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Very slow Reshape
Hi, I have an external cabinet with 3 disks (EDA500), added a 4th, and now the reshape has begun. but its slow as hell. 15618353664 blocks super 1.2 level 5, 64k chunk, algorithm 2 [4/4] [UUUU]...
mdgm wrote:
Those are high capacity disks. I think the resync time is reasonable for the EDA500.
At 13 MB/sec, it will take about a week to resync. Since performance stalls during the resync, and if anything goes wrong during the week there is risk of data loss.
Even if that's the best the system can do, from a user perspective it isn't great.
Granted the port multiplier will constrain performance, but 13 MB/sec does seem very slow when you are taking about disks that are at least 10x faster than that.
Hi,
The disks are 8TB WD Red,
I can understand that performance is a bit slower on the external port, but 13-15mb/sec? thats almost floppy-speed :)
// T
Those are high capacity disks. I think the resync time is reasonable for the EDA500.
mdgm wrote:
Those are high capacity disks. I think the resync time is reasonable for the EDA500.
At 13 MB/sec, it will take about a week to resync. Since performance stalls during the resync, and if anything goes wrong during the week there is risk of data loss.
Even if that's the best the system can do, from a user perspective it isn't great.
Granted the port multiplier will constrain performance, but 13 MB/sec does seem very slow when you are taking about disks that are at least 10x faster than that.
I think I may have some issues with one of the disks: I did find this.
It might explain why the rebuild is very slow.
[Mon Aug 22 14:05:29 2016] ata7.04: status: { DRDY }
[Mon Aug 22 14:05:29 2016] ata7.05: exception Emask 0x100 SAct 0x0 SErr 0x0 action 0x6 frozen
[Mon Aug 22 14:05:29 2016] ata7.15: hard resetting link
[Mon Aug 22 14:05:31 2016] ata7.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[Mon Aug 22 14:05:31 2016] ata7.15: PMP revalidation failed (errno=-19)
[Mon Aug 22 14:05:36 2016] ata7.15: hard resetting link
[Mon Aug 22 14:05:38 2016] ata7.15: SATA link up 3.0 Gbps (SStatus 123 SControl 0)
[Mon Aug 22 14:05:38 2016] ata7.00: hard resetting link
[Mon Aug 22 14:05:38 2016] ata7.00: SATA link up 3.0 Gbps (SStatus 123 SControl 320)
[Mon Aug 22 14:05:38 2016] ata7.01: hard resetting link
[Mon Aug 22 14:05:39 2016] ata7.01: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[Mon Aug 22 14:05:39 2016] ata7.02: hard resetting link
[Mon Aug 22 14:05:39 2016] ata7.02: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[Mon Aug 22 14:05:39 2016] ata7.03: hard resetting link
[Mon Aug 22 14:05:39 2016] ata7.03: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[Mon Aug 22 14:05:39 2016] ata7.04: hard resetting link
[Mon Aug 22 14:05:40 2016] ata7.04: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
[Mon Aug 22 14:05:40 2016] ata7.05: hard resetting link
[Mon Aug 22 14:05:40 2016] ata7.05: SATA link up 1.5 Gbps (SStatus 113 SControl 320)
[Mon Aug 22 14:05:40 2016] ata7.00: configured for UDMA/100
