Re: [OpenIndiana-discuss] Slow zfs writes
Ram Chander wrote: So it looks like re-distribution issue. Initially there were two Vdev with 24 disks ( disk 0-23 ) for close to year. After which which we added 24 more disks and created additional vdevs. The initial vdevs are filled up and so write speed declined. Now how to find files that are present in a Vdev or a disk. That way I can remove and re-copy back to distribute data. Any other way to solve this ? Please stick to one list or cross-post, multi-posting tends to waste responder's time. -- Ian. ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] Slow zfs writes
If you weren't having any issues with speed and they've progressively gotten worse, I'd look at dedup. If you're using dedup, you better make sure you've got 2.5GB RAM for every TB of unique data you have, otherwise you'll be swapping your dedup tables constantly and your read/write performance is going to die. On Mon, Feb 11, 2013 at 1:30 PM, Ian Collins i...@ianshome.com wrote: Ram Chander wrote: Hi, My OI box is expreiencing slow zfs writes ( around 30 times slower ). iostat reports below error though pool is healthy. This is happening in past 4 days though no change was done to system. Is the hard disks faulty ? Please help. Does iostat -xtcMn 10 show any anomalies such as long wait times or high %b? Your pool configuration is a bit odd, I assume this isn't a production system? -- Ian. __**_ OpenIndiana-discuss mailing list OpenIndiana-discuss@**openindiana.orgOpenIndiana-discuss@openindiana.org http://openindiana.org/**mailman/listinfo/openindiana-**discusshttp://openindiana.org/mailman/listinfo/openindiana-discuss -- Seconds to the drop, but it seems like hours. http://www.openmedia.ca https://robbiecrash.me ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] Slow zfs writes
On 02/11/2013 09:54 PM, Robbie Crash wrote: If you weren't having any issues with speed and they've progressively gotten worse, I'd look at dedup. If you're using dedup, you better make sure you've got 2.5GB RAM for every TB of unique data you have, otherwise you'll be swapping your dedup tables constantly and your read/write performance is going to die. Also always remember to tune zfs_arc_meta_limit if you have lots of dedup, since DDT entries count as metadata and by default the meta_limit is 1/4 of arc_c_max (which for machines with lots of DRAM is ramsize minus 1GG by default). Cheers, -- Saso ___ OpenIndiana-discuss mailing list OpenIndiana-discuss@openindiana.org http://openindiana.org/mailman/listinfo/openindiana-discuss
Re: [OpenIndiana-discuss] Slow zfs writes
I am going to offer to obvious advice... How full is your pool? Zpool performance degrades as the pool fills up and the tools don't tell you how close you are to the cliff -- you find the cliff on your own by falling off of it. As a rule of thumb, I keep production system less than 70% utilized. Here is a real life example. On a 14.5TB (configured) pool, I found the cliff with 250+GB still reported as free. The system continued to write to the pool but throughput dismal. Is your pool full? j. -Original Message- From: Ram Chander [mailto:ramqu...