Re: Gen6 serial port different to Gen5?

pwp,



Are you using a NULL modem cable? They don’t work with Gen6 nodes.

simple 3-wire null modem cable that doesn’t support hardware flow control:

(From https://en.wikipedia.org/wiki/Null_modem)

No hardware handshaking

The simplest type of serial cable has no hardware handshaking. This cable has only the data and signal ground wires connected. All of the other pins have no connection. With this type of cable flow control has to be implemented in the software. The use of this cable is restricted to data-traffic only on its cross-connected Rx and Tx lines. This cable can also be used in devices that do not need or make use of modem control signals.

Hardware flow control was listed in the requirements for gen5 and earlier too, but somehow that cable was working with those nodes.



Full handshaking

This cable is incompatible with the previous types of cables’ hardware flow control, due to a crossing of its RTS/CTS pins. With suitable software, the cable is capable of much higher speeds than its predecessors. It also supports software flow control.

This is the one that works:

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Re: does nfs switch for –manage-gids exist

By default, the nfs client sends on the wire a list of max 16 gid’s the uid is a member of. This can be discarded and a lookup forced from the server by using –manage-gids on the nfs daemon.

An example from a VNX is

server_param server_2 -facility nfs -info manageGids

server_2 : name = manageGids

facility_name = nfs

default_value = 0

current_value = 0

configured_value =

user_action = none

change_effective = immediate

range = (0,1)

description = Rebuild the list of groups ids from the resolvers

this will presumably have an impact on response time as you are effectively throwing away the cached answer provided on the wire ( as its

potentially wrong, ie < 16 groups ) and doing a lookup of group membership from the NFS server.

Has anyone configured in such a way, and if so, can they comment on performance impact ?

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does nfs switch for –manage-gids exist

By default, the nfs client sends on the wire a list of max 16 gid’s the uid is a member of. This can be discarded and a lookup forced from the server by using –manage-gids on the nfs daemon.

An example from a VNX is

server_param server_2 -facility nfs -info manageGids

server_2 : name = manageGids

facility_name = nfs

default_value = 0

current_value = 0

configured_value =

user_action = none

change_effective = immediate

range = (0,1)

description = Rebuild the list of groups ids from the resolvers

this will presumably have an impact on response time as you are effectively throwing away the cached answer provided on the wire ( as its

potentially wrong, ie < 16 groups ) and doing a lookup of group membership from the NFS server.

Has anyone configured in such a way, and if so, can they comment on performance impact ?

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Re: Unity450FにおけるPoolの設定について

ryo8888さん、

ご覧になっている資料であればPage332の例2が参考になると思います。(Traditional Pool作成希望であるという前提)

diskGroupの選定 (/stor/config/dg show -detailにて確認)

例>spb:~> uemcli -d xx.xxx.xxx.233 -u admin -p xxx /stor/config/dg show -detail

Storage system address: xx.xxx.xxx.233

Storage system port: 443

HTTPS connection

1: ID = dg_3

Drive type= SAS Flash 2

FAST Cache = yes

Drive size = 393846128640 (366.7G)

Vendor size = 400.0G

Rotational speed = 0 rpm

Number of drives = 10

Unconfigured drives = 1

Capacity = 3938461286400 (3.5T)

Recommended number of spares = 1

Drives past EOL = 0

Drives approaching EOL = 0 (0-30 days), 0 (0-60 days), 0 (0-90 days), 0 (0-180 days)

②プロファイルの確認(/stor/config/profile show にて確認)

spa:~> uemcli -d xx.xxx.xxx.117 -u admin -p xxxx# /stor/config/profile -traditional show

1: ID = tprofile_1

Type = Traditional

Description = SAS Flash RAID5 (4+1)

Drive type = SAS Flash

RAID level = 5

Maximum capacity = 0

Stripe length = 5

Disk group =

Maximum drives to configure =

Maximum capacity to configure =

③Pool作成 (/stor/config/pool create) ①のDrive Groupから②のProfileでPoolを作成

uemcli -d xx.xxx.xxx.xxx -u admin -p XXXX /stor/config/pool

create -name <> -descr “traditional pool” -diskGroup <①> –drivesNumber <> -storProfile <②> (資料Page333参照)

④確認

uemcli -d xx.xx.xxx.xxx. /stor/config/pool show -detail

1: ID = pool_1

Type = Traditional

Name = pool1

Description =

省略

RAID level = 5

実際の検証環境で作成できるほどのDiskがなかったので切れ切れのコマンド例になってしまいすいません。

なおトラディショナルプールで作成するとのちのドライブ追加も5本単位になってしまうのでダイナミックプールでの作成のほうが

使いやすいかもしれないです。(https://community.emc.com/thread/243491

「トラディショナルPoolでは、RAID54+1)の構成でプールを作成すると、その後は最低5本からのディスクの追加が必要だったりしたのですが、ダイナミックプール環境ではパフォーマンスを損なうことなくドライブ1本ずつの追加が可能になっています」

他参考KB

521857 : Dell EMC Unity: Unable to create storage pool with available drives (Dell EMC Correctable)

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