2008-09-26
Additional charts
Host zm02.stanford.edu: Total CPU
avg(user) = 10.74 avg(sys) = 2.06 avg(idle) = 83.25 avg(iowait) = 3.74 avg(nice) = 0.00 avg(irq) = 0.01 avg(softirq) = 0.19
Host zm02.stanford.edu: Individual CPU user time
avg(cpu0) = 17.97 avg(cpu1) = 11.55 avg(cpu2) = 10.42 avg(cpu3) = 9.94 avg(cpu4) = 7.07 avg(cpu5) = 8.92 avg(cpu6) = 10.15 avg(cpu7) = 9.91
Host zm02.stanford.edu: Individual CPU nice time
avg(cpu0) = 0.00 avg(cpu1) = 0.00 avg(cpu2) = 0.00 avg(cpu3) = 0.00 avg(cpu4) = 0.00 avg(cpu5) = 0.00 avg(cpu6) = 0.00 avg(cpu7) = 0.00
Host zm02.stanford.edu: Individual CPU sys time
avg(cpu0) = 1.81 avg(cpu1) = 2.68 avg(cpu2) = 2.33 avg(cpu3) = 1.91 avg(cpu4) = 1.60 avg(cpu5) = 1.85 avg(cpu6) = 2.22 avg(cpu7) = 2.02
Host zm02.stanford.edu: Individual CPU idle time
avg(cpu0) = 76.48 avg(cpu1) = 76.83 avg(cpu2) = 79.40 avg(cpu3) = 86.96 avg(cpu4) = 90.22 avg(cpu5) = 87.99 avg(cpu6) = 81.12 avg(cpu7) = 87.03
Host zm02.stanford.edu: Individual CPU iowait time
avg(cpu0) = 2.96 avg(cpu1) = 8.71 avg(cpu2) = 7.65 avg(cpu3) = 1.09 avg(cpu4) = 1.02 avg(cpu5) = 1.17 avg(cpu6) = 6.33 avg(cpu7) = 0.96
Host zm02.stanford.edu: Individual CPU irq time
avg(cpu0) = 0.07 avg(cpu1) = 0.04 avg(cpu2) = 0.03 avg(cpu3) = 0.00 avg(cpu4) = 0.00 avg(cpu5) = 0.00 avg(cpu6) = 0.02 avg(cpu7) = 0.00
Host zm02.stanford.edu: Individual CPU softirq time
avg(cpu0) = 0.70 avg(cpu1) = 0.18 avg(cpu2) = 0.15 avg(cpu3) = 0.08 avg(cpu4) = 0.07 avg(cpu5) = 0.07 avg(cpu6) = 0.14 avg(cpu7) = 0.07
Host zm02.stanford.edu: Process CPU
avg(mailbox) = 10.10 avg(mysql) = 0.53 avg(convertd) = 0.04
Host zm02.stanford.edu: Process Total Memory
avg(mailbox) = 7322.43 avg(mysql) = 4415.90 avg(convertd) = 600.35
Host zm02.stanford.edu: Process Resident Memory
avg(mailbox) = 6945.00 avg(mysql) = 4203.58 avg(convertd) = 290.10
Host zm02.stanford.edu: Swap Activity
avg(swap in) = 0.02 avg(swap out) = 0.00
Host zm02.stanford.edu: Virtual Memory
avg(swapped) = 10.53 avg(free) = 154.59 avg(active) = 14137.22 avg(inactive) = 1208.78 avg(page cache) = 3463.98
Host zm02.stanford.edu: Context Switches
avg(context switches) = 13744.91
Host zm02.stanford.edu: Run/Blocked Process Queue Size, Load Average
avg(processes waiting for run time) = 1.22 avg(processes waiting for io time) = 0.53 avg(load average (1 min)) = 1.71
Host zm02.stanford.edu: Disk Utilization
avg(sda) = 0.15 avg(sdb) = 0.00 avg(sdc) = 0.00 avg(sdd) = 1.88 avg(sde) = 0.00 avg(sdf) = 0.00 avg(sdg) = 1.86 avg(sdh) = 2.93 avg(sdi) = 4.68 avg(sdj) = 0.00 avg(sdk) = 3.12 avg(sdl) = 4.70 avg(sdm) = 0.00 avg(sdn) = 0.00 avg(sdo) = 0.00 avg(sdp) = 1.86 avg(sdq) = 0.00 avg(sdr) = 0.00 avg(sds) = 1.88 avg(sdt) = 2.96 avg(sdu) = 4.57 avg(sdv) = 0.00 avg(sdw) = 3.07 avg(sdx) = 4.70 avg(sdy) = 0.00 avg(dm-0) = 11.34 avg(dm-1) = 18.56 avg(dm-2) = 6.35
