The recabling should not cause any service interruption (even though it caused some few seconds downtime for a similar recabling in eqiad but none for codfw row C).
All servers in row B are listed on https://netbox.wikimedia.org/dcim/devices/?q=&rack_group_id=12&role=server&status=1
The rack `B4` switch replacement will cause up to 30min downtime for the following servers:
https://netbox.wikimedia.org/dcim/devices/?q=&rack_group_id=12&rack_id=54&role=server&status=1
13*mw, 10*wtp, db2096, sessionstore2001
cc
@Eevans for sessionstore2001 (T209389)
@elukey for mw and wtp and "to ensure we removed any mcrouter proxies from the config"
@jcrespo for db2096
Looking at doing it Wednesday December 12th - 4pm UTC - 10am Dallas time - 3h
**1/preparations**
[x] Rack QFX [papaul]
[x] Connect console [papaul]
[x] Connect USB drive containing Junos 14.1X53-D43.7 (present in install2002:/home/ayounsi/jinstall-qfx-5-14.1X53-D43.7-domestic-signed.tgz) [papaul]
[x] Pre-populate SFP-Ts [papaul]
```
ge-4/0/0
ge-4/0/1
ge-4/0/17
ge-4/0/18
ge-4/0/19
ge-4/0/20
ge-4/0/21
ge-4/0/22
ge-4/0/23
ge-4/0/24
ge-4/0/25
ge-4/0/26
ge-4/0/27
ge-4/0/28
ge-4/0/29
ge-4/0/30
ge-4/0/31
ge-4/0/32
ge-4/0/33
ge-4/0/34
ge-4/0/35
ge-4/0/36
ge-4/0/37
ge-4/0/38
ge-4/0/39
```
[x] Upgrade and configure VCP on QFX [arzhel]
```
request system software add jinstall-qfx-5-14.1X53-D43.7-domestic-signed.tgz force-host...
request virtual-chassis mode fabric mixed local
request virtual-chassis vc-port set pic-slot 0 port 52 local
request virtual-chassis vc-port set pic-slot 0 port 53 local
request system zeroize
```
[x] Get QFX serial# (netbox)
[x] Pre run (but don't connect) VC links [papaul]
**2/ recabling**
{F27315732}
To be on the safe side:
[x] Depool site in DNS [arzhel]
[x] Redirect eqsin/ulsfo caches to eqiad [arzhel]
[] Insert uplink module to B8 (hot-insertable) [papaul]
[x] Enable all VC ports (except uplinks) on spines [arzhel]
[] Enable VC ports on fpc8 uplink module [arzhel]
[] Add: [papaul]
Links are 40G unless 10G is specified
fpc2-fpc4
fpc5-fpc7
[] Confirm working [arzhel]
[] Remove: [papaul]
fpc3:1/2-fpc4:1/0
fpc3:1/0-fpc1:1/1
fpc5:1/1-fpc6:1/0
fpc1:1/0-fpc8:1/0
fpc6:1/1-fpc8:1/1
[] Add: [papaul]
fpc1-fpc7
fpc2-fpc6
fpc2-fpc8 (2*10G)
[] Confirm working [arzhel]
[] Remove fpc8:1/2-fpc7:0/50 [papaul]
[] Add fpc8-fpc7 (with 2*10G) [papaul]
[] Add fpc3-fpc7 [papaul]
[] cleanup unused VC ports [arzhel]
**3/ FPC4 replacement**
[] Downtime hosts in Icinga [arzhel]
[] Shutdown EX [arzhel]
[] Reconfigure VCP with QFX serial# [arzhel]
`set virtual-chassis member 4 serial-number XXXX`
[] Power on QFX [papaul]
[] Connect console [papaul]
[] Move VC cables from EX to QFX (ports 52/53) [papaul]
[] Move servers' uplinks from EX to QFX [papaul]
[] verify monitoring is happy [arzhel]
[] Repool site [arzhel]
[] Update Netbox (rename old/new a4 switches, serial connection, etc) [papaul]
https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/vcf-removing.html
https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/vcf-adding-device.html
https://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/specifications/uplink-module-ex4300.html