March 25, 20233 yr Hi. I haven't paid attention to the log when pre-clearing an SSD.... but the pre/post read speeds are about what I would expect (consumer sata SK Hynix Gold S31 1Tb drive) but the actually zero-ing??? Wtf? Basically 30min > 80min>40min.... and it was complaining about temps (who'd complain about 69 ) 24-03-2023 02:40Unraid device dev3 temperatureAlert [EZRA] - device dev3 overheated (69 C)SHGS31-1000GS-2_FS0BN96451080C415 (dev3)alert 24-03-2023 01:08Unraid device dev3 temperatureAlert [EZRA] - device dev3 overheated (68 C)SHGS31-1000GS-2_FS0BN96451080C415 (dev3)alert But really I suppose my question is can that all be temperature? It went from 32 to 68 in about 25 mins of pre-read... I am trying to determine if the drive needs to be RMA'd or anything... its 15mos into a 5yr warranty period... Spoiler Mar 24 00:44:13 preclear_disk_FS0BN96451080C415_11175: Preclear Disk Version: 1.0.26 Mar 24 00:44:14 preclear_disk_FS0BN96451080C415_11175: Disk /dev/sdg is a SSD, disabling head stress test. Mar 24 00:44:14 preclear_disk_FS0BN96451080C415_11175: Disk size: 1000204886016 Mar 24 00:44:14 preclear_disk_FS0BN96451080C415_11175: Disk blocks: 244190646 Mar 24 00:44:14 preclear_disk_FS0BN96451080C415_11175: Blocks (512 bytes): 1953525168 Mar 24 00:44:14 preclear_disk_FS0BN96451080C415_11175: Block size: 4096 Mar 24 00:44:14 preclear_disk_FS0BN96451080C415_11175: Start sector: 256 Mar 24 00:44:15 preclear_disk_FS0BN96451080C415_11175: Pre-read: pre-read verification started 1 of 5 retries... Mar 24 00:52:15 preclear_disk_FS0BN96451080C415_11175: Pre-Read: progress - 25% read @ 532 MB/s Mar 24 00:59:52 preclear_disk_FS0BN96451080C415_11175: Pre-Read: progress - 50% read @ 532 MB/s Mar 24 01:07:43 preclear_disk_FS0BN96451080C415_11175: Pre-Read: progress - 75% read @ 530 MB/s Mar 24 01:15:28 preclear_disk_FS0BN96451080C415_11175: Pre-Read: elapsed time - 0:31:10 Mar 24 01:15:28 preclear_disk_FS0BN96451080C415_11175: Pre-read: pre-read verification completed! Mar 24 01:15:29 preclear_disk_FS0BN96451080C415_11175: Zeroing: zeroing the disk started 1 of 5 retries... Mar 24 01:15:29 preclear_disk_FS0BN96451080C415_11175: Zeroing: emptying the MBR. Mar 24 01:55:27 preclear_disk_FS0BN96451080C415_11175: Zeroing: progress - 25% zeroed @ 62 MB/s Mar 24 02:45:17 preclear_disk_FS0BN96451080C415_11175: Zeroing: progress - 50% zeroed @ 110 MB/s Mar 24 03:16:25 preclear_disk_FS0BN96451080C415_11175: Zeroing: progress - 75% zeroed @ 156 MB/s Mar 24 03:30:03 preclear_disk_FS0BN96451080C415_11175: Zeroing: progress - 100% zeroed @ 8 MB/s Mar 24 03:30:05 preclear_disk_FS0BN96451080C415_11175: Zeroing: zeroing the disk completed! Mar 24 03:30:06 preclear_disk_FS0BN96451080C415_11175: Signature: writing signature... Mar 24 03:30:07 preclear_disk_FS0BN96451080C415_11175: Signature: verifying Unraid's signature on the MBR ... Mar 24 03:30:08 preclear_disk_FS0BN96451080C415_11175: Signature: Unraid preclear signature is valid! Mar 24 03:30:08 preclear_disk_FS0BN96451080C415_11175: Post-Read: post-read verification started 1 of 5 retries... Mar 24 03:30:08 preclear_disk_FS0BN96451080C415_11175: Post-Read: verifying the beginning of the disk. Mar 24 03:30:09 preclear_disk_FS0BN96451080C415_11175: Post-Read: verifying the rest of the disk. Mar 24 03:40:58 preclear_disk_FS0BN96451080C415_11175: Post-Read: progress - 25% verified @ 394 MB/s Mar 24 03:51:27 preclear_disk_FS0BN96451080C415_11175: Post-Read: progress - 50% verified @ 393 MB/s Mar 24 04:02:05 preclear_disk_FS0BN96451080C415_11175: Post-Read: progress - 75% verified @ 388 MB/s Mar 24 04:12:37 preclear_disk_FS0BN96451080C415_11175: Post-Read: elapsed time - 0:42:26 Mar 24 04:12:37 preclear_disk_FS0BN96451080C415_11175: Post-Read: post-read verification completed! Mar 24 04:12:38 preclear_disk_FS0BN96451080C415_11175: Cycle: elapsed time: 3:28:24 Mar 24 04:12:38 preclear_disk_FS0BN96451080C415_11175: Preclear: total elapsed time: 3:28:24 Anyway insights appreciated! TIA -g p.s. That 8MB/s I am wondering if that is an average for the last 25% or just a instant-read? Edited March 25, 20233 yr by Garbonzo highlighted a few things
March 25, 20233 yr Sustained write speeds will be much lower due to quickly filing up the pseudo SLC cache, but those 8MB/s are an anomaly, just for the last few seconds, also note that you should really not preclear flash based devices, you can use blkdiscard if you want to wipe it.
March 26, 20233 yr Author 16 hours ago, JorgeB said: Sustained write speeds will be much lower due to quickly filing up the pseudo SLC cache, but those 8MB/s are an anomaly, just for the last few seconds, also note that you should really not preclear flash based devices, you can use blkdiscard if you want to wipe it. Thank you. And I am pretty sure I knew that about pre-clearing ssd drives, but this was one that wasn't mountable last week... and you helped me with the problem that turned out to be memory timing issues, so I was pretty sure the drive was fine, but wanted to use it as another pool for something else... just thought I would check with those that know more... thanks again for the assist. -g
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