[Mon Aug 22 14:05:40 2016] ata7.01: configured for UDMA/100
[Mon Aug 22 14:05:40 2016] ata7.02: configured for UDMA/100
[Mon Aug 22 14:05:40 2016] ata7.03: configured for UDMA/100
[Mon Aug 22 14:05:40 2016] ata7.04: configured for UDMA/100
[Mon Aug 22 14:05:40 2016] ------------[ cut here ]------------
[Mon Aug 22 14:05:40 2016] WARNING: CPU: 2 PID: 866 at drivers/ata/libata-eh.c:3985 ata_eh_finish+0xbb/0xc0()
[Mon Aug 22 14:05:40 2016] Modules linked in: sx8635(O) vpd(PO)
[Mon Aug 22 14:05:40 2016] CPU: 2 PID: 866 Comm: scsi_eh_6 Tainted: P W O 4.1.21.x86_64.1 #1
[Mon Aug 22 14:05:40 2016] Hardware name: NETGEAR ReadyNAS 316 /ReadyNAS 316 , BIOS 4.6.5 03/23/2013
[Mon Aug 22 14:05:40 2016] 0000000000000000 ffff88007bc8fbf8 ffffffff889bfc1a 0000000000000000
[Mon Aug 22 14:05:40 2016] ffffffff88c6f46f ffff88007bc8fc38 ffffffff8806867d ffff88007bc8fc38
[Mon Aug 22 14:05:40 2016] 0000000000000020 ffff88007bea0000 0000000000000001 ffff88007bea0000
[Mon Aug 22 14:05:40 2016] Call Trace:
[Mon Aug 22 14:05:40 2016] [<ffffffff889bfc1a>] dump_stack+0x4d/0x63
[Mon Aug 22 14:05:40 2016] [<ffffffff8806867d>] warn_slowpath_common+0x8d/0xd0
[Mon Aug 22 14:05:40 2016] [<ffffffff880686d5>] warn_slowpath_null+0x15/0x20
[Mon Aug 22 14:05:40 2016] [<ffffffff885f8dbb>] ata_eh_finish+0xbb/0xc0
[Mon Aug 22 14:05:40 2016] [<ffffffff885fb7e3>] sata_pmp_error_handler+0x673/0xb00
[Mon Aug 22 14:05:40 2016] [<ffffffff885edd20>] ? sata_std_hardreset+0x40/0x40
[Mon Aug 22 14:05:40 2016] [<ffffffff88603350>] ? sil24_pmp_attach+0x80/0x80
[Mon Aug 22 14:05:40 2016] [<ffffffff88602470>] ? sil24_pmp_hardreset+0x80/0x80
[Mon Aug 22 14:05:40 2016] [<ffffffff885ed720>] ? ata_link_online+0x70/0x70
[Mon Aug 22 14:05:40 2016] [<ffffffff886023d3>] sil24_error_handler+0x33/0x50
[Mon Aug 22 14:05:40 2016] [<ffffffff885f92d0>] ata_scsi_port_error_handler+0x510/0x8c0
[Mon Aug 22 14:05:40 2016] [<ffffffff885f9713>] ata_scsi_error+0x93/0xd0
[Mon Aug 22 14:05:40 2016] [<ffffffff885a8ec4>] scsi_error_handler+0xb4/0x560
[Mon Aug 22 14:05:40 2016] [<ffffffff885a8e10>] ? scsi_eh_get_sense+0x180/0x180
[Mon Aug 22 14:05:40 2016] [<ffffffff885a8e10>] ? scsi_eh_get_sense+0x180/0x180
[Mon Aug 22 14:05:40 2016] [<ffffffff88082624>] kthread+0xc4/0xe0
[Mon Aug 22 14:05:40 2016] [<ffffffff88082560>] ? __kthread_parkme+0x80/0x80
[Mon Aug 22 14:05:40 2016] [<ffffffff889c7c92>] ret_from_fork+0x42/0x70
[Mon Aug 22 14:05:40 2016] [<ffffffff88082560>] ? __kthread_parkme+0x80/0x80
[Mon Aug 22 14:05:40 2016] ---[ end trace 6cdec7c9369f62ce ]---
[Mon Aug 22 14:05:40 2016] ata7: EH completeMy guess is that one of the drives is about to die.
Maybe its time to fire up the old NAS and do some backup :)
// T
That could be it.
You definitely should backup your data regularly.
Best practice would be to test disks with e.g. SeaTools for SeaGate disks or WD Data LifeGuard Diagnostics for WD disks.
Do you see any SMART errors for any of the disks in the NAS web admin UI or in the logs?
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