@gmail.com] Sent: Monday, February 11, 2013 4:48 AM To: Discussion list for OpenIndiana Subject: [OpenIndiana-discuss] Slow zfs writes Hi, My OI box is expreiencing slow zfs writes ( around 30 times slower ). iostat reports below error though pool is healthy. This is happening in past 4 days though no change was done to system. Is the hard disks faulty ? Please help. # zpool status -v root@host:~# zpool status -v pool: test state: ONLINE status: The pool is formatted using a legacy on-disk format. The pool can still be used, but some features are unavailable. action: Upgrade the pool using 'zpool upgrade'. Once this is done, the pool will no longer be accessible on software that does not support feature flags. config: NAME STATE READ WRITE CKSUM test ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 c2t0d0 ONLINE 0 0 0 c2t1d0 ONLINE 0 0 0 c2t2d0 ONLINE 0 0 0 c2t3d0 ONLINE 0 0 0 c2t4d0 ONLINE 0 0 0 raidz1-1 ONLINE 0 0 0 c2t5d0 ONLINE 0 0 0 c2t6d0 ONLINE 0 0 0 c2t7d0 ONLINE 0 0 0 c2t8d0 ONLINE 0 0 0 c2t9d0 ONLINE 0 0 0 raidz1-3 ONLINE 0 0 0 c2t12d0 ONLINE 0 0 0 c2t13d0 ONLINE 0 0 0 c2t14d0 ONLINE 0 0 0 c2t15d0 ONLINE 0 0 0 c2t16d0 ONLINE 0 0 0 c2t17d0 ONLINE 0 0 0 c2t18d0 ONLINE 0 0 0 c2t19d0 ONLINE 0 0 0 c2t20d0 ONLINE 0 0 0 c2t21d0 ONLINE 0 0 0 c2t22d0 ONLINE 0 0 0 c2t23d0 ONLINE 0 0 0 raidz1-4 ONLINE 0 0 0 c2t24d0 ONLINE 0 0 0 c2t25d0 ONLINE 0 0 0 c2t26d0 ONLINE 0 0 0 c2t27d0 ONLINE 0 0 0 c2t28d0 ONLINE 0 0 0 c2t29d0 ONLINE 0 0 0 c2t30d0 ONLINE 0 0 0 raidz1-5 ONLINE 0 0 0 c2t31d0 ONLINE 0 0 0 c2t32d0 ONLINE 0 0 0 c2t33d0 ONLINE 0 0 0 c2t34d0 ONLINE 0 0 0 c2t35d0 ONLINE 0 0 0 c2t36d0 ONLINE 0 0 0 c2t37d0 ONLINE 0 0 0 raidz1-6 ONLINE 0 0 0 c2t38d0 ONLINE 0 0 0 c2t39d0 ONLINE 0 0 0 c2t40d0 ONLINE 0 0 0 c2t41d0 ONLINE 0 0 0 c2t42d0 ONLINE 0 0 0 c2t43d0 ONLINE 0 0 0 c2t44d0 ONLINE 0 0 0 spares c5t10d0AVAIL c5t11d0AVAIL c2t45d0AVAIL c2t46d0AVAIL c2t47d0AVAIL # iostat -En c4t0d0 Soft Errors: 0 Hard Errors: 5 Transport Errors: 0 Vendor: iDRACProduct: Virtual CD Revision: 0323 Serial No: Size: 0.00GB 0 bytes Media Error: 0 Device Not Ready: 5 No Device: 0 Recoverable: 0 Illegal Request: 1 Predictive Failure Analysis: 0 c3t0d0 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 Vendor: iDRACProduct: LCDRIVE Revision: 0323 Serial No: Size: 0.00GB 0 bytes Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 Illegal Request: 0 Predictive Failure Analysis: 0 c4t0d1 Soft Errors: 0 Hard Errors: 0 Transport Errors: 0 Vendor: iDRACProduct: Virtual Floppy Revision: 0323 Serial No: Size: 0.00GB 0 bytes Media Error: 0 Device Not Ready: 0 No Device: 0 Recoverable: 0 root@host:~# fmadm faulty --- -- - TIMEEVENT-ID MSG-ID SEVERITY --- -- - Jan 05 08:21:09 7af1ab3c-83c2-602d-d4b9
Re: [OpenIndiana-discuss] Slow zfs writes