Host zm02.stanford.edu: Disk Throughput: /dev/sda
avg(sda read) = 19.81 avg(sda write) = 41.43
Host zm02.stanford.edu: Disk Throughput: /dev/sdd
avg(sdd read) = 367.62 avg(sdd write) = 220.30
Host zm02.stanford.edu: Disk Throughput: /dev/sdg
avg(sdg read) = 362.84 avg(sdg write) = 220.39
Host zm02.stanford.edu: Disk Throughput: /dev/sdh
avg(sdh read) = 197.29 avg(sdh write) = 380.51
Host zm02.stanford.edu: Disk Throughput: /dev/sdi
avg(sdi read) = 204.73 avg(sdi write) = 47.39
Host zm02.stanford.edu: Disk Throughput: /dev/sdk
avg(sdk read) = 200.56 avg(sdk write) = 379.47
Host zm02.stanford.edu: Disk Throughput: /dev/sdl
avg(sdl read) = 207.65 avg(sdl write) = 47.53
Host zm02.stanford.edu: Disk Throughput: /dev/sdp
avg(sdp read) = 360.00 avg(sdp write) = 220.31
Host zm02.stanford.edu: Disk Throughput: /dev/sds
avg(sds read) = 364.14 avg(sds write) = 220.24
Host zm02.stanford.edu: Disk Throughput: /dev/sdt
avg(sdt read) = 203.61 avg(sdt write) = 377.52
Host zm02.stanford.edu: Disk Throughput: /dev/sdu
avg(sdu read) = 205.80 avg(sdu write) = 47.89
Host zm02.stanford.edu: Disk Throughput: /dev/sdw
avg(sdw read) = 197.30 avg(sdw write) = 378.22
Host zm02.stanford.edu: Disk Throughput: /dev/sdx
avg(sdx read) = 201.88 avg(sdx write) = 47.70
Host zm02.stanford.edu: Disk Throughput: /dev/dm-0
avg(dm-0 read) = 798.77 avg(dm-0 write) = 1515.71
Host zm02.stanford.edu: Disk Throughput: /dev/dm-1
avg(dm-1 read) = 820.05 avg(dm-1 write) = 190.51
Host zm02.stanford.edu: Disk Throughput: /dev/dm-2
avg(dm-2 read) = 1454.60 avg(dm-2 write) = 881.23
Host zm02.stanford.edu: Disk IOPs: /dev/sda
avg(sda read) = 1.09 avg(sda write) = 2.99
Host zm02.stanford.edu: Disk IOPs: /dev/sdd
avg(sdd read) = 3.32 avg(sdd write) = 1.45
Host zm02.stanford.edu: Disk IOPs: /dev/sdg
avg(sdg read) = 3.29 avg(sdg write) = 1.40
Host zm02.stanford.edu: Disk IOPs: /dev/sdh
avg(sdh read) = 7.59 avg(sdh write) = 14.06
Host zm02.stanford.edu: Disk IOPs: /dev/sdi
avg(sdi read) = 7.92 avg(sdi write) = 2.01
Host zm02.stanford.edu: Disk IOPs: /dev/sdk
avg(sdk read) = 7.65 avg(sdk write) = 14.07
Host zm02.stanford.edu: Disk IOPs: /dev/sdl
avg(sdl read) = 7.88 avg(sdl write) = 2.07
Host zm02.stanford.edu: Disk IOPs: /dev/sdp
avg(sdp read) = 3.31 avg(sdp write) = 1.45
Host zm02.stanford.edu: Disk IOPs: /dev/sds
avg(sds read) = 3.34 avg(sds write) = 1.40
Host zm02.stanford.edu: Disk IOPs: /dev/sdt
avg(sdt read) = 7.82 avg(sdt write) = 13.92
Host zm02.stanford.edu: Disk IOPs: /dev/sdu
avg(sdu read) = 7.79 avg(sdu write) = 2.09
Host zm02.stanford.edu: Disk IOPs: /dev/sdw
avg(sdw read) = 7.67 avg(sdw write) = 13.89
Host zm02.stanford.edu: Disk IOPs: /dev/sdx
avg(sdx read) = 7.84 avg(sdx write) = 2.08
Host zm02.stanford.edu: Disk IOPs: /dev/dm-0
avg(dm-0 read) = 31.12 avg(dm-0 write) = 283.59
Host zm02.stanford.edu: Disk IOPs: /dev/dm-1
