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https://github.com/ceph/ceph
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135 lines
7.1 KiB
ReStructuredText
135 lines
7.1 KiB
ReStructuredText
=======================
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Zoned Storage Support
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=======================
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http://zonedstorage.io
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Zoned Storage is a class of storage devices that enables host and storage
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devices to cooperate to achieve higher storage capacities, increased throughput,
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and lower latencies. The zoned storage interface is available through the SCSI
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Zoned Block Commands (ZBC) and Zoned Device ATA Command Set (ZAC) standards on
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Shingled Magnetic Recording (SMR) hard disks today and is also being adopted for
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NVMe Solid State Disks with the upcoming NVMe Zoned Namespaces (ZNS) standard.
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This project aims to enable Ceph to work on zoned storage drives and at the same
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time explore research problems related to adopting this new interface. The
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first target is to enable non-ovewrite workloads (e.g. RGW) on host-managed SMR
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(HM-SMR) drives and explore cleaning (garbage collection) policies. HM-SMR
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drives are high capacity hard drives with the ZBC/ZAC interface. The longer
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term goal is to support ZNS SSDs, as they become available, as well as overwrite
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workloads.
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The first patch in these series enabled writing data to HM-SMR drives. This
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patch introduces ZonedFreelistManger, a FreelistManager implementation that
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passes enough information to ZonedAllocator to correctly initialize state of
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zones by tracking the write pointer and the number of dead bytes per zone. We
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have to introduce a new FreelistManager implementation because with zoned
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devices a region of disk can be in three states (empty, used, and dead), whereas
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current BitmapFreelistManager tracks only two states (empty and used). It is
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not possible to accurately initialize the state of zones in ZonedAllocator by
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tracking only two states. The third planned patch will introduce a rudimentary
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cleaner to form a baseline for further research.
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Currently we can perform basic RADOS benchmarks on an OSD running on an HM-SMR
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drives, restart the OSD, and read the written data, and write new data, as can
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be seen below.
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Please contact Abutalib Aghayev <agayev@cs.cmu.edu> for questions.
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::
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$ zbc_info /dev/sdc
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Device /dev/sdc:
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Vendor ID: ATA HGST HSH721414AL T240
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Zoned block device interface, Host-managed zone model
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27344764928 512-bytes sectors
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3418095616 logical blocks of 4096 B
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3418095616 physical blocks of 4096 B
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14000.520 GB capacity
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Read commands are unrestricted
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672 KiB max R/W size
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Maximum number of open sequential write required zones: 128
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$ MON=1 OSD=1 MDS=0 sudo ../src/vstart.sh --new --localhost --bluestore --bluestore-devs /dev/sdc --bluestore-zoned
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<snipped verbose output>
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$ sudo ./bin/ceph osd pool create bench 32 32
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pool 'bench' created
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$ sudo ./bin/rados bench -p bench 10 write --no-cleanup
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hints = 1
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Maintaining 16 concurrent writes of 4194304 bytes to objects of size 4194304 for up to 10 seconds or 0 objects
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Object prefix: benchmark_data_h0.cc.journaling712.narwhal.p_29846
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sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg lat(s)
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0 0 0 0 0 0 - 0
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1 16 45 29 115.943 116 0.384175 0.407806
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2 16 86 70 139.949 164 0.259845 0.391488
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3 16 125 109 145.286 156 0.31727 0.404727
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4 16 162 146 145.953 148 0.826671 0.409003
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5 16 203 187 149.553 164 0.44815 0.404303
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6 16 242 226 150.621 156 0.227488 0.409872
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7 16 281 265 151.384 156 0.411896 0.408686
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8 16 320 304 151.956 156 0.435135 0.411473
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9 16 359 343 152.401 156 0.463699 0.408658
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10 15 396 381 152.356 152 0.409554 0.410851
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Total time run: 10.3305
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Total writes made: 396
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Write size: 4194304
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Object size: 4194304
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Bandwidth (MB/sec): 153.333
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Stddev Bandwidth: 13.6561
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Max bandwidth (MB/sec): 164
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Min bandwidth (MB/sec): 116
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Average IOPS: 38
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Stddev IOPS: 3.41402
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Max IOPS: 41
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Min IOPS: 29
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Average Latency(s): 0.411226
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Stddev Latency(s): 0.180238
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Max latency(s): 1.00844
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Min latency(s): 0.108616
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$ sudo ../src/stop.sh
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$ # Notice the lack of "--new" parameter to vstart.sh
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$ MON=1 OSD=1 MDS=0 sudo ../src/vstart.sh --localhost --bluestore --bluestore-devs /dev/sdc --bluestore-zoned
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<snipped verbose output>
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$ sudo ./bin/rados bench -p bench 10 rand
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hints = 1
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sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg lat(s)
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0 0 0 0 0 0 - 0
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1 16 61 45 179.903 180 0.117329 0.244067
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2 16 116 100 199.918 220 0.144162 0.292305
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3 16 174 158 210.589 232 0.170941 0.285481
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4 16 251 235 234.918 308 0.241175 0.256543
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5 16 316 300 239.914 260 0.206044 0.255882
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6 15 392 377 251.206 308 0.137972 0.247426
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7 15 458 443 252.984 264 0.0800146 0.245138
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8 16 529 513 256.346 280 0.103529 0.239888
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9 16 587 571 253.634 232 0.145535 0.2453
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10 15 646 631 252.254 240 0.837727 0.246019
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Total time run: 10.272
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Total reads made: 646
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Read size: 4194304
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Object size: 4194304
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Bandwidth (MB/sec): 251.558
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Average IOPS: 62
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Stddev IOPS: 10.005
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Max IOPS: 77
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Min IOPS: 45
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Average Latency(s): 0.249385
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Max latency(s): 0.888654
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Min latency(s): 0.0103208
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$ sudo ./bin/rados bench -p bench 10 write --no-cleanup
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hints = 1
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Maintaining 16 concurrent writes of 4194304 bytes to objects of size 4194304 for up to 10 seconds or 0 objects
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Object prefix: benchmark_data_h0.aa.journaling712.narwhal.p_64416
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sec Cur ops started finished avg MB/s cur MB/s last lat(s) avg lat(s)
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0 0 0 0 0 0 - 0
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1 16 46 30 119.949 120 0.52627 0.396166
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2 16 82 66 131.955 144 0.48087 0.427311
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3 16 123 107 142.627 164 0.3287 0.420614
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4 16 158 142 141.964 140 0.405177 0.425993
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5 16 192 176 140.766 136 0.514565 0.425175
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6 16 224 208 138.635 128 0.69184 0.436672
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7 16 261 245 139.967 148 0.459929 0.439502
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8 16 301 285 142.468 160 0.250846 0.434799
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9 16 336 320 142.189 140 0.621686 0.435457
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10 16 374 358 143.166 152 0.460593 0.436384
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