/output error Feb 22 22:15:04 uServer1 unassigned.devices: Adding disk '/dev/sdb1'... Feb 22 22:15:04 uServer1 unassigned.devices: Mount drive command: /sbin/mount -t precleared -o rw,auto,async,noatime,nodiratime '/dev/sdb1' '/mnt/disks/TOSHIBA_HDWQ140' Feb 22 22:15:04 uServer1 unassigned.devices: Mount of '/dev/sdb1' failed. Error message: mount: /mnt/disks/TOSHIBA_HDWQ140: unknown filesystem type 'precleared'. =================== I have no idea that UNKNOWN (0x2003) means, and it's weird that it suddenly threw errors on apparently random sectors at 22:15:01 - does this suggest anything? Thanks for any help/advice! Cheers, Howard

The best thing is the ability to have mixed drive-sizes, with specific drives being visible individually, so I can upgrade drives one at a time and keep the system running while it rebuilds the new, increased-size, drive. The thing I'd like to see added is more support for external drives, using FireWire, USB 3 etc. So I can have fast access to drives that aren't in the array but need to be network-accessible.

And finally... it took 21 hours to preclear (including pre- and post-read) a Toshiba N300 ("NAS") 4TB drive in the USB 3.0 Dock. Now to install it as the Parity drive! Cheers, Howard

Ta - Done!

Well I couldn't get eSATA to work (I suspect a power problem) , so I went with a USB 3.0 PCI-Express card in the machine, and a USB 3.0 Docking station (where the drive plugs in from the top) which has its own power supply. It shows the drive correctly as 4TB and the preclear is now running along nicely at a tad over 200MB/sec, so I think I can confirm that my first USB-SATA adaptor is duff, and my USB 2 dock only handles 2TB! Thanks for all the advice, folks. (I can't see how to add "SOLVED" to the title, or I'd do that)

Well after 48 hours it crapped out entirely, so I suspect the USB-SATA adaptor is faulty. Tried again using a USB "dock" where the drive plugs into the top, and it went much faster (20MB/Sec) but it only showed the 4TB drive as 2TB - may be a limit of this dock, so I'm now waiting for a USB 3.0 - SATA adaptor to turn up. Incidentally, this server has an eSATA port - would that be expected to work with UnRAID? Cheers, Howard

I'm going to updrade my array by initially going to a 4TB Parity drive (from 2TB) and then upping some data disks. My server is full, with 4 SATA drives, so I thought I'd PreClear the 4TB disk using a USB-SATA adaptor (USB 2). Connected up, started the PreClear tool, and started it running with no changes to the parameters (Pre- and Post-Read set to happen). That was yesterday... So far it's reading: Pre-Read: 1% @ 0 MB/s (21:41:39) Nearly 22 hours to do 1%! Is this the expected speed using USB 2, or is there something else happening? I need this to finish well before Christmas, but at this rate it won't even have finished the Pre-Read by then... The only other options I have are to use eSATA (don't have the cable for this) or to get a 30-day trial of UnRAID and fire up another machine with it, connect this drive internally, and use that for the preclear, which is quite a bit of hassle (I need to find a suitable machine first). Any thoughts/advice, please? Cheers, Howard

So, to be clear, you have all the data from the current ReiserFS drive backed up elsewhere, and you want to put the new drive into that slot with a blank XFS format and copy the data back? Well this array *is* the backup for others, so I do have the originals, but I didn't want to copy over the network, but between disks on the UnRAID - it still took several hours using rsync. Yes, but I found last time I wanted to do this (replace a disk and change the format) that the instructions in that thread don't work with the current (6.2.4) version of UnRAID. I've found that the Wiki doesn't cover what I want to do (twice so far, one more to do at some point!) - to pre-clear a new disk, then format it using XFS, then to copy over the data from the Reiser-formatted disk, then swap the latter out for the former. Seems that it is pretty tricky without it trying to recreate the Parity at least once, and if you're not careful, a couple of times. There was a period this time when I was running without valid Parity, but probably for less time than it takes to recreate it. It's done this time, but it would be nice to know if there's a better way next time. Cheers, Howard