avg(dm-1 read) = 32.54 avg(dm-1 write) = 47.63
Host zm02.stanford.edu: Disk IOPs: /dev/dm-2
avg(dm-2 read) = 13.58 avg(dm-2 write) = 220.31
Host zm02.stanford.edu: Disk Partition Throughput: /dev/sda1 mounted on /
avg(sda1 read) = 19.76 avg(sda1 write) = 40.63
Host zm02.stanford.edu: Disk Partition Throughput: /dev/sda2 mounted on /usr/vice/cache
avg(sda2 read) = 0.04 avg(sda2 write) = 0.80
Host zm02.stanford.edu: Disk Partition IOPs: /dev/sda1 mounted on /
avg(sda1 tps) = 11.28
Host zm02.stanford.edu: Disk Partition IOPs: /dev/sda2 mounted on /usr/vice/cache
avg(sda2 tps) = 0.21
Host zm02.stanford.edu: Total file descriptors open
avg(file descriptors open) = 6399.86
Host zm02.stanford.edu: SOAP: Invocation Count: Summary
avg(ModifyContactRequest) = 1.33 avg(GetMsgRequest) = 21.82 avg(ConvActionRequest.!read) = 1.15 avg(MsgActionRequest.read) = 1.65 avg(GetAccountRequest) = 1.25 avg(ModifyTaskRequest) = 1.50 avg(FlushCacheRequest) = 1.00 avg(FolderActionRequest.delete) = 2.14 avg(DismissCalendarItemAlarmRequest) = 1.03 avg(GetAvailableCsvFormatsRequest) = 1.00 avg(MsgActionRequest.move) = 3.45 avg(ModifyAppointmentRequest) = 1.25 avg(GetMiniCalRequest) = 4.86 avg(MsgActionRequest.tag) = 1.00 avg(ConvActionRequest.read) = 1.27 avg(FolderActionRequest.color) = 3.75 avg(ConvActionRequest.!flag) = 1.14 avg(FolderActionRequest.!check) = 1.73 avg(CheckLicenseRequest) = 1.69 avg(SearchConvRequest) = 17.14 avg(ModifyIdentityRequest) = 1.00 avg(FolderActionRequest.read) = 1.88 avg(CreateFolderRequest) = 1.08 avg(GetAvailableSkinsRequest) = 1.05 avg(FolderActionRequest.trash) = 1.00 avg(SendInviteReplyRequest) = 2.02 avg(SetAppointmentRequest) = 1.08 avg(SetTaskRequest) = 4.00 avg(RestoreRequest) = 1.00 avg(GetFolderRequest) = 43.53 avg(SearchRequest) = 25.36 avg(SendMsgRequest) = 2.74 avg(GetContactsRequest) = 4.07 avg(AutoCompleteGalRequest) = 2.71 avg(ItemActionRequest.delete) = 1.67 avg(ConvActionRequest.tag) = 1.37 avg(GetAvailableLocalesRequest) = 1.00 avg(SaveRulesRequest) = 1.12 avg(ImportAppointmentsRequest) = 1.00 avg(GetAccountInfoRequest) = 1.00 avg(DeleteAccountRequest) = 1.00 avg(ConvActionRequest.!tag) = 2.00 avg(MsgActionRequest.delete) = 5.45 avg(CreateTaskRequest) = 1.83 avg(ConvActionRequest.delete) = 1.94 avg(NoOpRequest) = 20.90 avg(SearchGalRequest) = 1.64 avg(SyncRequest) = 13.54 avg(CreateMountpointRequest) = 1.14 avg(BackupQueryRequest) = 1.00 avg(ICalReplyRequest) = 1.10 avg(ConvActionRequest.move) = 1.56 avg(ModifyPrefsRequest) = 1.00 avg(GetInfoRequest) = 6.21 avg(MsgActionRequest.trash) = 1.48 avg(ConvActionRequest.trash) = 5.45 avg(MsgActionRequest.!read) = 1.67 avg(GetFreeBusyRequest) = 1.51 avg(MsgActionRequest.!flag) = 1.14 avg(ConvActionRequest.update) = 1.00 avg(GetRulesRequest) = 1.23 avg(EndSessionRequest) = 2.38 avg(FolderActionRequest.move) = 1.20 avg(FolderActionRequest.empty) = 