So it looks like re-distribution issue. Initially there were two Vdev with 24 disks ( disk 0-23 ) for close to year. After which which we added 24 more disks and created additional vdevs. The initial vdevs are filled up and so write speed declined. Now how to find files that are present in a Vdev or a disk. That way I can remove and re-copy back to distribute data. Any other way to solve this ? Total capacity of pool - 98Tb Used - 44Tb Free - 54 Tb root@host:# zpool iostat -v capacity operationsbandwidth pool alloc free read write read write --- - - - - - - test 54.0T 62.7T 52 1.12K 2.16M 5.78M raidz1 11.2T 2.41T 13 30 176K 146K c2t0d0 - - 5 18 42.1K 39.0K c2t1d0 - - 5 18 42.2K 39.0K c2t2d0 - - 5 18 42.5K 39.0K c2t3d0 - - 5 18 42.9K 39.0K c2t4d0 - - 5 18 42.6K 39.0K raidz1 13.3T 308G 13100 213K 521K c2t5d0 - - 5 94 50.8K 135K c2t6d0 - - 5 94 51.0K 135K c2t7d0 - - 5 94 50.8K 135K c2t8d0 - - 5 94 51.1K 135K c2t9d0 - - 5 94 51.1K 135K raidz1 13.4T 19.1T 9455 743K 2.31M c2t12d0 - - 3137 69.6K 235K c2t13d0 - - 3129 69.4K 227K c2t14d0 - - 3139 69.6K 235K c2t15d0 - - 3131 69.6K 227K c2t16d0 - - 3141 69.6K 235K c2t17d0 - - 3132 69.5K 227K c2t18d0 - - 3142 69.6K 235K c2t19d0 - - 3133 69.6K 227K c2t20d0 - - 3143 69.6K 235K c2t21d0 - - 3133 69.5K 227K c2t22d0 - - 3143 69.6K 235K c2t23d0 - - 3133 69.5K 227K raidz1 2.44T 16.6T 5103 327K 485K c2t24d0 - - 2 48 50.8K 87.4K c2t25d0 - - 2 49 50.7K 87.4K c2t26d0 - - 2 49 50.8K 87.3K c2t27d0 - - 2 49 50.8K 87.3K c2t28d0 - - 2 49 50.8K 87.3K c2t29d0 - - 2 49 50.8K 87.3K c2t30d0 - - 2 49 50.8K 87.3K raidz1 8.18T 10.8T 5295 374K 1.54M c2t31d0 - - 2131 58.2K 279K c2t32d0 - - 2131 58.1K 279K c2t33d0 - - 2131 58.2K 279K c2t34d0 - - 2132 58.2K 279K c2t35d0 - - 2132 58.1K 279K c2t36d0 - - 2133 58.3K 279K c2t37d0 - - 2133 58.2K 279K raidz1 5.42T 13.6T 5163 383K 823K c2t38d0 - - 2 61 59.4K 146K c2t39d0 - - 2 61 59.3K 146K c2t40d0 - - 2 61 59.4K 146K c2t41d0 - - 2 61 59.4K 146K c2t42d0 - - 2 61 59.3K 146K c2t43d0 - - 2 62 59.2K 146K c2t44d0 - - 2 62 59.3K 146K On Tue, Feb 12, 2013 at 6:39 AM, Jason Matthews ja...@broken.net wrote: I am going to offer to obvious advice... How full is your pool? Zpool performance degrades as the pool fills up and the tools don't tell you how close you are to the cliff -- you find the cliff on your own by falling off of it. As a rule of thumb, I keep production system less than 70% utilized. Here is a real life example. On a 14.5TB (configured) pool, I found the cliff with 250+GB still reported as free. The system continued to write to the pool but throughput dismal. Is your pool full? j. -Original Message- From: Ram Chander [mailto:ramqu...@gmail.com] Sent: Monday, February 11, 2013 4:48 AM To: Discussion list for OpenIndiana Subject: [OpenIndiana-discuss] Slow zfs writes Hi, My OI box is expreiencing slow zfs writes ( around 30 times slower ). iostat reports below error though pool is healthy. This is happening in past 4 days though no change was done to system. Is the hard disks faulty ? Please help. # zpool status -v root@host:~# zpool status -v pool: test state: ONLINE status: The pool is formatted using a legacy on-disk format. The pool can still be used, but some features are unavailable. action: Upgrade the pool using 'zpool upgrade'. Once this is done, the pool will no longer be accessible on software that does not support feature flags. config: NAME STATE READ WRITE CKSUM test ONLINE 0 0 0 raidz1-0 ONLINE 0 0 0 c2t0d0 ONLINE 0 0 0 c2t1d0 ONLINE