OK, back again... Well, for "good long time", read "about seven weeks"! :-) I recently got a (rare) bargain on eBay - a Used 2TB WD Re "Enterprise" drive for a good price, and it turned out to be only a few months old, and SMART reports it had only 39 power-on hours! (Wish they'd had more than one...). I want to swap it in, replacing a drive that's showing some problems (3 reallocated sectors, 419 errors on the main page) and formatting it as XFS (Reiser is current on the existing drive). Due to changing the format I don't want to follow the "replace a failed drive" procedure. I connected it up, and ran the "Pre-Clear" add-on which took 9 hours. It's now shown in "Unassigned" as Precleared, and it has "Format" to the left of the Temp column, but it doesn't have a button surround, and clicking it causes a green surround to appear while the button is held down, but nothing happens. Is this a bug in 6.2.4? How do I format it? I'd rather not add it to the array at this point in case it triggers a Parity Check which isn't necessary at this point, and puts unnecessary wear on the Parity disk - judging from my earlier experiences, it will be necessary to do a full Parity Check/generation when I swap the drive in anyway. Cheers, Howard

(I know you didn't point me to those instructions, which is why my comment followed the quote from Johnnie's message ) Anyway, thanks - I've gone with number 3, a New Config without known-good Parity, placed the drives as I want them (new drive in, old drive out), and restarted, and it's now rebuilding Parity (another 15 hours!). I wasn't actually doing a cascade of changes of format, the primary objective was to replace a slow (5400rpm) drive with a fast (7200) one, and changing to XFS on the new one was - I thought - a "free" bonus! I realise I could have just done the "failed drive replacement" procedure, but that would have continued with ReiserFS on the new disk, which seemed to be a wasted opportunity. I still don't understand why features come and go (especially go!) between versions - the absence of clearing while the array is started in 6.1 prompted me to update to 6.2, unaware of the problem with swapping slots. It seems to me that RobJ's instructions can't work as laid out, since it seems to rely on features that don't all exist in any one UnRAID version! I may post a warning on that thread. Thinking about it, the disk slots don't all have to be occupied, so I could have just unassigned Disk 1 after copying over, but then all my machines would have to have their access changed from Disk1 to Disk4, and having the physical slots not match the numbers in the software just feels wrong. Anyway, I think I'm now sorted out - I'm not going to touch the thing again for a good long time now! Thanks for all your help - I could probably have perpetrated a disaster without it... Cheers, Howard

Arrrggh! So why did you point me to those instructions? I updated to 6.2 because 6.1 wouldn't do a Clear with the array started, and now I'm stuck! @garycase: I haven't found any reference to the Global User Share Bug that you've mentioned, at least on page 26 of that thread, but I have both Disk and User shares turned Off in Global Share Settings, so hopefully that's OK. Steps I followed: 1. Changed the default format to XFS 2. Stopped the array and powered down, plugged-in the new drive. Restarted. 3. Per my thread: https://lime-technology.com/forum/index.php?topic=52948.msg508922#msg508922 I updated to 6.2.1 as 6.1 wouldn't clear the new drive (it wouldn't do anything to it). 4. After the update the new disk was assigned as Disk 4, and Cleared (about 15 hours). 5. Formatted the new disk (as XFS). 6. Following RobJ's item 8: Accessed the server via SSH and ran: rsync -avPX /mnt/disk1/ /mnt/disk4/ which ran for many hours (at least 15). I'd decided not to remove the source files - that seems like sawing through the branch you're sitting on... 7. Following RobJ's item 9, ran: rsync -rcvPX /mnt/disk1/ /mnt/disk4 which ran without copying anything, so I think this proves a good copy. 8. Following RobJ's 10 to 13, swapped over the drives between Disk 1 and Disk 4, and changed their formats to match what they are (Disk 4 now ReiserFS, Disk 1 now XFS). Both now showing "Wrong" (see attached capture of the Main page at that time - I've sanitised the IP addresses). 9. Now can't Start the array due to "Too many wrong and/or missing disks!" - can't do anything on Main except reboot or power it down. How do I get my disks back? As far as I know I have all the data still there (two copies of the copied data) so where do I go from here? Should I go for a "New Config"? If so, what should I set for "Retain Configuration"? (I suspect "Parity slots", and then add in the drives in their new slots, but I'd like confirmation as this seems terribly dangerous!) Finally: Are the disk "slots" determined by physical location, or Disk ID? I haven't physically swapped Disk 4 into the Disk 1 slot, but I will do - should I do it before any further recovery, or is physical location irrelevant? Cheers, Howard HDRW.zip