1.09 avg(BrowseRequest) = 1.00 avg(CancelTaskRequest) = 1.67 avg(CreateTagRequest) = 1.00 avg(DelegateAuthRequest) = 1.00 avg(SyncGalRequest) = 1.03 avg(AuthRequest) = 5.57 avg(ModifySignatureRequest) = 1.00 avg(MsgActionRequest.update) = 2.27 avg(CreateAppointmentExceptionRequest) = 1.00 avg(ConvActionRequest.spam) = 1.16 avg(GetTaskRequest) = 1.50 avg(BackupRequest) = 1.00 avg(GetAppointmentRequest) = 56.19 avg(SaveDraftRequest) = 1.83 avg(ContactActionRequest.move) = 3.67 avg(GetIdentitiesRequest) = 1.00 avg(BackupAccountQueryRequest) = 1.33 avg(ConvActionRequest.flag) = 1.16 avg(GetPermissionRequest) = 1.00 avg(CreateAppointmentRequest) = 1.19 avg(CheckSpellingRequest) = 1.12 avg(CancelAppointmentRequest) = 1.88 avg(SearchCalendarResourcesRequest) = 2.01 avg(MsgActionRequest.flag) = 1.50 avg(FolderActionRequest.check) = 1.89 avg(GetQuotaUsageRequest) = 1.00 avg(CreateContactRequest) = 1.00 avg(FolderActionRequest.rename) = 2.50 avg(AddMsgRequest) = 1.23 avg(MsgActionRequest.spam) = 1.44 avg(ItemActionRequest.move) = 1.20 avg(GetDomainInfoRequest) = 6.62
Host zm02.stanford.edu: SOAP: Average Call Duration: Summary
avg(ModifyContactRequest) = 26.83 avg(GetMsgRequest) = 239.22 avg(ConvActionRequest.!read) = 17.45 avg(MsgActionRequest.read) = 68.75 avg(GetAccountRequest) = 2.12 avg(ModifyTaskRequest) = 56.17 avg(FlushCacheRequest) = 0.00 avg(FolderActionRequest.delete) = 17.29 avg(DismissCalendarItemAlarmRequest) = 22.85 avg(GetAvailableCsvFormatsRequest) = 0.06 avg(MsgActionRequest.move) = 758.06 avg(ModifyAppointmentRequest) = 536.62 avg(GetMiniCalRequest) = 1825.57 avg(MsgActionRequest.tag) = 15.00 avg(ConvActionRequest.read) = 25.20 avg(FolderActionRequest.color) = 18.00 avg(ConvActionRequest.!flag) = 19.33 avg(FolderActionRequest.!check) = 61.85 avg(CheckLicenseRequest) = 1.10 avg(SearchConvRequest) = 154.92 avg(ModifyIdentityRequest) = 9.50 avg(FolderActionRequest.read) = 32.38 avg(CreateFolderRequest) = 17.44 avg(GetAvailableSkinsRequest) = 0.19 avg(FolderActionRequest.trash) = 13.00 avg(SendInviteReplyRequest) = 420.78 avg(SetAppointmentRequest) = 70.95 avg(SetTaskRequest) = 89.38 avg(RestoreRequest) = 716059.67 avg(GetFolderRequest) = 22.63 avg(SearchRequest) = 384.36 avg(SendMsgRequest) = 704.89 avg(GetContactsRequest) = 27.61 avg(AutoCompleteGalRequest) = 2352.88 avg(ItemActionRequest.delete) = 83.00 avg(ConvActionRequest.tag) = 15.92 avg(GetAvailableLocalesRequest) = 4.59 avg(SaveRulesRequest) = 20.12 avg(ImportAppointmentsRequest) = 4347.00 avg(GetAccountInfoRequest) = 0.25 avg(DeleteAccountRequest) = 8691.00 avg(ConvActionRequest.!tag) = 16.00 avg(MsgActionRequest.delete) = 24.04 avg(CreateTaskRequest) = 43.67 avg(ConvActionRequest.delete) = 419.78 avg(NoOpRequest) = 0.00 avg(SearchGalRequest) = 6570.67 avg(SyncRequest) = 22.57 avg(CreateMountpointRequest) = 25.86 avg(BackupQueryRequest) = 980.20 avg(ICalReplyRequest) = 154.38 avg(ConvActionRequest.move) = 20.39 avg(ModifyPrefsRequest) = 8.47 avg(GetInfoRequest) = 20.02 avg(MsgActionRequest.trash) = 17.42 avg(ConvActionRequest.trash) = 377.84 avg(MsgActionRequest.!read) = 17.13 avg(GetFreeBusyRequest) = 4752.15 avg(MsgActionRequest.!flag) = 23.29 avg(ConvActionRequest.update) = 3.00 avg(GetRulesRequest) = 0.28 avg(EndSessionRequest) = 223.07 avg(FolderActionRequest.move) = 22.20 avg(FolderActionRequest.empty) = 1713.14 avg(BrowseRequest) = 147.00 avg(CancelTaskRequest) = 100.67 avg(CreateTagRequest) = 11.50 avg(DelegateAuthRequest) = 0.25 avg(SyncGalRequest) = 251020.46 avg(AuthRequest) = 13.96 avg(ModifySignatureRequest) = 6.00 avg(MsgActionRequest.update) = 122.11 avg(CreateAppointmentExceptionRequest) = 1551.00 avg(ConvActionRequest.spam) = 22.22 avg(GetTaskRequest) = 34.50 avg(BackupRequest) = 2822.50 avg(GetAppointmentRequest) = 287.04 avg(SaveDraftRequest) = 470.45 avg(ContactActionRequest.move) = 25.33 avg(GetIdentitiesRequest) = 1.00 avg(BackupAccountQueryRequest) = 252.67 avg(ConvActionRequest.flag) = 21.69 avg(GetPermissionRequest) = 0.00 avg(CreateAppointmentRequest) = 182.38 avg(CheckSpellingRequest) = 72.31 avg(CancelAppointmentRequest) = 347.97 avg(SearchCalendarResourcesRequest) = 5.51 avg(MsgActionRequest.flag) = 15.21 avg(FolderActionRequest.check) = 238.63 avg(GetQuotaUsageRequest) = 1345.50 avg(CreateContactRequest) = 50.29 avg(FolderActionRequest.rename) = 13.00 avg(AddMsgRequest) = 497.26 avg(MsgActionRequest.spam) = 25.78 avg(ItemActionRequest.move) = 24.60 avg(GetDomainInfoRequest) = 1.51
Host zm02.stanford.edu: MySQL: InnoDB Buffer Pool Pages
avg(pages read) = 819146.54 avg(pages written) = 809054.32
Host zm02.stanford.edu: MySQL: InnoDB Buffer Pool Hit Rate
avg(buffer pool hit rate) = 999.46
Host zm02.stanford.edu: MySQL: Database Connections
avg(connection pool size) = 1.33
Host zm02.stanford.edu: MySQL: Tables Open/Opened
avg(open_tables) = 500.00 avg(opened_tables (cumulative)) = 1971.06
Host zm02.stanford.edu: MySQL: Total Slow Queries Count
avg(slow queries (cumulative)) = 3985.29
Host zm02.stanford.edu: Mailboxd: Connection Pool Get Latency
avg(mysql) = 0.35 avg(ldap) = 1.09
Host zm02.stanford.edu: Mailboxd: Dirty Lucene Index Writers
avg(dirty index writers) = 99.35
Host zm02.stanford.edu: Mailboxd: Lucene IndexWriterCache Hitrate
avg(cache hitrate) = 38.74
Host zm02.stanford.edu: Mailboxd: Lucene IO
avg(Index writes) = 4196.18 avg(Index reads) = 5402.25
Host zm02.stanford.edu: Mailboxd: LMTP Delivery Throughput
avg(received) = 80.90 avg(delivered) = 81.96
Host zm02.stanford.edu: Mailboxd: LMTP Delivery Rate
avg(received msgs) = 1.10 avg(delivered msgs) = 1.10 avg(received x rcpts) = 1.10
Host zm02.stanford.edu: Mailboxd: Mailbox Add Rate (Delivery Rate)
avg(mailbox add rate) = 1.08
Host zm02.stanford.edu: Mailboxd: Mailbox Add Latency (Delivery Speed)
avg(mailbox add latency) = 575.91
Host zm02.stanford.edu: Mailboxd: Request Rate by Client Protocol
avg(SOAP) = 3.38 avg(IMAP) = 28.14 avg(POP) = 5.96
Host zm02.stanford.edu: Mailboxd: Response Time by Client Protocol
avg(SOAP) = 263.49 avg(IMAP) = 36.15 avg(POP) = 75.58
Host zm02.stanford.edu: Mailboxd: Active Connections by Client Protocol
avg(IMAP) = 6.04 avg(IMAP SSL) = 590.81 avg(POP) = 0.01 avg(POP SSL) = 5.77
Host zm02.stanford.edu: Mailboxd: Mailbox Get Count
avg(mailbox get count) = 2274.92
Host zm02.stanford.edu: Mailboxd: Mailbox Get Latency
avg(mailbox get latency) = 0.18
Host zm02.stanford.edu: Mailboxd: Mailbox Cache Hit Rate
avg(mailbox cache hit rate) = 99.78
Host zm02.stanford.edu: Mailboxd: Mailbox Item/Blob Cache Hit Rate
avg(msg blob cache) = 3576.44 avg(item metadata cache) = 3057.07
Host zm02.stanford.edu: Mailboxd: Garbage Collection Time
avg(minor GC time) = 1.10 avg(major GC time) = 0.63
Host zm02.stanford.edu: Mailboxd: Garbage Collection Count
avg(minor GC count) = 5.09 avg(major GC count) = 0.14
Host zm02.stanford.edu: Mailboxd: JVM Heap Used
avg(total) = 3453.28 avg(PS Old Gen) = 2571.15 avg(PS Eden Space) = 791.52 avg(PS Survivor Space) = 90.61
Host zm02.stanford.edu: Mailboxd: JVM Heap Free
avg(total free) = 2662.86 avg(PS Old Gen free) = 1700.85 avg(PS Eden Space free) = 785.07 avg(PS Survivor Space free) = 176.94
Host zm02.stanford.edu: Mailboxd: JVM Permanent Generation and Code Cache
avg(PS Perm Gen) = 67.42 avg(Code Cache) = 35.91 avg(PS Perm Gen free) = 0.48 avg(Code Cache free) = 0.31
No data available for the following charts:
Host zm02.stanford.edu: Disk Throughput: /dev/sdb
Host zm02.stanford.edu: Disk Throughput: /dev/sdc
Host zm02.stanford.edu: Disk Throughput: /dev/sde
Host zm02.stanford.edu: Disk Throughput: /dev/sdf
Host zm02.stanford.edu: Disk Throughput: /dev/sdj
Host zm02.stanford.edu: Disk Throughput: /dev/sdm
Host zm02.stanford.edu: Disk Throughput: /dev/sdn
Host zm02.stanford.edu: Disk Throughput: /dev/sdo
Host zm02.stanford.edu: Disk Throughput: /dev/sdq
Host zm02.stanford.edu: Disk Throughput: /dev/sdr
Host zm02.stanford.edu: Disk Throughput: /dev/sdv
Host zm02.stanford.edu: Disk Throughput: /dev/sdy
Host zm02.stanford.edu: Disk IOPs: /dev/sdb
Host zm02.stanford.edu: Disk IOPs: /dev/sdc
Host zm02.stanford.edu: Disk IOPs: /dev/sde
Host zm02.stanford.edu: Disk IOPs: /dev/sdf
Host zm02.stanford.edu: Disk IOPs: /dev/sdj
Host zm02.stanford.edu: Disk IOPs: /dev/sdm
Host zm02.stanford.edu: Disk IOPs: /dev/sdn
Host zm02.stanford.edu: Disk IOPs: /dev/sdo
Host zm02.stanford.edu: Disk IOPs: /dev/sdq
Host zm02.stanford.edu: Disk IOPs: /dev/sdr
Host zm02.stanford.edu: Disk IOPs: /dev/sdv
Host zm02.stanford.edu: Disk IOPs: /dev/sdy